WO2020085257A1 - 半導体装置製造方法 - Google Patents
半導体装置製造方法 Download PDFInfo
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- WO2020085257A1 WO2020085257A1 PCT/JP2019/041197 JP2019041197W WO2020085257A1 WO 2020085257 A1 WO2020085257 A1 WO 2020085257A1 JP 2019041197 W JP2019041197 W JP 2019041197W WO 2020085257 A1 WO2020085257 A1 WO 2020085257A1
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- wafer
- adhesive
- semiconductor device
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- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/33—Structure, shape, material or disposition of the layer connectors after the connecting process of a plurality of layer connectors
- H01L2224/331—Disposition
- H01L2224/3318—Disposition being disposed on at least two different sides of the body, e.g. dual array
- H01L2224/33181—On opposite sides of the body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/83001—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector involving a temporary auxiliary member not forming part of the bonding apparatus
- H01L2224/83005—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector involving a temporary auxiliary member not forming part of the bonding apparatus being a temporary or sacrificial substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/832—Applying energy for connecting
- H01L2224/83201—Compression bonding
- H01L2224/83203—Thermocompression bonding, e.g. diffusion bonding, pressure joining, thermocompression welding or solid-state welding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2225/00—Details relating to assemblies covered by the group H01L25/00 but not provided for in its subgroups
- H01L2225/03—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00
- H01L2225/04—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00 the devices not having separate containers
- H01L2225/065—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00 the devices not having separate containers the devices being of a type provided for in group H01L27/00
- H01L2225/06503—Stacked arrangements of devices
- H01L2225/06541—Conductive via connections through the device, e.g. vertical interconnects, through silicon via [TSV]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L24/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/35—Mechanical effects
- H01L2924/351—Thermal stress
- H01L2924/3511—Warping
Definitions
- the present invention relates to a method for manufacturing a semiconductor device having a laminated structure including a plurality of semiconductor elements.
- the present application claims priority based on Japanese Patent Application Nos. 2018-199011 and 2018-199012 filed on October 23, 2018, and incorporates all the contents described in the application. is there.
- the conventional WOW process proceeds as follows, for example. First, each of a plurality of semiconductor wafers having an element formation surface on which a plurality of semiconductor elements are formed through a transistor formation process, a wiring formation process, and the like and a back face opposite thereto are thinned by grinding to the back face side. Is done. Next, the back surface side of the thinned one wafer is bonded to the element formation surface side of the thick base wafer, and the thin wafer is stacked on the base wafer. Next, the thinned wafer is further laminated by joining the thinned wafer on the element formation surface side of the base wafer to the back surface side of another thinned wafer. Such further wafer stacking is performed a predetermined number of times. The wafer stack thus obtained is singulated into semiconductor devices having a structure in which a plurality of semiconductor chips are stacked, by collectively cutting a plurality of wafers in the thickness direction of the wafer stack.
- a wafer laminated body having a laminated constitution which is asymmetric in the thickness direction is formed.
- the bonding mode between the thin wafers sequentially stacked by the above-described method is the bonding between the element forming surface of the wafer that is stacked first on the base wafer and the back surface side of the wafer that is further stacked, that is, Face- It is a to-back joint.
- such joining modes are continuous in the laminating direction. That is, the formed wafer laminated body has an asymmetrical laminated structure in the thickness direction.
- a wafer laminated body having an asymmetrical laminated structure is easily warped.
- the degree of this warp tends to cumulatively increase as the total number of wafers in the wafer stack (that is, the total number of wafer-to-wafer bonds) increases.
- the warp of the wafer stacked body is not preferable in performing various processing steps on the wafer stacked body with high accuracy.
- the present invention has been devised under the circumstances as described above, and an object thereof is to provide a semiconductor device manufacturing method in which semiconductor elements are multi-layered by stacking wafers in which semiconductor elements are formed. It is an object of the present invention to provide a method suitable for efficiently forming a multilayer of thin wafers while suppressing the warp of the wafer stack.
- the semiconductor device manufacturing method provided by the present invention includes at least the following preparation step, thinning step, joining step, removing step, and multi-layering step.
- a reinforcing wafer having a laminated structure including is prepared.
- the wafer in the reinforcing wafer is ground from the back surface side to form a thinned wafer.
- the bonding step the surface of the reinforcing wafer is bonded to the surface of the other wafer having the element formation surface and the back surface opposite to the element formation surface to form a wafer stack.
- the support substrate is removed from the wafer stack.
- the surface of the wafer laminated body that has undergone the removing step is joined to the surface of another wafer laminated body to form a wafer laminated body.
- the wafer laminated body obtained through the multi-layering process is a wafer laminated body having a symmetrical laminated structure in the thickness direction.
- the wafer laminated body having a symmetrical laminated structure in the thickness direction means that a part or the whole laminated structure of the wafer laminated body is symmetrical in the thickness direction.
- Each reinforcing wafer has a laminated structure including a wafer having an element formation surface and a back surface opposite to the element formation surface, a support substrate, and a temporary adhesive layer between the element formation surface side of the wafer and the support substrate.
- the element forming surface of the wafer is a surface on which a plurality of semiconductor elements are formed through a transistor forming step, a wiring forming step, and the like.
- the temporary adhesive layer is for realizing a temporary adhesive state between the wafer and the supporting substrate, which can be released afterwards.
- the wafer in each reinforced wafer is ground and thinned from the back surface side. As a result, the thinned wafer is formed while being supported by the supporting substrate.
- each reinforcing wafer is bonded to one base wafer with an adhesive to obtain two first wafer laminated bodies.
- an adhesive is applied to one or both of the surfaces to be bonded (element forming surface of the base wafer, back surface of the thinned wafer), and the surfaces to be bonded are bonded via the adhesive, and the bonding is performed. After the bonding, the adhesive is cured. Further, in each joining step, one or both of the surfaces to be joined may be treated with a silane coupling agent before the application of the adhesive.
- the support substrate is removed from each of the first wafer stacks. Specifically, the temporary adhesion state by the temporary adhesive layer between the support substrate and the thinned wafer in each first wafer laminated body obtained through the above-described bonding process is released, and the support substrate is removed.
- the device forming surface sides of the thinned wafers in the two first wafer laminated bodies that have undergone the removing process are bonded with an adhesive (bonding by face-to-face) or the removing process.
- the back surface sides of the base wafers of the two first wafer laminated bodies that have been subjected to the above are joined together via an adhesive (back-to-back joining) to form a second wafer laminated body.
- the base wafer is adhesively bonded (bonding step), and then the support substrate is removed from the thinned wafer (removing step).
- Such a configuration is suitable for adhesively bonding a thin wafer to a thicker base wafer having higher mechanical strength while avoiding wafer breakage, thus forming a structure in which thin wafers are arranged in multiple stages.
- the element forming surface sides of the thinned wafers in the two first wafer laminated bodies that have undergone the removing step are adhesively bonded (face-to-face). Bonding), or the backsides of the base wafers are bonded to each other with an adhesive (back-to-back bonding), whereby a thin wafer can be multilayered.
- the wafer laminated body (the second wafer laminated body) thus obtained has a symmetrical laminated structure in the thickness direction.
- the element forming surfaces of all the wafers included in the second wafer laminated body have the face-to-face bonding portion side (inside).
- the back surfaces of all the wafers included in the second wafer stacked body face the back-to-back bonding location side (inner side).
- a wafer stack (second wafer stack) having such a symmetrical stacking structure in the thickness direction is less likely to warp.
- the present semiconductor device manufacturing method is suitable for multilayering a thin wafer while suppressing the warp of the wafer stack.
- This semiconductor device manufacturing method preferably further includes a step of thinning the base wafer by grinding the back surface side of the base wafer. By this step, the base wafer can be thinned to a predetermined thickness.
- a base wafer thinning step may be performed after the above-described joining step and before the removing step, may be performed between the removing step and the multi-layering step, and may be performed before the multi-layering step. You may go later.
- the configuration in which the present semiconductor device manufacturing method includes the base wafer thinning step is suitable for thinning the manufactured semiconductor device.
- This semiconductor device manufacturing method preferably comprises a step of preparing at least one additional reinforcing wafer, a thinning step for each additional reinforcing wafer, at least one additional bonding step for each additional reinforcing wafer, and an additional step. And a removing step after the joining step.
- the additional reinforcing wafer includes a wafer having an element formation surface and a back surface opposite thereto, a support substrate, and a temporary adhesive layer for forming a temporary adhesion state between the element formation surface side of the wafer and the support substrate. It has a laminated structure. In the thinning process for each additional reinforcing wafer, the wafer in such an additional reinforcing wafer is ground from the back surface side to form a thinning wafer.
- the back surface side of the thinned wafer in the additional reinforcing wafer is bonded to the element formation surface side of the thinned wafer in the first wafer stacked body with an adhesive (face-to- back joint).
- the thinned wafer in the first wafer stack is the thinned wafer bonded to the base wafer in the bonding step described above, or the thinned wafer additionally stacked on the thinned wafer in the preceding additional bonding step. It is a wafer.
- an adhesive is applied to one or both of the surfaces to be bonded (element forming surface of one thinned wafer, rear surface of the other thinned wafer), and the adhesive is applied via the adhesive.
- the surfaces to be joined are pasted together, and the adhesive is cured after the pasting.
- a silane coupling agent treatment may be applied to one or both of the joining target surfaces before the application of the adhesive.
- This semiconductor device manufacturing method preferably further includes a step of forming a through electrode extending through the plurality of thinned wafers and at least one base wafer in the second wafer stacked body after the above-mentioned multilayering step. Including.
- the element of the base wafer located at the other end from the element forming surface of the thinned wafer located at one end in the stacking direction of each first wafer stack is prior to the above-described multilayering step.
- the method may include a step of forming a through electrode that extends through the first wafer stacked body up to the formation surface. According to these configurations, in the manufactured semiconductor device, the semiconductor elements can be appropriately electrically connected within a short distance. Therefore, the structure is suitable for realizing efficient digital signal processing in a manufactured semiconductor device, is suitable for suppressing attenuation of a high-frequency signal, and is also suitable for suppressing power consumption. It is suitable.
- Each of the adhesive used in the bonding step and the adhesive used in the additional bonding step is preferably a polyorganosilsesquioxane containing a polymerizable group (that is, a polyorganosilsesquioxy group having a polymerizable functional group). Sun) is included.
- the polymerizable group-containing polyorganosilsesquioxane is suitable for achieving a relatively low polymerization temperature or curing temperature of, for example, about 30 to 200 ° C. and also for achieving high heat resistance after curing.
- the adhesive bonding between wafers by the adhesive containing the polymerizable group-containing polyorganosilsesquioxane realizes high heat resistance in the adhesive layer formed between the wafers, and the curing temperature for forming the adhesive layer. Is suitable for suppressing damage to the elements in the wafer as the adherend by reducing
- the temporary adhesive for forming the temporary adhesive layer in the reinforced wafer preferably has a polyvalent vinyl ether compound and two or more hydroxy groups or carboxy groups capable of reacting with the vinyl ether group to form an acetal bond. And a compound capable of forming a polymer with the polyvalent vinyl ether compound, and a thermoplastic resin. That is, it is preferable that the temporary adhesive layer in the reinforcing wafer is formed by solidifying the above-mentioned polymer in the temporary adhesive interposed between the wafer and the supporting substrate.
- the temporary adhesive having such a structure in the form of a temporary adhesive layer that is cured and formed between the support substrate and the wafer, while securing a high adhesive force that can withstand grinding or the like in the thinning process for the wafer, for example, it is suitable for realizing a relatively high softening temperature of about 130 to 250 ° C.
- the temporary adhesive layer in the reinforced wafer used for the bonding process or the additional bonding process has the above composition suitable for achieving a relatively high softening temperature, and the adhesive used in the process is relatively
- a polymerizable group-containing polyorganosilsesquioxane-containing adhesive that is suitable for achieving a low curing temperature and high heat resistance after curing
- such a composite structure has a bonding step and each additional step. It is suitable for achieving both the joining process and the subsequent removing process.
- the composite structure is configured such that the bonding process and the additional bonding process are performed at a relatively low temperature condition to maintain the temporary bonding state between the supporting substrate and the thinned wafer on the reinforcing wafer while maintaining the other wafers on the thinned wafer. It is suitable for realizing good adhesive bonding to (the base wafer in the bonding process and the other thinned wafer which is one component of the first wafer stack in the additional bonding process), and the subsequent removal process is relatively easy. It is suitable to perform under high temperature conditions to soften the temporary adhesive layer while maintaining the adhesive bond between the thinned wafer and another wafer to remove the supporting substrate from the thinned wafer.
- the structure in which the temporary adhesive layer is released from the temporary adhesive state through the softening of the temporary adhesive layer prevents the strong stress from acting locally on the thinned wafer. It is suitable for avoiding or suppressing the damage of the wafer.
- the above-mentioned joining step includes a hardening treatment for hardening the adhesive at a temperature lower than the softening point of the polymer in the temporary adhesive layer, and the removing step after the joining step. Includes a softening treatment for softening the temporary adhesive layer at a temperature higher than the softening point of the polymer in the temporary adhesive layer.
- the additional bonding step described above includes a curing treatment for curing the adhesive at a temperature lower than the softening point of the polymer in the temporary adhesive layer, and the additional bonding step.
- the removal step after the joining step includes a softening treatment for softening the temporary adhesive layer at a temperature higher than the softening point of the polymer in the temporary adhesive layer.
- each of the reinforcing wafers has a wafer having an element formation surface and a back surface opposite thereto, a support substrate, and a temporary adhesive layer for forming a temporary adhesion state between the element formation surface side of the wafer and the support substrate, It has a laminated structure including.
- the element forming surface of the wafer is a surface on which a plurality of semiconductor elements are formed through a transistor forming step and, if necessary, a wiring forming step. In the thinning step, the back surface side of each reinforcing wafer is ground to thin the wafer.
- the back surface sides of the two reinforcing wafers that have undergone the thinning step are bonded to each other by, for example, an adhesive layer or by direct bonding, so that at least two wafer bilayers with a supporting substrate are formed. That is, a required number of 2 or more) is formed.
- the removing step at least one support substrate is removed from each wafer bilayer.
- the multi-layering process at least two (that is, a desired number of two or more) wafer bilayers are exposed to each other on the element formation surface sides of the wafers after the removal process, for example, by an adhesive layer or by direct bonding. Bonding to form a multi-wafer stack.
- the bonding step of the present semiconductor device manufacturing method as described above, the back surface sides of the wafers in the two reinforcing wafers that have undergone the thinning step are bonded (back-to-back bonding), and the wafer bilayer body is formed. It is formed. That is, the two-layered wafer formed in the bonding step has a laminated structure in which the back surfaces of the wafers are bonded to each other and are symmetrical in the thickness direction.
- the two-layered wafer body (wafer stacked body) having a symmetrical laminated structure in the thickness direction is less likely to warp.
- the element formation surface sides of the wafers exposed through the removing step in the desired number of two or more wafer bilayers are joined (face-to-face). Bonding), a wafer multi-layered body having four or more stacked wafers is formed.
- the formed multi-layered wafer has a symmetrical laminated structure in which the element forming surface sides exposed in the two-layered wafer are joined to each other and are symmetrical in the thickness direction.
- the wafer multi-layered body formed in the multi-layering step includes two supporting substrates and four thinned wafers interposed between the substrates, and one face-to-face joint between two Back-to-Back joints in the stack thickness direction. Are located, which are symmetrical in the thickness direction.
- a wafer multi-layer body (wafer layered body) having a layered structure symmetrical in the thickness direction is less likely to warp.
- the present semiconductor device manufacturing method is suitable for manufacturing a semiconductor device while suppressing the warp of the wafer stack (two-wafer stack, multi-wafer stack).
- the thinning step of thinning the wafer to be laminated by grinding the back surface side of the wafer is performed.
- the wafer is thinned while being bonded to the supporting substrate via the temporary adhesive layer. Attached to the process.
- the back surface sides of the thin wafers of the two reinforcing wafers that have undergone such a thinning step are bonded together to form a two-layered wafer.
- the present semiconductor device manufacturing method including such a configuration is suitable for forming a thin wafer into multiple layers.
- the present semiconductor device manufacturing method is suitable for multilayering thin wafers while suppressing the warp of the wafer stack.
- the present semiconductor device manufacturing method further includes a step of removing the support substrate located at one end in the stacking direction of the multi-layered wafer (removing step after the multi-layering step) after the multi-layering step.
- a step of removing the support substrate located at one end in the stacking direction of the multi-layered wafer removing step after the multi-layering step
- Such a configuration in which the temporary adhesion state with a predetermined wafer is released after the multi-layering process and the supporting substrate is removed is preferable from the viewpoint of handling the thin wafer after the thinning process.
- This semiconductor device manufacturing method is preferably a method of forming a wafer bilayer on the exposed element formation surface side of a wafer located at one end in the stacking direction of a wafer multi-layered body that has undergone a multilayering process or a subsequent removing process.
- the method further includes an additional multilayering step of joining the element formation surface side of the wafer exposed through the removing step.
- Such a configuration is suitable in order to further increase the number of wafers in the wafer multi-layered structure.
- the semiconductor device manufacturing method preferably further includes a step of forming a through electrode in the wafer multi-stack structure.
- the through electrode formed in this step penetrates through the wafer multi-layer stack from the element formation surface of the wafer located at one end in the stacking direction of the wafer multi-stack to the element formation surface of the wafer located at the other end. It extends.
- the semiconductor elements can be appropriately electrically connected in a short distance. Therefore, the structure is suitable for realizing efficient digital signal processing in a manufactured semiconductor device, is suitable for suppressing attenuation of a high-frequency signal, and is also suitable for suppressing power consumption. It is suitable.
- the bonding between the back surfaces in the bonding step is performed by using a polymerizable group-containing polyorganosilsesquioxane (that is, a polyorganosilsesquiox having a polymerizable functional group) as a thermosetting resin.
- a polymerizable group-containing polyorganosilsesquioxane that is, a polyorganosilsesquiox having a polymerizable functional group
- the bonding between the element forming surfaces in the multilayering step is performed by using a polymerizable group-containing polyorganosilsesquioxane (that is, a polyorgano having a polymerizable functional group) as a thermosetting resin. Silsesquioxane).
- a polymerizable group-containing polyorganosilsesquioxane that is, a polyorgano having a polymerizable functional group
- Silsesquioxane silane coupling agent treatment may be performed on one or both of the two element formation surfaces, which are the bonding target surfaces, before the application of the adhesive.
- Adhesive bonding as described above between the wafers in the bonding process and the multi-layering process is preferable from the viewpoint that the flatness required for the bonding surface of the wafer is low as compared with the direct bonding.
- direct bonding for example, a high level of flatness on the order of nanometers is required for the wafer bonding surface.
- the formed adhesive layer can exert a function of substantially absorbing and reducing / eliminating deviation from the ideal plane of the wafer bonding surface and inclination, so that the direct bonding is performed.
- the requirement for the flatness of the wafer bonding surface is relaxed in comparison with.
- Such a configuration is preferable from the viewpoint of easiness of manufacturing a semiconductor device manufactured through multi-layering of thin wafers, and further from the viewpoint of improving the yield of manufacturing a semiconductor device.
- the above-described inter-wafer adhesive bonding by the polymerizable group-containing polyorganosilsesquioxane-containing adhesive realizes high heat resistance in the adhesive layer to be formed, It is suitable for lowering the curing temperature for forming the agent layer and suppressing damage to the elements in the wafer as the adherend.
- the bonding is performed at a temperature of room temperature or higher and 80 ° C. or lower, and the adhesive is cured at a temperature of 30 to 200 ° C. after the bonding.
- Such a configuration is suitable for suppressing the dimensional change of the adhesive agent interposed between the wafers at the time of bonding, and is intended to reduce the curing temperature for forming the adhesive agent layer, and thus the element in the wafer to be adhered. Also suitable for suppressing damage to the.
- FIG. 3 shows some steps in the method for manufacturing a semiconductor device according to one embodiment of the first aspect of the present invention.
- 3 shows some steps in the method for manufacturing a semiconductor device according to one embodiment of the first aspect of the present invention.
- 3 shows some steps in the method for manufacturing a semiconductor device according to one embodiment of the first aspect of the present invention.
- 3 shows some steps in the method for manufacturing a semiconductor device according to one embodiment of the first aspect of the present invention.
- 3 shows some steps in the method for manufacturing a semiconductor device according to one embodiment of the first aspect of the present invention.
- 3 shows some steps in the method for manufacturing a semiconductor device according to one embodiment of the first aspect of the present invention.
- FIG. 10 shows some steps in the method for manufacturing a semiconductor device according to another embodiment of the first aspect of the present invention.
- FIG. 10 shows some steps in the method for manufacturing a semiconductor device according to another embodiment of the first aspect of the present invention.
- FIG. 10 shows some steps in the method for manufacturing a semiconductor device according to another embodiment of the first aspect of the present invention.
- FIG. 10 shows some steps in the method for manufacturing a semiconductor device according to another embodiment of the first aspect of the present invention.
- FIG. 10 shows some steps in the method for manufacturing a semiconductor device according to another embodiment of the first aspect of the present invention.
- FIG. 10 shows some steps in the method for manufacturing a semiconductor device according to another embodiment of the first aspect of the present invention.
- FIG. 10 shows some steps in the method for manufacturing a semiconductor device according to still another embodiment of the first aspect of the present invention.
- FIG. 10 shows some steps in the method for manufacturing a semiconductor device according to another embodiment of the first aspect of the present invention.
- FIG. 10 shows some steps in the method for manufacturing a semiconductor device according to still another embodiment of the first aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIG. 6 shows a part of the steps in the method for manufacturing a semiconductor device according to the embodiment of the second aspect of the present invention.
- FIGS. 1 to 6 show a semiconductor device manufacturing method according to an embodiment of the first aspect of the present invention.
- This manufacturing method is a method for manufacturing a semiconductor device having a three-dimensional structure in which semiconductor elements are integrated in the thickness direction, and FIGS. 1 to 6 are partial cross-sectional views showing the manufacturing process.
- each reinforcing wafer 1R has a laminated structure including a wafer 1, a support substrate S, and a temporary adhesive layer 2 between them.
- the wafer 1 is a wafer having a semiconductor wafer body into which semiconductor elements can be formed, and has an element forming surface 1a and a back surface 1b opposite thereto.
- the element formation surface of the wafer is a surface on the side where a plurality of semiconductor elements (not shown) are formed in the wafer through the transistor formation process.
- Each semiconductor element of the wafer 1 has, for example, a multilayer wiring structure portion including exposed electrode pads on its surface.
- the wafer 1 has various semiconductor elements already formed on the element forming surface 1a side, and the wiring structure required for the semiconductor element is formed later on the element forming surface 1a. May be.
- constituent materials for forming the semiconductor wafer body of the wafer 1 include silicon (Si), germanium (Ge), silicon carbide (SiC), gallium arsenide (GaAs), gallium nitride (GaN), and indium phosphide (InP). ) Is mentioned.
- the thickness of such a wafer 1 is preferably 1000 ⁇ m or less, more preferably 900 ⁇ m or less, and still more preferably 800 ⁇ m or less from the viewpoint of shortening the grinding time in the grinding process described later.
- the thickness of the wafer 1 is, for example, 500 ⁇ m or more.
- the supporting substrate S in the reinforcing wafer 1R is for reinforcing the wafer 1 which becomes thin through the thinning process described below.
- the support substrate S include a silicon wafer and a glass wafer.
- the thickness of the support substrate S is preferably 300 ⁇ m or more, more preferably 500 ⁇ m or more, and more preferably 700 ⁇ m or more from the viewpoint of ensuring the function as a reinforcing element.
- the thickness of the support substrate S is, for example, 800 ⁇ m or less.
- Such a supporting substrate S is bonded to the element forming surface 1a side of the wafer 1 via a temporary adhesive layer 2.
- the temporary adhesive layer 2 is for realizing a temporary adhesive state between the wafer 1 and the supporting substrate S that can be released afterwards.
- the temporary adhesive for forming such a temporary adhesive layer 2 is a polyvalent vinyl ether compound (A) and a hydroxy group or a carboxy group capable of reacting with the vinyl ether group to form an acetal bond.
- a temporary adhesive for forming the temporary adhesive layer 2 instead of such a temporary adhesive, a silicone adhesive, an acrylic adhesive, or a wax type adhesive may be adopted.
- the reinforced wafer 1R having such a configuration can be manufactured, for example, through the following steps.
- the temporary adhesive layer 2 is formed on the support substrate S.
- a temporary adhesive for forming the temporary adhesive layer 2 is applied onto the supporting substrate S by, for example, spin coating to form a temporary adhesive coating film, and the coating film is dried by heating to perform temporary adhesion.
- the agent layer 2 can be formed.
- the heating temperature is, for example, 100 to 300 ° C. and may be constant or may be changed stepwise.
- the heating time is, for example, 30 seconds to 30 minutes.
- FIGS. 2B and 2C the support substrate S and the wafer 1 are bonded to each other via the temporary adhesive layer 2.
- the wafer 1 has the element forming surface 1a and the back surface 1b opposite thereto, as described above.
- the support substrate S and the wafer 1 are bonded together while being pressed via the temporary adhesive layer 2, and then heated to form a polymer having a softening point in a high temperature range to form a temporary adhesive.
- the layer 2 is solidified, and the supporting substrate S and the wafer 1 are adhered to each other by the temporary adhesive layer 2.
- the applied pressure is, for example, 300 to 5000 g / cm 2
- the temperature is, for example, 30 to 200 ° C.
- the heating temperature is, for example, 100 to 300 ° C., preferably 100 to 250 ° C.
- the heating time is, for example, 30 seconds to 30 minutes, preferably 3 to 12 minutes. It's a minute.
- the heating temperature may be constant or may be changed stepwise.
- the reinforcing wafer 1R having a laminated structure including the wafer 1, the supporting substrate S, and the temporary adhesive layer 2 between them can be manufactured.
- the above-mentioned polyvalent vinyl ether compound (A) in the temporary adhesive is a compound having two or more vinyl ether groups in the molecule and is represented by, for example, the following formula (a).
- Z 1 is a saturated or unsaturated aliphatic hydrocarbon, a saturated or unsaturated alicyclic hydrocarbon, an aromatic hydrocarbon, a heterocyclic compound, or these are bonded via a single bond or a linking group. It represents a group obtained by removing n 1 hydrogen atoms from the structural formula of a bonded conjugate. Further, in the formula (a), n 1 represents an integer of 2 or more, for example, an integer of 2 to 5, preferably an integer of 2 to 3.
- the groups obtained by removing 2 hydrogen atoms from the structural formula of saturated or unsaturated aliphatic hydrocarbon include For example, a linear or branched alkylene group such as methylene group, ethylene group, propylene group, trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group, octamethylene group, decamethylene group, and dodecamethylene group, and Examples thereof include linear or branched alkenylene groups such as a vinylene group, a 1-propenylene group, and a 3-methyl-2-butenylene group.
- a linear or branched alkylene group such as methylene group, ethylene group, propylene group, trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group, octamethylene group, decamethylene group, and dodecamethylene group
- Examples thereof include linear or branched alkenylene groups such as a vinylene group, a 1-propenylene group,
- the alkylene group has, for example, 1 to 20 carbon atoms, and preferably 1 to 10 carbon atoms.
- the alkenylene group has, for example, 2 to 20 carbon atoms, and preferably 2 to 10 carbon atoms.
- Examples of the group obtained by removing three or more hydrogen atoms from the structural formula of a saturated or unsaturated aliphatic hydrocarbon include a group obtained by further removing one or more hydrogen atoms from the structural formulas of these exemplified groups. it can.
- the groups obtained by removing n 1 hydrogen atoms from the structural formula of the saturated or unsaturated alicyclic hydrocarbon as the groups obtained by removing 2 hydrogen atoms from the structural formula of the saturated or unsaturated alicyclic hydrocarbon.
- Examples of the group obtained by removing three or more hydrogen atoms from the structural formula of a saturated or unsaturated alicyclic hydrocarbon include a group obtained by removing one or more hydrogen atoms from the structural formulas of these exemplified groups. You can
- aromatic hydrocarbon examples include benzene, naphthalene, and anthracene.
- the heterocyclic compound includes an aromatic heterocyclic compound and a non-aromatic heterocyclic compound.
- a heterocyclic compound include heterocyclic compounds containing an oxygen atom as a hetero atom (for example, 5-membered ring such as furan, tetrahydrofuran, oxazole, isoxazole, and ⁇ -butyrolactone, 4-oxo-4H- 6-membered rings such as pyran, tetrahydropyran, and morpholine, condensed rings such as benzofuran, isobenzofuran, 4-oxo-4H-chromene, chroman, and isochroman, and 3-oxatricyclo [4.3.1.1 4, 8 ] undecan-2-one and 3-oxatricyclo [4.2.1.0 4,8 ] nonan-2-one and other bridged rings), heterocyclic compounds containing sulfur atoms as heteroatoms (eg, 5-membered ring such as thiophene, thiazole, is
- linking group examples include a divalent to tetravalent hydrocarbon group, a carbonyl group (—CO—), an ether bond (—O—), a sulfide bond (—S—), an ester bond (—COO—), and an amide.
- a bond (-CONH-), a carbonate bond (-OCOO-), a urethane bond (-NHCOO-), a -NR- bond (R represents a hydrogen atom, an alkyl group, or an acyl group), and a plurality of these linked.
- the groups mentioned above can be mentioned.
- examples of the divalent hydrocarbon group include linear or branched chains such as methylene group, methylmethylene group, dimethylmethylene group, ethylene group, propylene group, and trimethylene group.
- Examples of the trivalent hydrocarbon group include groups obtained by further removing one hydrogen atom from the structural formula of the divalent hydrocarbon group.
- Examples of the tetravalent hydrocarbon group include groups obtained by further removing two hydrogen atoms from the structural formula of the above divalent hydrocarbon group.
- Z 1 may have one type or two or more types of substituents.
- substituents include an alkyl group, cycloalkyl group, alkenyl group, cycloalkenyl group, aryl group, hydroxy group, carboxy group, nitro group, amino group, mercapto group, halogen atom, and C substituted with a halogen atom.
- substituents include an alkyl group, cycloalkyl group, alkenyl group, cycloalkenyl group, aryl group, hydroxy group, carboxy group, nitro group, amino group, mercapto group, halogen atom, and C substituted with a halogen atom.
- examples thereof include a 2-10 hydrocarbon group, a hydrocarbon group containing a functional group containing a hetero atom (such as oxygen and sulfur), and a group in which two or more of these groups are bonded.
- alkyl group include C 1-4 alkyl groups such as methyl group and ethy
- Examples of the cycloalkyl group include a C 3-10 cycloalkyl group.
- Examples of the alkenyl group include C 2-10 alkenyl groups such as vinyl group.
- Examples of the cycloalkenyl group include a C 3-10 cycloalkenyl group.
- Examples of the aryl group include C 6-15 aryl groups such as a phenyl group and a naphthyl group.
- Examples of the hydrocarbon group containing a hetero atom-containing functional group include a C 1-4 alkoxy group and a C 2-6 acyloxy group.
- polyvalent vinyl ether compound (A) examples include, for example, 1,4-butanediol divinyl ether, diethylene glycol divinyl ether, triethylene glycol divinyl ether, and the following formulas (a-1) to (a-21). The compound represented by these can be mentioned.
- Z 1 in the polyvalent vinyl ether compound (A) forms a polymer having a high softening point in the above-mentioned temporary adhesive, it is preferably a saturated or unsaturated aliphatic hydrocarbon, or a plurality of such carbonizations.
- Hydrogen is a group in which n 1 hydrogen atoms have been removed from the structural formula of a bond in which a hydrogen atom is bonded via a linking group, more preferably a saturated aliphatic hydrocarbon or a plurality of such hydrocarbons via a linking group.
- the polyvalent vinyl ether compound (A) is most preferably at least one compound selected from the group consisting of 1,4-butanediol divinyl ether, diethylene glycol divinyl ether, and triethylene glycol divinyl ether.
- the compound (B) in the temporary adhesive has a polyvalent group having two or more hydroxy groups or carboxy groups capable of reacting with the vinyl ether group of the polyvalent vinyl ether compound (A) to form an acetal bond.
- X represents a hydroxy group or a carboxy group.
- the n 2 Xs may be the same or different from each other.
- n 2 represents an integer of 1 or more.
- N 2 is preferably from the standpoint of availability in preparation of the above-mentioned temporary adhesive and ease of dissolution in a solvent, and from the viewpoint of forming a polymer having a high softening point in the temporary adhesive. It is an integer of 1 to 3, and more preferably an integer of 1 to 2.
- the number of constitutional units (repeating units) represented by the above formula (b) in the compound (B) is 2 or more, and from the viewpoint of forming a polymer having a high softening point in the above-mentioned temporary adhesive, it is preferable. It is an integer of 2 to 40, more preferably an integer of 10 to 30.
- Z 2 is a saturated or unsaturated aliphatic hydrocarbon, a saturated or unsaturated alicyclic hydrocarbon, an aromatic hydrocarbon, a heterocyclic compound, or these are bonded via a single bond or a linking group.
- the compound (B) is preferably a styrene polymer, a (meth) acrylic polymer, polyvinyl alcohol, a novolac resin, and a resole resin, and more preferably from the following formulas (b-1) to (b-6) It is a compound having two or more at least one structural unit (repeating unit) selected from the group consisting of:
- the proportion of the structural unit represented by the formula (b) in the total amount of the compound (B) is preferably 30% by mass or more, It is more preferably 50% by mass or more, and even more preferably 60% by mass or more.
- the ratio of the structural unit represented by the formula (b) in the total amount of the compound (B) is preferably 30 mol% or more, more preferably 50 mol% or more.
- the proportion of the structural unit represented by the formula (b) in the total amount of the compound (B) is preferably 1% by mass or more, It is more preferably 5% by mass or more, and even more preferably 10% by mass or more.
- the proportion of the constitutional unit represented by the formula (b) being within the above range is suitable for securing a sufficient distance between crosslinking points and a sufficient number of crosslinking points in the compound (B), and therefore,
- the above-mentioned temporary adhesive is suitable for ensuring a weight average molecular weight and a high softening point of a polymer obtained by polymerizing the compound (B) with the above-mentioned polyvalent vinyl ether compound (A).
- the temporary adhesive layer 2 formed of an adhesive is suitable for ensuring high adhesiveness holding property in a high temperature environment.
- the compound (B) may be a homopolymer having only the constitutional unit represented by the formula (b), or a copolymer having the constitutional unit represented by the formula (b) and another constitutional unit. May be When the compound (B) is a copolymer, it may be any of a block copolymer, a graft copolymer and a random copolymer.
- the above-mentioned other structural unit in the compound (B) is a structural unit derived from a polymerizable monomer having neither a hydroxy group nor a carboxy group, and examples of the polymerizable monomer include olefins and aromatic vinyl compounds. , Unsaturated carboxylic acid esters, carboxylic acid vinyl esters, and unsaturated dicarboxylic acid diesters.
- olefin examples include chain olefins such as ethylene, propylene, and 1-butene (particularly C 2-12 alkenes), cyclopentene, cyclohexene, cycloheptene, norbornene, 5-methyl-2-norbornene, and tetracyclododecene. And other cyclic olefins (especially C 3-10 cycloalkenes).
- aromatic vinyl compound examples include styrene, vinyltoluene, ⁇ -methylstyrene, 1-propenylbenzene, 1-vinylnaphthalene, 2-vinylnaphthalene, 3-vinylpyridine, 3-vinylfuran, 3-vinylthiophene, Mention may be made of C 6-14 aromatic vinyl compounds such as 3-vinylquinoline, indene, methylindene, ethylindene, and dimethylindene.
- Examples of the unsaturated carboxylic acid ester include ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and dicyclopentanyl (meth) acrylate.
- R ′′ is a saturated or unsaturated aliphatic hydrocarbon, a saturated or unsaturated aliphatic hydrocarbon, It represents a group in which one hydrogen atom is removed from the structural formula of an unsaturated alicyclic hydrocarbon, aromatic hydrocarbon, heterocyclic compound, or a bonded product of these bonded through a single bond or a linking group.
- R for example, a monovalent group corresponding to the divalent group mentioned for Z 1 in the above formula (a)).
- carboxylic acid vinyl ester for example , Vinyl acetate, vinyl propionate, vinyl caprylate, and caproic acid C 1-16 fatty acid vinyl esters such as vinyl and the like.
- unsaturated dicarboxylic acid diester for example, diethyl maleate, dibutyl maleate, dioctyl maleate, Mention may be made of maleic acid di-C 1-10 alkyl esters such as 2-ethylhexyl maleic acid and corresponding fumaric acid diesters, which may be used alone or in combination of two or more. can do.
- the compound (B) is a copolymer
- the structural unit represented by the above formula (b) a chain olefin, a cyclic olefin, an aromatic vinyl compound, an unsaturated carboxylic acid ester, a carboxylic acid vinyl ester, And a structural unit derived from at least one polymerizable monomer selected from the group consisting of unsaturated dicarboxylic acid diesters are preferred.
- the softening point (T 1 ) of the compound (B) is, for example, 50 ° C. or higher, preferably 80 ° C. or higher, more preferably 100 ° C. or higher.
- Such a configuration is suitable for realizing a high softening point of a polymer obtained by polymerizing the compound (B) and the polyvalent vinyl ether compound (A).
- T 1 is, for example, 250 ° C. or lower, preferably 200 ° C. or lower, more preferably 150 ° C. or lower is there.
- T 1 can be adjusted, for example, by controlling the weight average molecular weight of the compound (B) (polystyrene conversion value by GPC method).
- the weight average molecular weight of the compound (B) is, for example, 1500 or more, preferably 1800 to 10000, more preferably 2000 to 5000.
- thermoplastic resin (C) in the temporary adhesive is a compound having thermoplasticity and capable of imparting flexibility to the adhesive composition when blended into the adhesive composition.
- a thermoplastic resin (C) include polyvinyl acetal resin, polyester resin, polyurethane resin, polyamide resin, poly (thio) ether resin, polycarbonate resin, polysulfone resin, and polyimide resin.
- polycondensation resins such as resins, polyolefin resins, (meth) acrylic resins, styrene resins, vinyl polymerization resins such as vinyl resins, and resins derived from natural products such as cellulose derivatives. These can be used individually by 1 type or in combination of 2 or more types.
- thermoplastic resin (C) is suitable for imparting flexibility and flexibility to the temporary adhesive layer 2 to be formed, and the temperature is rapidly increased. It is suitable for preventing spontaneous peeling and the occurrence of cracks even under an environment where the temperature changes, and is suitable for ensuring excellent adhesiveness.
- the thermoplastic resin (C) in the temporary adhesive is preferably at least one selected from the group consisting of polyvinyl acetal resin, polyester resin, polyurethane resin, and polyamide resin.
- the temporary adhesive or the temporary adhesive layer 2 there is a case in which flexibility is easily imparted, or a chemical interaction with an adherend such as a wafer is weakened and adhesive residue is left on the adherend after peeling.
- the temporary adhesive preferably contains a polyester resin as the thermoplastic resin (C).
- the temporary adhesive in addition to the viewpoint that flexibility is easily imparted and the adhesive residue on the adherend is easily removed, high adhesion to the adherend is secured. From the viewpoint of that, the temporary adhesive preferably contains both the polyester resin and the polyvinyl acetal resin as the thermoplastic resin (C).
- polyvinyl acetal resin examples include resins having at least a constitutional unit represented by the following formula, which is obtained by reacting polyvinyl alcohol with aldehyde (RCHO).
- RCHO aldehyde
- R in the structural formula is a hydrogen atom, a linear C 1-5 alkyl group, a branched C 2-5 alkyl group, or C
- the compound which is a 6-10 aryl group may be mentioned, and specific examples thereof include formaldehyde, butyraldehyde, and benzaldehyde.
- Such a polyvinyl acetal-based resin may have another structural unit other than the structural unit represented by the following formula.
- the polyvinyl acetal-based resin includes homopolymers and copolymers.
- Specific examples of such a polyvinyl acetal-based resin include polyvinyl formal and polyvinyl butyral. Commercially available products) can be used.
- polyester resin examples include polyesters obtained by polycondensation of a diol component and a dicarboxylic acid component.
- diol component examples include aliphatic C 2-12 diol such as ethylene glycol, polyoxy C 2-4 alkylene glycol such as diethylene glycol, alicyclic C 5-15 diol such as cyclohexanedimethanol, and aromatic C 6 such as bisphenol A. -20 diols.
- dicarboxylic acid component examples include aromatic C 8-20 dicarboxylic acids such as terephthalic acid, aliphatic C 2-40 dicarboxylic acids such as adipic acid, and alicyclic C 8-15 dicarboxylic acids such as cyclohexanedicarboxylic acid.
- polyester-based resin also include polyesters obtained by polycondensation of oxycarboxylic acid.
- oxycarboxylic acid include aliphatic C 2-6 oxycarboxylic acid such as lactic acid and aromatic C 7-19 oxycarboxylic acid such as hydroxybenzoic acid.
- polyester-based resin also include polyesters obtained by ring-opening polymerization of lactone.
- polyester-based resin examples include polyesters containing a urethane bond obtained by the reaction of polyester diol and diisocyanate. Polyester resins include homopolyesters and copolyesters. Further, as the polyester-based resin, for example, a commercially available product having a trade name “Placcel H1P” (manufactured by Daicel Corporation) can be used.
- polyurethane-based resin examples include resins obtained by reacting diisocyanates, polyols and a chain extender used as necessary.
- diisocyanates include aliphatic diisocyanates such as hexamethylene diisocyanate, alicyclic diisocyanates such as isophorone diisocyanate, and aromatic diisocyanates such as tolylene diisocyanate.
- Polyols include polyester diols, polyether diols, and polycarbonate diols.
- chain extender examples include C 2-10 alkylenediol such as ethylene glycol, aliphatic diamine such as ethylenediamine, alicyclic diamine such as isophoronediamine, and aromatic diamine such as phenylenediamine.
- polyamide-based resin examples include, for example, a polyamide obtained by polycondensation of a diamine component and a dicarboxylic acid component, a polyamide obtained by polycondensation of an aminocarboxylic acid, a polyamide obtained by ring-opening polymerization of lactam, and a diamine component.
- a polyester amide obtained by polycondensation of a dicarboxylic acid component and a diol component can be mentioned.
- the diamine component examples include C 4-10 alkylenediamine such as hexamethylenediamine.
- dicarboxylic acid component examples include C 4-20 alkylenedicarboxylic acid such as adipic acid.
- the aminocarboxylic acid examples include C 4-20 aminocarboxylic acid such as ⁇ -aminoundecanoic acid.
- lactam examples include C 4-20 lactam such as ⁇ -laurolactam.
- diol component examples include C 2-12 alkylene diol such as ethylene glycol.
- the polyamide resin includes homopolyamide and copolyamide.
- the softening point (T 2 ) of the thermoplastic resin (C) is the thermosetting temperature of the permanent adhesive described below, which is used in combination with the temporary adhesive containing the thermoplastic resin (C) in the semiconductor device manufacturing method according to the present invention. It is preferably higher by 10 ° C. or more.
- the difference between the thermosetting temperature and T 2 of the permanent adhesive is, for example, 10 to 40 ° C, preferably 20 to 30 ° C.
- T 2 can be adjusted, for example, by controlling the weight average molecular weight (Mw: polystyrene conversion value by GPC method) of the thermoplastic resin (C).
- Mw polystyrene conversion value by GPC method
- the weight average molecular weight of the thermoplastic resin (C) is, for example, 1500 to 100,000, preferably 2,000 to 80,000, more preferably 3,000 to 50,000, more preferably 10,000 to 45,000, and more preferably 15,000 to 35,000.
- the polymer of the polyvalent vinyl ether compound (A) and the compound (B) is softened.
- the point (T 3 ) is preferably higher by 10 ° C. or more than the thermosetting temperature of a permanent adhesive described later used in combination with the temporary adhesive in the semiconductor device manufacturing method according to the present invention.
- the difference between the thermosetting temperature and T 3 of the permanent adhesive is, for example, 10 to 40 ° C, preferably 20 to 30 ° C.
- the content of the polyvalent vinyl ether compound (A) in the temporary adhesive is the total amount of hydroxy groups and carboxy groups in the compound (B) in the temporary adhesive.
- the amount of the vinyl ether group in the polyvalent vinyl ether compound (A) is, for example, 0.01 to 10 mol, preferably 0.05 to 5 mol, more preferably 0.07 to 1 mol, based on 1 mol.
- the amount is preferably 0.08 to 0.5.
- the content of the thermoplastic resin (C) in the temporary adhesive is, for example, 0.1 to 3 parts by mass, preferably 0.2 to 2 parts by mass, relative to 1 part by mass of the compound (B) in the temporary adhesive. , And more preferably 0.3 to 1 part by mass.
- the total content of the polyvalent vinyl ether compound (A), the compound (B) and the thermoplastic resin (C) in the temporary adhesive is, for example, 70 to 99.9 mass% of the total nonvolatile content of the temporary adhesive, and is preferable. Is 80 to 99% by mass, more preferably 85 to 95% by mass, and even more preferably 85 to 90% by mass.
- the temporary adhesive may further contain a polymerization accelerator.
- the polymerization accelerator include a monovalent carboxylic acid represented by the following formula (d) and a monovalent alcohol represented by the following formula (e). These can be used individually by 1 type or in combination of 2 or more types.
- the configuration in which the temporary adhesive contains a polymerization accelerator is suitable for promoting the polymerization reaction of the polyvalent vinyl ether compound (A) and the compound (B), and when using an adhesive containing no polymerization accelerator.
- Z 3 -COOH (d) (In the formula, Z 3 is selected from the group consisting of a saturated or unsaturated aliphatic hydrocarbon, a saturated or unsaturated alicyclic hydrocarbon, and an aromatic hydrocarbon which may have a substituent other than a carboxy group.
- the saturated or unsaturated aliphatic hydrocarbon, saturated or unsaturated alicyclic hydrocarbon, and aromatic hydrocarbon represented by Z 3 in the above formula (d) are the saturated ones mentioned for Z 1 in the above formula (a).
- the substituent which Z 3 may have include an example in which a carboxy group is removed from the examples of the substituent which Z 1 may have.
- the aromatic hydrocarbon for Z 4 in the above formula (e) the aromatic hydrocarbons mentioned for Z 1 in the above formula (a) can be mentioned.
- the substituent which Z 4 may have include an example in which a hydroxy group is removed from the examples of the substituent which Z 1 may have.
- the pKa (acid dissociation constant) of the polymerization accelerator is preferably 3 to 8, more preferably 4 to 6.
- Such a structure prevents storage of the temporary adhesive agent from unintentionally increasing the viscosity due to unintentional polymerization and ensures storage stability, and at the time of forming the temporary adhesive agent layer 2 from the temporary adhesive agent. It is suitable for ensuring the polymerization promoting effect of the polymerization accelerator.
- the compounds shown below are preferable.
- the content thereof is, for example, about 0.01 to 5 parts by mass, preferably 1 part by mass of the polyvalent vinyl ether compound (A) contained in the temporary adhesive.
- the amount is 0.1 to 3 parts by mass, more preferably 0.3 to 1 part by mass.
- the temporary adhesive may further contain an antioxidant.
- the configuration in which the temporary adhesive contains an antioxidant is suitable for preventing the above-mentioned compound (B) and thermoplastic resin (C) from being oxidized during the heat treatment of the temporary adhesive.
- the antioxidant of the compound (B) and the thermoplastic resin (C) in the temporary adhesive is determined by the solubility of the softening composition obtained by heating the temporary adhesive layer 2 formed from the temporary adhesive in a solvent. Therefore, even if adhesive residue remains on the adherend after the temporary adhesive layer 2 is peeled from the adherend such as a wafer through a heat treatment, the adhesive residue is removed. It is suitable for this.
- antioxidants examples include phenolic antioxidants, phosphorus antioxidants, thioester antioxidants, and amine antioxidants. These can be used alone or in combination of two or more. Phenolic antioxidants are particularly preferable as antioxidants in temporary adhesives because they have a particularly excellent antioxidant effect during heat treatment.
- phenolic antioxidants examples include pentaerythritol tetrakis [3 (3,5-di-t-butyl-4-hydroxyphenyl) propionate] and thiodiethylenebis [3- (3,5-di-t-butyl).
- the content thereof is, for example, 0.01 to 15 with respect to 100 parts by mass of the compound (B) and the thermoplastic resin (C) contained in the temporary adhesive. It is a mass part, preferably 0.1 to 12 mass parts, and more preferably 0.5 to 10 mass parts.
- the temporary adhesive may further contain other components as needed.
- other components include an acid generator, a surfactant, a solvent, a leveling agent, a silane coupling agent, and a foaming agent. These can be used alone or in combination of two or more.
- the content of the surfactant in the temporary adhesive is preferably about 0.01 to 1% by mass.
- a surfactant include, for example, trade names “F-444”, “F-447”, “F-554”, “F-556”, and “F-557” (both are fluorine-based oligomers manufactured by DIC), Product names "BYK-350” (acrylic polymer manufactured by BYK Chemie) and product names "A-1420" "A-1620” "A-1630” (all are fluorine-containing alcohol manufactured by Daikin Industries, Ltd.) Can be mentioned. These can be used alone or in combination of two or more.
- the temporary adhesive preferably contains a solvent from the viewpoint of adjusting its viscosity.
- the solvent include toluene, hexane, isopropanol, methyl isobutyl ketone, cyclopentanone, cyclohexanone, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, and ⁇ -butyrolactone. These can be used alone or in combination of two or more.
- the solvent content of the temporary adhesive is, for example, 55 to 80% by mass.
- the temporary adhesive can be prepared by stirring and mixing the constituent components while removing air bubbles under vacuum if necessary.
- the temperature of the mixture at the time of stirring and mixing is preferably about 10 to 80 ° C.
- a rotation-revolution type mixer for example, a single-screw or multi-screw extruder, a planetary mixer, a kneader, or a dissolver can be used.
- the viscosity of the temporary adhesive (viscosity measured under conditions of 25 ° C. and shear rate of 50 / s) is, for example, about 30 to 2000 mPa ⁇ s, preferably 300 to 1500 mPa ⁇ s, and more preferably 500 to 1500 mPa ⁇ s. Is.
- Such a configuration is suitable for securing the coatability of the temporary adhesive and uniformly coating it on the surface of an adherend such as a wafer.
- a polymer can be produced from the polyvalent vinyl ether compound (A) and the compound (B) by acetal-bonding the hydroxy group and / or the carboxy group.
- a tentative compound containing a compound represented by the following formula (a ′) as the polyvalent vinyl ether compound (A) and a compound having a structural unit represented by the following formula (b ′) as the compound (B) A polymer represented by the following formula (P) is obtained by subjecting the adhesive to heat treatment to polymerize both these compounds.
- the softening point (T 3 ) of the polymer obtained by subjecting the temporary adhesive to heat treatment can be controlled by adjusting the relative amounts of the polyvalent vinyl ether compound (A) and the compound (B).
- the softening point (T 3 ) of the polymer is, for example, 130 ° C. or higher, and preferably 130 to 170 ° C., more preferably 140 to 160 ° C.
- the softening points of the above-mentioned polymer of the polyvalent vinyl ether compound (A) and the compound (B), the polyvalent vinyl ether compound (A), the compound (B), and the thermoplastic resin (C) are high under the following flow conditions. It can be measured using a chemical flow tester. ⁇ Flow conditions> Pressure: 100kg / cm 2 Speed: 6 °C / min Nozzle: 1mm ⁇ ⁇ 10mm
- the softening point of the temporary adhesive layer formed from the temporary adhesive shall be the temperature determined as follows. First, 0.1 g of the temporary adhesive is applied to the first glass plate to a thickness of 10 ⁇ m to form a coating film of the temporary adhesive. Next, the 2nd glass plate is piled up on the coating film. Next, through a heat treatment, the polyvalent vinyl ether compound (A) and the compound (B) are polymerized in the temporary adhesive between the first and second glass plates to cure the temporary adhesive, The two glass plates are joined together with an adhesive.
- the heat treatment includes, for example, heating at 140 ° C. for 2 minutes, followed by heating at 200 ° C. for 2 minutes, and then heating at 230 ° C. for 4 minutes.
- a laminated body having a laminated structure of the first glass plate, the second glass plate, and the temporary adhesive layer therebetween can be obtained.
- the first glass plate was pulled by applying a stress of 2 kg in the horizontal direction (in-plane direction of the glass plate) while heating, and the first glass plate was Measure the temperature at the beginning of movement.
- the temperature obtained as described above is the softening point.
- the wafer 1 is thinned in each reinforcing wafer 1R (thinning process). Specifically, in each of the reinforced wafers 1R, the wafer 1 supported by the support substrate S is ground from the back surface 1b side thereof by using a grind device so that the wafer 1 has a predetermined thickness. The thinned wafer 1T is formed by further thinning. The thickness of the thinned wafer 1 (thinned wafer 1T) is, for example, 1 to 20 ⁇ m.
- the thinned wafer 1T side of the reinforcing wafer 1R is bonded to the wafer 3 which is the base wafer via the adhesive 4 (bonding). Process).
- the bonding process is performed for each of the two reinforcing wafers 1R.
- the wafer 3 is a base wafer having a semiconductor wafer body in which semiconductor elements can be formed, and has an element forming surface 3a and a back surface 3b opposite to this.
- the constituent materials for forming the semiconductor wafer main body of the wafer 3 for example, those listed above as the constituent materials for forming the semiconductor wafer main body of the wafer 1 can be adopted.
- the thickness of the wafer 3, which is the base wafer is preferably 300 ⁇ m or more, more preferably 500 ⁇ m or more, and more preferably 700 ⁇ m or more from the viewpoint of ensuring the strength of the wafer stack including the wafer 3 in the manufacturing process. is there.
- the thickness of the wafer 3 is preferably 1000 ⁇ m or less, more preferably 900 ⁇ m or less, and still more preferably 800 ⁇ m or less from the viewpoint of shortening the grinding time for the wafer 3 in the later-described grinding step.
- the adhesive 4 is a thermosetting adhesive for realizing a bonded state between wafers, and in the present embodiment, a polymerizable group-containing polyorganosilsesquioxane (that is, a polymerizable functional group) as a thermosetting resin is used.
- a polymerizable group-containing polyorganosilsesquioxane that is, a polymerizable functional group
- Group containing a polyorganosilsesquioxane The polymerizable functional group contained in the polymerizable group-containing polyorganosilsesquioxane is preferably an epoxy group or a (meth) acryloyloxy group.
- the polymerizable group-containing polyorganosilsesquioxane is suitable for achieving a relatively low polymerization temperature or curing temperature of, for example, about 30 to 200 ° C.
- the adhesive bonding between wafers by the adhesive containing the polymerizable group-containing polyorganosilsesquioxane realizes high heat resistance in the adhesive layer formed between the wafers, and the curing temperature for forming the adhesive layer.
- the content of the polymerizable group-containing polyorganosilsesquioxane in the adhesive 4 is, for example, 70% by mass or more, preferably 80 to 99.8% by mass, and more preferably 90 to 99.5% by mass.
- a benzocyclobutene (BCB) resin or a novolac epoxy resin may be adopted instead of the polymerizable group-containing polyorganosilsesquioxane.
- the polymerizable group-containing polyorganosilsesquioxane contained in the adhesive 4 is a first structural unit [RSiO] containing at least a structural unit represented by the following formula (1) as a siloxane structural unit. 3/2 ] and a second constitutional unit [RSiO 2/2 (OR ′)] containing at least a constitutional unit represented by the following formula (2) (R and R ′ in the second constitutional unit are the same. May be different or different).
- These structural units belong to so-called T units in the siloxane structural unit, and in the present embodiment, the structural unit [RSiO 3/2 ] is a T3 body and the structural unit [RSiO 2/2 (OR ′)] is a T2 body.
- the silicon atom is bonded to three oxygen atoms, each of which is also bonded to a silicon atom in another siloxane constitutional unit.
- the silicon atom is bonded to two oxygen atoms each of which is also bonded to a silicon atom in another siloxane constitutional unit, and is also bonded to the oxygen of the alkoxy group.
- Both the T3 body and the T2 body belong to the T unit as the siloxane constitutional unit as described above, and are formed by hydrolysis of the silane compound having three hydrolyzable functional groups and the subsequent condensation reaction. Is a partial structure of a polymerizable group-containing polyorganosilsesquioxane.
- R 1 R 1 and in Formula (2) in the formula (1) each represent a group containing an epoxy group or (meth) acryloyloxy group.
- R 2 in the formula (2) represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
- each R 1 in the formulas (1) and (2) is an epoxy group-containing group
- examples of the R 1 include groups represented by the following formulas (3) to (6).
- Each of R 3 , R 4 , R 5 , and R 6 in the formulas (3) to (6) represents a linear or branched alkylene group having, for example, 1 to 10 carbon atoms.
- Examples of such an alkylene group include a methylene group, a methylmethylene group, a dimethylmethylene group, an ethylene group, a propylene group, a trimethylene group, a tetramethylene group, a pentamethylene group, a hexamethylene group, and a decamethylene group.
- R 1 as the epoxy group-containing group in formula (1) and formula (2) is preferably Is an epoxy group-containing group represented by the formula (3) or an epoxy group-containing group represented by the formula (4), and more preferably a group represented by the formula (3) in which R 3 is ethylene.
- the group is a 2- (3,4-epoxycyclohexyl) ethyl group.
- R 2 in the formula (2) represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and therefore OR 2 in the formula (2) is a hydroxy group or 1 to 4 carbon atoms.
- the polymerizable group-containing polyorganosilsesquioxane contained in the adhesive 4 may include one type or two or more types as the structural unit represented by the above formula (1).
- the polymerizable group-containing polyorganosilsesquioxane may contain one type or two or more types as the structural unit represented by the above formula (2).
- R 7 in formula (7) is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted Represents a substituted aralkyl group.
- R 7 in formula (7) is preferably a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, or a substituted or unsubstituted aryl group, and more preferably a phenyl group.
- Examples of the alkyl group described above for R 7 include a methyl group, an ethyl group, a propyl group, an n-butyl group, an isopropyl group, an isobutyl group, a s-butyl group, a t-butyl group, and an isopentyl group.
- Examples of the alkenyl group described above for R 7 include a vinyl group, an allyl group, and an isopropenyl group.
- Examples of the cycloalkyl group described above for R 7 include a cyclobutyl group, a cyclopentyl group, and a cyclohexyl group.
- Examples of the aryl group described above for R 7 include a phenyl group, a tolyl group, and a naphthyl group.
- Examples of the aralkyl group described above for R 7 include a benzyl group and a phenethyl group.
- Examples of the substituent of the alkyl group, alkenyl group, cycloalkyl group, aryl group, and aralkyl group described above for R 7 include an ether group, an ester group, a carbonyl group, a siloxane group, a halogen atom such as a fluorine atom, an acrylic group, Examples thereof include a methacryl group, a mercapto group, an amino group, and a hydroxyl group.
- the above-mentioned polymerizable group-containing polyorganosilsesquioxane contained in the adhesive 4 is represented by the following formula (8) as the T2 body in addition to the constitutional unit represented by the formula (2).
- R 7 in formula (8) is a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted It represents a substituted aralkyl group, and is specifically the same as R 7 in the above formula (7).
- R 2 in the formula (8) represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and is specifically the same as R 2 in the formula (2).
- the above-mentioned polymerizable group-containing polyorganosilsesquioxane contained in the adhesive 4 is a so-called M unit in the siloxane constitutional unit in addition to the above-mentioned first and second constitutional units which are T units. At least one selected from the group consisting of a unit [RSiO 1/2 ], a structural unit [R 2 SiO 2/2 ] which is a so-called D unit, and a structural unit [SiO 4/2 ] which is a so-called Q unit. Good.
- the polymerizable group-containing polyorganosilsesquioxane may have any of cage type, incomplete cage type, ladder type and random type silsesquioxane structures, and two or more of these silsesquioxane structures may be contained. It may have a structure in which
- the value of the molar ratio of T3 body to T2 body (that is, T3 body / T2 body) is, for example, 5 to 500,
- the lower limit value is preferably 10.
- the upper limit value is preferably 100, more preferably 50.
- the polymerizable group-containing polyorganosilsesquioxane by adjusting the value of [T3 body / T2 body] within the range, components other than the polymerizable group-containing polyorganosilsesquioxane contained in the adhesive 4 can be used. The compatibility is improved and the handleability is improved.
- the value of [T3 body / T2 body] is 5 to 500 means that the amount of T2 body is relatively small compared to T3 body, and the hydrolysis of silanol It means that the condensation reaction is more advanced.
- the value of the above molar ratio (T3 form / T2 form) in the polymerizable group-containing polyorganosilsesquioxane can be determined by, for example, 29 Si-NMR spectrum measurement.
- the silicon atom in the above-mentioned first structural unit (T3 body) and the silicon atom in the above-mentioned second structural unit (T2 body) show different peaks or signals of chemical shift. From the area ratio of these peaks, the value of the above molar ratio can be obtained.
- the 29 Si-NMR spectrum of the polymerizable group-containing polyorganosilsesquioxane can be measured, for example, by the following apparatus and conditions.
- Measuring device trade name "JNM-ECA500NMR” (manufactured by JEOL Ltd.) Solvent: Deuterated chloroform Accumulation frequency: 1800 Measurement temperature: 25 ° C
- the number average molecular weight (Mn) of the polymerizable group-containing polyorganosilsesquioxane contained in the adhesive 4 is preferably 1000 to 50000, more preferably 1500 to 10000, more preferably 2000 to 8000, and more preferably It is 2000 to 7000.
- the number average molecular weight is preferably 1000 or more, the insulating property, heat resistance, crack resistance, and adhesiveness of the formed cured product or adhesive layer are improved.
- the number average molecular weight is 50,000 or less, the compatibility of the polymerizable group-containing polyorganosilsesquioxane in the adhesive 4 with other components is improved, and the cured product or the adhesive layer formed is insulated. Property, heat resistance, and crack resistance are improved.
- the molecular weight dispersity (Mw / Mn) of the polymerizable group-containing polyorganosilsesquioxane contained in the adhesive 4 is preferably 1.0 to 4.0, more preferably 1.1 to 3.0. , And more preferably 1.2 to 2.7.
- Mw / Mn The molecular weight dispersity
- the molecular weight dispersity is preferably 1.0 to 4.0, more preferably 1.1 to 3.0. , And more preferably 1.2 to 2.7.
- the molecular weight dispersity is 1.0 or more, the adhesive composition tends to be in a liquid state, and the handling property thereof tends to be improved.
- the number average molecular weight (Mn) and weight average molecular weight (Mw) of the polymerizable group-containing polyorganosilsesquioxane shall be the values calculated by polystyrene conversion measured by gel permeation chromatography (GPC).
- the number average molecular weight (Mn) and weight average molecular weight (Mw) of the polymerizable group-containing polyorganosilsesquioxane are as follows using, for example, an HPLC device (trade name “LC-20AD”, manufactured by Shimadzu Corporation). It can be measured under the conditions of.
- the above-mentioned polymerizable group-containing polyorganosilsesquioxane can be produced by hydrolysis of a silane compound having three hydrolyzable functional groups and subsequent condensation reaction.
- the raw material used for the production includes at least a compound represented by the following formula (9) and optionally a compound represented by the following formula (10).
- the compound represented by the formula (9) is for forming the constitutional unit represented by the above formula (1) and the constitutional unit represented by the above formula (2).
- the compound represented by the formula (10) is for forming the constitutional unit represented by the formula (7) and the constitutional unit represented by the formula (8).
- R 1 in formula (9) represents a group containing a polymerizable group, and is specifically the same as R 1 in formulas (1) and (2).
- X 1 in formula (9) represents an alkoxy group or a halogen atom.
- the alkoxy group include alkoxy groups having 1 to 4 carbon atoms such as a methoxy group, an ethoxy group, a propoxy group, an isopropyloxy group, a butoxy group and an isobutyloxy group.
- the halogen atom as X 1 include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- X 1 is preferably an alkoxy group, more preferably a methoxy group or an ethoxy group. In formula (9), three X 1's may be the same or different.
- R 7 in formula (10) is a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted alkenyl.
- X 2 in formula (10) represents an alkoxy group or a halogen atom, and is specifically the same as X 1 in formula (9).
- the raw material used for producing the above-mentioned polymerizable group-containing polyorganosilsesquioxane may further contain another hydrolyzable silane compound.
- examples of such a compound include a hydrolyzable trifunctional silane compound other than both compounds represented by the above formulas (9) and (10), a hydrolyzable monofunctional silane compound which forms an M unit, D
- the hydrolyzable bifunctional silane compound which forms a unit and the hydrolyzable tetrafunctional silane compound which forms a Q unit are mentioned.
- the amount and composition of the hydrolyzable silane compound used as the above raw material are appropriately adjusted depending on the structure of the polymerizable group-containing polyorganosilsesquioxane, which is the intended product.
- the amount of the compound represented by the above formula (9) used is, for example, 55 to 100 mol%, preferably 65 to 100 mol% based on the total amount of the hydrolyzable silane compound used.
- the amount of the compound represented by the above formula (10) used is, for example, 0 to 70 mol% based on the total amount of the hydrolyzable silane compound used.
- the total amount of the compound represented by the formula (9) and the compound represented by the formula (10) based on the total amount of the hydrolyzable silane compound used is, for example, 60 to 100 mol%, preferably 70 to 100 mol%. , And more preferably 80 to 100 mol%.
- hydrolysis and condensation reaction for each kind of hydrolyzable silane compounds can be carried out simultaneously. , Can also be performed sequentially.
- the above-mentioned hydrolysis and condensation reaction is preferably carried out in the presence of one kind or two or more kinds of solvents.
- Preferred solvents include, for example, ethers such as diethyl ether, dimethoxyethane, tetrahydrofuran and dioxane, and ketones such as acetone and methyl ethyl ketone and methyl isobutyl ketone.
- the amount of the solvent used is appropriately adjusted within a range of, for example, 2000 parts by mass or less per 100 parts by mass of the hydrolyzable silane compound according to the reaction time and the like.
- the above-mentioned hydrolysis and condensation reactions are preferably carried out in the presence of one or more catalysts and water.
- the catalyst may be an acid catalyst or an alkali catalyst.
- the amount of the catalyst used is appropriately adjusted within the range of, for example, 0.002 to 0.2 mol per mol of the hydrolyzable silane compound.
- the amount of water used is appropriately adjusted within the range of, for example, 0.5 to 20 mol per mol of the hydrolyzable silane compound.
- the hydrolysis and condensation reaction of the above hydrolyzable silane compound may be carried out in one step or in two or more steps.
- the reaction temperature of the first-stage hydrolysis and condensation reaction is For example, it is 40 to 100 ° C, preferably 45 to 80 ° C.
- the reaction time of the first-stage hydrolysis and condensation reaction is, for example, 0.1 to 10 hours, preferably 1.5 to 8 hours.
- the reaction temperature for the second-stage hydrolysis and condensation reaction is preferably 5 to 200 ° C, more preferably 30 to 100 ° C.
- the reaction time of the second-stage hydrolysis and condensation reaction is not particularly limited, but is preferably 0.5 to 1000 hours, more preferably 1 to 500 hours. Further, the above-mentioned hydrolysis and condensation reaction can be carried out under normal pressure, under pressure, or under reduced pressure. The above-mentioned hydrolysis and condensation reaction is preferably carried out under an atmosphere of an inert gas such as nitrogen or argon.
- the above-mentioned polymerizable group-containing polyorganosilsesquioxane can be obtained.
- the catalyst for suppressing ring opening of the polymerizable group is preferably neutralized.
- the polymerizable group-containing polyorganosilsesquioxane thus obtained is optionally purified.
- the adhesive 4 preferably contains at least one curing catalyst in addition to the polymerizable group-containing polyorganosilsesquioxane produced as described above.
- examples of the curing catalyst include a thermal cationic polymerization initiator.
- a thermal radical polymerization initiator can be mentioned.
- the content of the curing catalyst in the adhesive 4 is preferably 0.1 to 3.0 parts by mass per 100 parts by mass of the polymerizable group-containing polyorganosilsesquioxane.
- thermal cationic polymerization initiators examples include thermal cationic polymerization initiators of the type such as arylsulfonium salts, aluminum chelates, and boron trifluoride amine complex.
- arylsulfonium salt examples include hexafluoroantimonate salt.
- aluminum chelate examples include ethyl acetoacetate aluminum diisopropylate, and aluminum tris (ethyl acetoacetate).
- boron trifluoride amine complex examples include boron trifluoride monoethylamine complex, boron trifluoride imidazole complex, and boron trifluoride piperidine complex.
- thermal radical polymerization initiators mentioned above include, for example, thermal radical polymerization initiators of the type such as azo compounds and peroxides.
- thermal radical polymerization initiators of the type such as azo compounds and peroxides.
- the azo compound include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2,4-dimethylvaleronitrile) and 2,2′-azobis (4-methoxy-2,4- Dimethylvaleronitrile), dimethyl-2,2'-azobis (2-methylpropionate), 2,2'-azobis (isobutyric acid) dimethyl, diethyl-2,2'-azobis (2-methylpropionate) , And dibutyl-2,2′-azobis (2-methylpropionate).
- peroxides examples include benzoyl peroxide, t-butylperoxy-2-ethylhexanoate, 2,5-dimethyl-2,5-di (2-ethylhexanoyl) peroxyhexane, and t-butyl.
- Peroxybenzoate t-butyl peroxide, cumene hydroperoxide, dicumyl peroxide, di-t-butyl peroxide, 2,5-dimethyl-2,5-dibutylperoxyhexane, 2,4-dichlorobenzoylper Oxide, 1,4-di (2-t-butylperoxyisopropyl) benzene, 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, methyl ethyl ketone peroxide, and 1,1, Mention may be made of 3,3-tetramethylbutylperoxy-2-ethylhexanoate.
- the adhesive 4 may contain one kind or two or more kinds of other curable compounds in addition to the above-mentioned polymerizable group-containing polyorganosilsesquioxane.
- the curable compound include epoxy compounds other than the above-mentioned polymerizable group-containing polyorganosilsesquioxane, (meth) acryloyloxy group-containing compound, vinyl group-containing compound, oxetane compound, and vinyl ether compound.
- Examples of the epoxy compound other than the above-described polymerizable group-containing polyorganosilsesquioxane include alicyclic epoxy compounds (alicyclic epoxy resins), aromatic epoxy compounds (aromatic epoxy resins), and aliphatic epoxy compounds. (Aliphatic epoxy resin).
- Examples of the alicyclic epoxy compound include 3,4,3 ', 4'-diepoxybicyclohexane, 2,2-bis (3,4-epoxycyclohexyl) propane, 1,2-bis (3,4- Epoxycyclohexyl) ethane, 2,3-bis (3,4-epoxycyclohexyl) oxirane, bis (3,4-epoxycyclohexylmethyl) ether, and 1,2-bis (hydroxymethyl) -1-butanol 2-epoxy-4- (2-oxiranyl) cyclohexane adduct (for example, "EHPE3150" manufactured by Daicel Corporation) can be mentioned.
- 2,2-bis (3,4-epoxycyclohexyl) propane 1,2-bis (3,4- Epoxycyclohexyl) ethane
- 2,3-bis (3,4-epoxycyclohexyl) oxirane bis (3,4-epoxycyclohexylmethyl)
- aromatic epoxy compound examples include epibis type glycidyl ether type epoxy resin and novolak alkyl type glycidyl ether type epoxy resin.
- Examples of the aliphatic epoxy compound include a glycidyl ether of a q-valent alcohol (q is a natural number) having no cyclic structure, a glycidyl ester of a monovalent carboxylic acid or a polyvalent carboxylic acid, and a double bond.
- An epoxidized product of fats and oils can be mentioned.
- Examples of epoxidized fats and oils having a double bond include epoxidized linseed oil, epoxidized soybean oil, and epoxidized castor oil.
- the above-mentioned (meth) acryloyloxy group-containing compound for example, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dimethacrylate.
- Examples of the above-mentioned vinyl group-containing compound include styrene and divinylbenzene.
- oxetane compound examples include 3,3-bis (vinyloxymethyl) oxetane, 3-ethyl-3- (hydroxymethyl) oxetane, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, 3- Ethyl-3- (hydroxymethyl) oxetane, 3-ethyl-3-[(phenoxy) methyl] oxetane, 3-ethyl-3- (hexyloxymethyl) oxetane, 3-ethyl-3- (chloromethyl) oxetane, and Mention may be made of 3,3-bis (chloromethyl) oxetane.
- Examples of the above-mentioned vinyl ether compound include 2-hydroxyethyl vinyl ether, 3-hydroxypropyl vinyl ether, 2-hydroxypropyl vinyl ether, 2-hydroxyisopropyl vinyl ether, 4-hydroxybutyl vinyl ether, 3-hydroxybutyl vinyl ether and 2-hydroxybutyl vinyl ether.
- Adhesive 4 preferably contains a solvent in order to adjust the coatability and the like.
- the solvent include propylene glycol monomethyl ether acetate, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, ethyl acetate, butyl acetate, 3-methoxybutyl acetate, methoxypropyl acetate, ethylene glycol monomethyl ether acetate, methanol, ethanol, Examples include isopropyl alcohol, 1-butanol, 1-methoxy-2-propanol, 3-methoxybutanol, ethoxyethanol, diisopropyl ether, ethylene glycol dimethyl ether, and tetrahydrofuran.
- the adhesive 4 further includes various additives such as a silane coupling agent, a defoaming agent, an antioxidant, an antiblocking agent, a leveling agent, a surfactant, a bulking agent, an anticorrosive agent, an antistatic agent, a plasticizer, etc. May be included.
- a silane coupling agent such as a silane coupling agent, a defoaming agent, an antioxidant, an antiblocking agent, a leveling agent, a surfactant, a bulking agent, an anticorrosive agent, an antistatic agent, a plasticizer, etc. May be included.
- the thermal decomposition temperature of the adhesive 4 is preferably 200 ° C. or higher, more preferably 260 ° C. or higher, more preferably 300 ° C. or higher.
- the thermal decomposition temperature is a curve obtained by thermogravimetric analysis using a differential thermogravimetric simultaneous measurement apparatus, that is, a curve showing the temperature dependence of thermogravimetricity in a predetermined temperature rising range of a sample to be analyzed.
- the tangent line of the part where there is no weight loss at the beginning of the heating process or it decreases slightly at a constant rate, and the inflection in the part where significant weight loss occurs in the middle of the heating process following the beginning of the heating process The temperature is indicated by the intersection with the tangent line at the point.
- a trade name “TG-DTA6300” manufactured by Seiko Instruments Inc. can be used.
- the thinned wafer in the reinforcing wafer 1R is bonded to the element forming surface 3a side of the wafer 3 via the adhesive 4 as described above.
- the back surface 1b side of 1T is bonded (face-to-back bonding) to form a wafer stacked body X (first wafer stacked body).
- the adhesive 4 is applied by spin coating to one or both of the bonding target surfaces (the element forming surface 3a of the wafer 3 and the back surface 1b of the thinned wafer 1T) to form an adhesive layer.
- FIG. 3A exemplifies a case where the adhesive 4 is applied to the element forming surface 3 a of the wafer 3.
- one or both surfaces to be joined may be treated with a silane coupling agent.
- the adhesive 4 (adhesive layer) is dried and solidified by heating.
- the heating temperature at this time is, for example, 50 to 150 ° C., and the heating time is, for example, 5 to 120 minutes.
- the heating temperature may be constant or may be changed stepwise.
- the surfaces to be joined are bonded together via the adhesive 4 (adhesive layer).
- the applied pressure is, for example, 300 to 5000 g / cm 2
- the temperature is, for example, 30 to 200 ° C., preferably in the range of room temperature to 80 ° C.
- the adhesive 4 is cured by heating between the surfaces to be joined.
- the heating temperature for curing is, for example, 30 to 200 ° C., preferably 50 to 190 ° C.
- the heating time for curing is, for example, 5 to 120 minutes.
- the heating temperature may be constant or may be changed stepwise.
- the thickness of the adhesive layer after curing the adhesive 4 is, for example, 0.5 to 20 ⁇ m.
- the above-described configuration in which the adhesive 4 is hardened at a relatively low temperature in this step to realize the adhesive bonding is suitable for suppressing the dimensional change of the adhesive 4 interposed between the wafers at the time of bonding and at the same time for the adhered material. It is also suitable for suppressing damage to elements in the body of the wafer.
- the support substrate S is removed as shown in FIG. 3C (removing step). Specifically, the temporary adhesion state by the temporary adhesive layer 2 between the support substrate S and the thinned wafer 1T in each wafer laminated body X obtained through the above-mentioned bonding process is released, and the support substrate S is removed. To do.
- the removal step is preferably performed temporarily at a temperature higher than the softening point (T 3 ) of the above-mentioned polymer in the temporary adhesive layer 2, that is, the polymer of the polyvalent vinyl ether compound (A) and the compound (B). A softening treatment for softening the adhesive layer 2 is included.
- the heating temperature of the temporary adhesive layer in the softening treatment is preferably 170 ° C. or higher and, for example, 250 ° C. or lower, preferably 240 ° C. or lower, and more preferably 230 ° C. or lower.
- the support substrate S is slid on the wafer 1 to separate or remove the support substrate S. If the temporary adhesive remains on the wafer 1 after the reinforcement wafer 1R is removed, the temporary adhesive is removed. For this removing operation, one or more kinds of solvents in which the temporary adhesive easily dissolves can be used.
- Such solvents include, for example, cyclohexanone, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, acetone, ethyl acetate, butyl acetate, and methyl isobutyl ketone.
- FIGS. 4 (a) and 4 (b) a multi-layering process as shown in FIGS. 4 (a) and 4 (b) is performed. Specifically, the thinned wafers 1T in the two wafer laminated bodies X that have undergone the above-described removal process are bonded to each other on the element forming surface 1a side via an adhesive 4 (bonding by face-to-face), A laminated body Y (second wafer laminated body) is formed.
- the adhesive 4 is applied by spin coating to one or both of the bonding target surfaces (element forming surface 1a of the two thinned wafers 1T).
- FIG. 4A exemplifies a case where the adhesive 4 is applied to one element forming surface 1a.
- one or both surfaces to be joined may be treated with a silane coupling agent.
- the heating temperature, the heating time, and the pressure condition regarding the adhesive bonding in this step are the heating temperature, the heating time regarding the adhesive bonding in the bonding step described above with reference to FIGS. 3A and 3B, And pressure conditions.
- the wafer 3 located at one end of the wafer stack Y in the stacking direction is thinned.
- the wafer 3 is thinned to a predetermined thickness by grinding the one wafer 3 from the back surface 3b side using a grind device.
- the thickness of the thinned wafer 3 is, for example, 1 to 20 ⁇ m.
- the through electrode 5 is formed as shown in FIG. 5 (through electrode forming step).
- the through electrode 5 is for electrically connecting semiconductor elements formed on different wafers in the formed wafer stack, and is located at one end of the wafer stack in the stacking direction in the present embodiment. It extends through the wafer stack from the back surface 3b of the wafer 3 to the element forming surface 3a of the wafer 3 located at the other end.
- the through electrode 5 can be formed through, for example, filling. Further, the method described in JP-A-2016-4835, for example, may be adopted to form the through electrode 5.
- the through electrodes 5 are formed on the wiring structure (not shown) formed on the element forming surface 1a side of each thinned wafer 1T and on the element forming surface 3a side of the wafer 3.
- Existing wiring structures (not shown) are electrically connected to each other.
- the configuration of forming the through electrode 5 as described above is suitable for realizing efficient digital signal processing in a manufactured semiconductor device, and is suitable for suppressing attenuation of a high frequency signal. It is also suitable for suppressing power consumption.
- the other wafer 3 (the lower wafer 3 in the drawing) may be thinned as shown in FIG.
- the wafer 3 is thinned to a predetermined thickness by grinding the back surface 3b side of the wafer 3.
- the thickness of the thinned wafer 3 is, for example, 5 to 400 ⁇ m.
- Such a configuration is suitable for reducing the thickness of the manufactured semiconductor device.
- external connection bumps may be formed on the back surface 3b of the wafer 3 located on the upper side in FIG.
- a through electrode (not shown) which penetrates the wafer 3 located on the lower side in FIG. 6 and is electrically connected to a wiring structure (not shown) on the element forming surface 3a side of the wafer 3 is formed
- An external connection bump (not shown) electrically connected to the through electrode may be formed on the back surface 3b side of the wafer 3.
- a semiconductor device having a three-dimensional structure in which semiconductor elements are integrated in the thickness direction can be manufactured.
- This semiconductor device may be diced into individual pieces.
- this semiconductor device manufacturing method it is also possible to further stack the thinned wafers 1T on each wafer stacked body X before the multi-layering process by joining the wafer stacked bodies X to each other. Specifically, it is as follows.
- the reinforcing wafer 1R has a laminated structure including the wafer 1 having the element forming surface 1a and the back surface 1b, the supporting substrate S, and the temporary adhesive layer 2 between them.
- the temporary adhesive layer 2 is formed from the above-mentioned temporary adhesive.
- the wafer 1 supported by the support substrate S is ground from the back surface 1b side thereof by using a grind device so that the wafer 1 has a predetermined thickness.
- the thinned wafer 1T is formed by further thinning.
- the thickness of the thinned wafer 1 (thinned wafer 1T) is, for example, 1 to 20 ⁇ m.
- the back surface 1b side of the thinned wafer 1T in the separately prepared reinforcing wafer 1R is attached to the wafer laminated body X that has undergone the above-described removal step.
- the thinned wafer 1T is bonded to the element formation surface 1a side via the adhesive 4 (additional bonding step, face-to-back bonding).
- the adhesive 4 is applied by spin coating to one or both of the bonding target surfaces (the element forming surface 1a of one thinned wafer 1T and the back surface 1b of the other thinned wafer 1T).
- the heating temperature, the heating time, and the pressure condition regarding the adhesive bonding in this step are the heating temperature, the heating time regarding the adhesive bonding in the bonding step described above with reference to FIGS. 3A and 3B, And pressure conditions.
- the support substrate S is removed from each of the wafer stacked bodies X that have undergone the additional bonding process (removal process after the additional bonding process).
- the temporary adhesive state by the temporary adhesive layer 2 between the support substrate S and the thinned wafer 1T in each wafer laminated body X obtained through the above-described additional bonding step is released to remove the support substrate S. Remove it.
- the removal step is preferably performed temporarily at a temperature higher than the softening point (T 3 ) of the above-mentioned polymer in the temporary adhesive layer 2, that is, the polymer of the polyvalent vinyl ether compound (A) and the compound (B).
- a softening treatment for softening the adhesive layer 2 is included.
- the heating temperature of the temporary adhesive layer and the method of removing the supporting substrate in this softening treatment are the same as those in the removing step described above with reference to FIG.
- a thinning step (FIG. 1) of thinning the wafer 1 of the reinforcing wafer 1R for each additional reinforcing wafer 1R prepared, and the above-mentioned additional bonding step in each wafer laminated body X and
- a series of steps including the subsequent removing step (FIG. 7)
- a plurality of thinned wafers 1T can be sequentially stacked in each wafer stacked body X.
- FIG. 8A shows, as an example, a wafer laminated body X obtained by arranging three thinned wafers 1T on the wafer 3 in multiple stages.
- the wafer laminated body X the wafer 3 may be thinned as shown in FIG.
- the wafer 3 can be thinned to a predetermined thickness by grinding the wafer 3 from the back surface 3b side using a grind device.
- the thickness of the thinned wafer 3 is, for example, 1 to 200 ⁇ m.
- a multi-layering process of joining the two wafer laminated bodies X shown in FIG. 8A as shown in FIGS. 9A and 9B is performed.
- the thinned wafers 1T in the two wafer laminated bodies X shown in FIG. 8A are bonded to each other on the element forming surface 1a side with an adhesive 4 (face-to-face bonding),
- a wafer laminated body Y (second wafer laminated body) is formed.
- the adhesive 4 is applied by spin coating to one or both of the bonding target surfaces (element forming surface 1a of the two thinned wafers 1T).
- the heating temperature, the heating time, and the pressure condition regarding the adhesive bonding in this step are the heating temperature, the heating time regarding the adhesive bonding in the bonding step described above with reference to FIGS. 3A and 3B, And pressure conditions.
- the wafer 3 located at one end of the wafer stack Y in the stacking direction is thinned. Specifically, the wafer 3 is thinned to a predetermined thickness by grinding the one wafer 3 from the back surface 3b side using a grind device.
- the thickness of the thinned wafer 3 is, for example, 1 to 20 ⁇ m.
- the through electrode 5 is formed as shown in FIG. 11 (through electrode forming step).
- the through electrode 5 is for electrically connecting semiconductor elements formed on different wafers in the formed wafer stack, and is located at one end of the wafer stack in the stacking direction in the present embodiment. It extends through the wafer stack from the back surface 3b of the wafer 3 to the element forming surface 3a of the wafer 3 located at the other end.
- the through electrode forming method is the same as the through electrode forming method described above with reference to FIG.
- the other wafer 3 (lower wafer 3 in the figure) may be thinned as shown in FIG.
- the wafer 3 is thinned to a predetermined thickness by grinding the back surface 3b side of the wafer 3.
- the thickness of the thinned wafer 3 is, for example, 5 to 400 ⁇ m.
- Such a configuration is suitable for reducing the thickness of the manufactured semiconductor device.
- external connection bumps may be formed on the back surface 3b of the wafer 3 located on the upper side in FIG.
- a penetrating electrode (not shown) which penetrates the wafer 3 located on the lower side in FIG. 12 and is electrically connected to the wiring structure (not shown) on the element forming surface 3a side of the wafer 3 is formed
- An external connection bump (not shown) electrically connected to the through electrode may be formed on the back surface 3b side of the wafer 3.
- a semiconductor device having a three-dimensional structure in which semiconductor elements are integrated in the thickness direction can be manufactured.
- This semiconductor device may be diced into individual pieces.
- the multi-layering process by the back-to-back bonding of the wafer laminated bodies X may be performed instead of the multi-layering process by the face-to-face bonding of the wafer laminated bodies X.
- the back surface 3b sides of the wafers 3 in the two wafer stacks X shown in FIG. 8B are joined together with the adhesive 4 (back-to-back). Bonding), and a wafer laminated body Y (second wafer laminated body) is formed.
- the adhesive 4 is applied by spin coating to one or both surfaces to be bonded (back surfaces 3b of the two wafers 3).
- FIG. 13A exemplifies a case where the adhesive 4 is applied to the one back surface 3b.
- one or both surfaces to be joined may be treated with a silane coupling agent.
- the heating temperature, the heating time, and the pressure condition regarding the adhesive bonding in this step are the heating temperature, the heating time regarding the adhesive bonding in the bonding step described above with reference to FIGS. 3A and 3B, And pressure conditions.
- the through electrode 5 is formed as shown in FIG. 14 (through electrode forming step).
- the through electrode 5 is for electrically connecting semiconductor elements formed on different wafers in the formed wafer stack, and is located at one end of the wafer stack in the stacking direction in the present embodiment. It extends through the wafer stack from the element forming surface 1a of the thinned wafer 1T to the element forming surface 1a of the thinned wafer 1T located at the other end.
- the through electrode forming method is the same as the through electrode forming method described above with reference to FIG.
- an insulating film (not shown) is formed on the element forming surface 1a of the thinned wafer 1T located at the upper end in FIG. 14, and external connection bumps (not shown) are formed on the insulating film. May be.
- an insulating film (not shown) is formed on the element formation surface 1a of the thinned wafer 1T located at the lower end in FIG. 14, and external connection bumps (not shown) are formed on the insulating film. Good.
- a semiconductor device having a three-dimensional structure in which semiconductor elements are integrated in the thickness direction can be manufactured.
- This semiconductor device may be diced into individual pieces.
- the wafer (wafer 1 of the reinforcing wafer 1R) bonded to the supporting substrate S via the temporary adhesive layer 2 for realizing the temporary adhesion state is thin. After being thinned, it is adhesively bonded to the base wafer 3 (bonding step), or after being thinned, it is adhesively bonded to the thinned wafer 1T of the wafer stack X (additional bonding step). ) After that, the support substrate S is removed from the thinned wafer 1T (removal step).
- Such a configuration is suitable for adhesively bonding a thin wafer to a thicker base wafer having higher mechanical strength while avoiding wafer breakage, thus forming a structure in which thin wafers are arranged in multiple stages. Suitable for
- the thinned wafers 1T in the two wafer laminated bodies X are bonded to each other by the adhesive (face-to-face bonding).
- the back surface 3b side of the base wafer 3 is adhesively bonded (back-to-back bonding), and a thin wafer can be multilayered (multilayering step).
- the wafer laminated body Y thus obtained has a laminated constitution symmetrical in the thickness direction.
- the element forming surfaces of all the wafers included therein (the element forming surface 1a of the thinned wafer 1T, the element forming of the wafer 3 are formed.
- the face 3a) faces the face-to-face joint portion side (inside).
- the back surfaces of all the wafers included therein (the back surface 1b of the thinned wafer 1T, the back surface 3b of the wafer 3) are the back surfaces.
- the wafer laminated body Y having such a symmetrical laminated structure in the thickness direction is unlikely to warp.
- the present semiconductor device manufacturing method is suitable for multilayering a thin wafer while suppressing the warp of the wafer stack.
- Each of the adhesive 4 used in the joining step and the adhesive 4 used in the additional joining step contains the polymerizable group-containing polyorganosilsesquioxane in the above-described embodiment.
- the polymerizable group-containing polyorganosilsesquioxane is suitable for achieving a relatively low polymerization temperature or curing temperature of, for example, about 30 to 200 ° C. as described above, and realizes high heat resistance after curing. Suitable for Therefore, the adhesive bonding between wafers by the adhesive containing the polymerizable group-containing polyorganosilsesquioxane realizes high heat resistance in the adhesive layer formed between the wafers, and the curing temperature for forming the adhesive layer. Is suitable for suppressing damage to the elements in the wafer as the adherend by reducing
- the temporary adhesive for forming the temporary adhesive layer 2 in the reinforcing wafer 1R is a polyvalent vinyl ether compound and a hydroxy group or a carboxy group capable of reacting with the vinyl ether group to form an acetal bond.
- the temporary adhesive having such a structure has a high adhesive force capable of withstanding the grinding or the like in the thinning process with respect to the wafer 1 in the form of the temporary adhesive layer 2 formed by curing between the support substrate S and the wafer 1. It is suitable for realizing a relatively high softening temperature of, for example, about 130 to 250 ° C. while ensuring the temperature.
- the present semiconductor device manufacturing method has the above-mentioned composition suitable for realizing the relatively high softening temperature of the temporary adhesive layer 2 in the reinforcing wafer 1R that is subjected to the bonding process or the additional bonding process.
- the adhesive 4 used in the same step is a polymerizable group-containing polyorganosilsesquioxane-containing adhesive suitable for realizing a relatively low curing temperature and high heat resistance after curing. , With a complex configuration. Such a composite structure is suitable for achieving both the joining step and the additional joining steps and the subsequent removal step.
- the composite structure is configured such that the bonding process and the additional bonding process are performed under a relatively low temperature condition, and the supporting wafer S and the thinned wafer 1T in the reinforcing wafer 1R are temporarily bonded to each other while maintaining the temporary bonding state. It is suitable for realizing good adhesive bonding to another wafer of 1T (wafer 3 in the bonding step, another thinned wafer 1T which is one component of the wafer laminated body X in the additional bonding step), and the subsequent removal step. Is carried out under a relatively high temperature condition to soften the temporary adhesive layer 2 while maintaining the adhesive bond between the thinned wafer 1T and another wafer, and remove the support substrate S from the thinned wafer 1T.
- the temporary adhesive layer 2 is softened and then the temporary adhesive state by the temporary adhesive layer 2 is released. It is suitable for avoiding or suppressing the action of (1) to prevent damage to the wafer.
- FIGS. 15 to 20 show a semiconductor device manufacturing method according to an embodiment of the present invention.
- This manufacturing method is a method for manufacturing a semiconductor device having a three-dimensional structure in which semiconductor elements are integrated in the thickness direction thereof, and FIGS. 15 to 20 are partial cross-sectional views showing the manufacturing process.
- a reinforcing wafer 11R as shown in FIG. 15A is prepared (preparing step).
- the number of the reinforcing wafers 11R prepared is 4 or more, and is determined according to the number of stacked semiconductor elements in the semiconductor device which is a manufacturing target.
- the reinforcing wafer 11R has a laminated structure including the wafer 11, the support substrate 12, and the temporary adhesive layer 13 between them.
- the wafer 11 is a wafer having a semiconductor wafer body in which semiconductor elements can be formed, and has an element forming surface 11a and a back surface 11b opposite to the element forming surface 11a.
- the element formation surface is the surface on the side of which a plurality of semiconductor elements (not shown) are formed on the wafer through the transistor formation process.
- Each semiconductor element of the wafer 11 has, for example, a multilayer wiring structure portion including exposed electrode pads on its surface.
- the wafer 11 has various semiconductor elements already formed on the element forming surface 11a side, and the wiring structure required for the semiconductor element is formed later on the element forming surface 11a. May be.
- the semiconductor wafer body of the wafer 11 As a constituent material for forming the semiconductor wafer body of the wafer 11, for example, silicon (Si), germanium (Ge), silicon carbide (SiC), gallium arsenide (GaAs), gallium nitride (GaN), and indium phosphide (InP) are used. ) Is mentioned.
- the thickness of such a wafer 11 is preferably 1000 ⁇ m or less, more preferably 900 ⁇ m or less, and more preferably 800 ⁇ m or less from the viewpoint of shortening the grinding time in the grinding process described later.
- the thickness of the wafer 11 is, for example, 500 ⁇ m or more.
- the support substrate 12 in the reinforcing wafer 11R is for reinforcing the wafer 11 that becomes thin through the thinning process described below.
- Examples of the support substrate 12 include a silicon wafer and a glass wafer.
- the thickness of the support substrate 12 is preferably 300 ⁇ m or more, more preferably 500 ⁇ m or more, and more preferably 700 ⁇ m or more from the viewpoint of ensuring the function as a reinforcing element.
- the thickness of the support substrate 12 is, for example, 800 ⁇ m or less.
- Such a support substrate 12 is bonded to the element forming surface 11a side of the wafer 11 via a temporary adhesive layer 13.
- the temporary adhesive layer 13 is for realizing a temporary adhesive state between the wafer 11 and the support substrate 12 that can be released afterwards.
- the adhesive for forming such a temporary adhesive layer 13 is, for example, a polymer material that exhibits tackiness or adhesiveness in the temporary adhesive layer 13 in a predetermined temperature range and exceeds the temperature range.
- a polymer material having a softening temperature in a high temperature range an adhesive force that can endure a grinding process described below for forming the wafer 11, a heat resistance that can endure a wafer joining process described below that involves heating, and the like.
- An adhesive having a light peeling function for properly performing the removing process is used.
- the adhesive for forming the temporary adhesive layer 13 for example, a silicone adhesive, an acrylic adhesive, or a wax type adhesive can be adopted.
- the adhesive for forming the temporary adhesive layer 13 those described in JP 2008-13589 A, JP 2008-13590 A, or JP 2008-49443 A may be adopted.
- the adhesive disclosed in Japanese Patent Application No. 2015-200836 can be used as the adhesive.
- the adhesive disclosed in the specification has a polyvalent vinyl ether compound and two or more hydroxy groups or carboxy groups capable of reacting with the vinyl group to form an acetal bond, and can be polymerized with the polyvalent vinyl ether compound.
- the compound contains a compound, and the softening temperature of the polymer is relatively high at about 130 to 250 ° C. Therefore, it is possible to exhibit a high softening temperature after curing.
- the temporary adhesive for forming the temporary adhesive layer 13 includes the above-mentioned polyvalent vinyl ether compound (A) and two or more hydroxy groups or carboxy groups capable of reacting with the vinyl ether group to form an acetal bond. It is preferable to contain at least the compound (B) which has a polyvalent vinyl ether compound and can form a polymer, and the thermoplastic resin (C).
- the thickness of the temporary adhesive layer 13 as described above is, for example, 1 to 20 ⁇ m.
- the reinforced wafer 11R having such a configuration can be manufactured, for example, through the following steps.
- the temporary adhesive layer 13 is formed on the support substrate 12.
- the adhesive composition for forming the temporary adhesive layer 13 is applied onto the support substrate 12 by, for example, spin coating to form a temporary adhesive composition layer, and the composition layer is dried by heating.
- the temporary adhesive layer 13 can be formed by solidifying.
- the heating temperature is, for example, 100 to 300 ° C.
- the heating time is, for example, 30 seconds to 30 minutes.
- FIG. 16B and FIG. 16C the support substrate 12 and the wafer 11 are bonded via the temporary adhesive layer 13.
- the wafer 11 has the element forming surface 11a and the opposite back surface 11b, as described above.
- the support substrate 12 and the wafer 11 are bonded together while being pressed through the temporary adhesive layer 13, and then the support substrate 12 and the wafer 11 are bonded by the temporary adhesive layer 13 through heating.
- the applied pressure is, for example, 300 to 5000 g / cm 2
- the temperature is, for example, 30 to 200 ° C.
- the heating temperature is, for example, 100 to 300 ° C.
- the heating time is, for example, 30 seconds to 30 minutes.
- the reinforcing wafer 11R having a laminated structure including the wafer 11, the support substrate 12, and the temporary adhesive layer 13 between them can be manufactured.
- each of the reinforcing wafers 11R is thinned (thinning step). Specifically, the wafer 11 supported by the support substrate 12 is ground from the back surface 11b side thereof by using a grind device to thin the wafer 11 to a predetermined thickness. To do.
- the thickness of the thinned wafer 11 is, for example, 1 to 20 ⁇ m.
- the back surface 11b sides of the wafer 11 of the two reinforcing wafers 11R that have undergone the thinning process are bonded (bonding process).
- the adhesive layer 14 is formed on the back surface 11b of the wafer 11 in one of the two reinforcing wafers 11R that have undergone the thinning process, and the two back surface 11b sides are bonded together.
- the adhesive layers 14 are attached to each other, and the adhesive layer 14 is cured to bond the two reinforcing wafers 11R as shown in FIG. 17B.
- the wafer two-layer body 1X including the two support substrates 12 is formed.
- the number of wafer bilayer bodies 1X to be formed is two or more, and is determined according to the number of semiconductor element stages in the semiconductor device that is the manufacturing target.
- the thickness of the adhesive layer 14 in the two-layered wafer 1X is, for example, 0.5 to 20 ⁇ m.
- an adhesive is applied to both of the two back surfaces 11b, which are the joining target surfaces, to form the adhesive layer 14, and the back surface 11b sides are bonded to each other via the adhesive layer 14.
- the adhesive layer 14 may be cured after the bonding.
- one or both of the two back surfaces 11b, which are the surfaces to be joined are previously combined with the silane coupling agent from the viewpoint of improving the adhesiveness with the adhesive layer 14. May be applied (silane coupling agent treatment).
- the adhesive layer 14 is for realizing a bonded state between the wafers 11, and is made of a thermosetting adhesive.
- the pressure-sensitive adhesive main component for forming the thermosetting adhesive include polyorganosilsesquioxane, benzocyclobutene (BCB) resin, and novolac epoxy resin.
- the pressure-sensitive adhesive main component in the adhesive layer 14 is preferably polyorganosilsesquioxy. It is a sun-containing thermosetting adhesive.
- the polyorganosilsesquioxane-containing thermosetting adhesive for example, the adhesive described in International Publication No. 2015/0887686 or International Publication No. 2016/204114 can be adopted.
- the composition for forming the adhesive layer 14 preferably contains the above-mentioned polyorganosilsesquioxane-containing thermosetting adhesive, and more preferably a polymerizable group-containing polyorganosilsesquioxane (as a thermosetting resin). That is, it contains a polyorganosilsesquioxane) having a polymerizable functional group.
- the polymerizable functional group contained in the polymerizable group-containing polyorganosilsesquioxane is preferably an epoxy group or a (meth) acryloyloxy group.
- the polymerizable group-containing polyorganosilsesquioxane realizes high heat resistance in the adhesive layer 14 to be formed and, at the same time, lowers the curing temperature for forming the adhesive layer 14 in the adherend wafer 11 to be adhered. It is suitable for suppressing damage to the device.
- the content ratio of the polymerizable group-containing polyorganosilsesquioxane in the composition is, for example, 70% by mass or more, It is preferably 80 to 99.8% by mass, more preferably 90 to 99.5% by mass.
- the composition for forming the adhesive layer 14 contains a polymerizable group-containing polyorganosilsesquioxane
- the polymerizable group-containing polyorganosilsesquioxane is used as the adhesive 4 in the first embodiment of the present invention.
- Those described as the polymerizable group-containing polyorganosilsesquioxane contained in 1) can be used.
- composition for forming the adhesive layer 14 preferably contains at least one curing catalyst in addition to the above-mentioned polymerizable group-containing polyorganosilsesquioxane.
- the curing catalyst includes, for example, a thermal cationic polymerization initiator.
- a thermal cationic polymerization initiator As the curing catalyst when the composition for forming the adhesive layer 14 contains the (meth) acryloyloxy group-containing polyorganosilsesquioxane, for example, a thermal radical polymerization initiator can be mentioned.
- the content of the curing catalyst in the composition for forming the adhesive layer 14 is preferably 0.1 to 3.0 parts by mass per 100 parts by mass of the polymerizable group-containing polyorganosilsesquioxane.
- thermal cationic polymerization initiator and thermal radical polymerization initiator As the above-mentioned thermal cationic polymerization initiator and thermal radical polymerization initiator, the thermal cationic polymerization initiator and thermal radical polymerization initiator described as being contained in the adhesive 4 in the first aspect of the present invention are used. be able to.
- the composition for forming the adhesive layer 14 may contain one kind or two or more kinds of other curable compounds in addition to the above-mentioned polymerizable group-containing polyorganosilsesquioxane.
- the curable compound include epoxy compounds other than the above-mentioned polymerizable group-containing polyorganosilsesquioxane, (meth) acryloyloxy group-containing compound, vinyl group-containing compound, oxetane compound, and vinyl ether compound.
- the compounds described as being contained in the adhesive 4 in the first aspect of the present invention can be used.
- the composition for forming the adhesive layer 14 preferably contains a solvent in order to adjust the coatability and the like.
- the solvent include propylene glycol monomethyl ether acetate, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, ethyl acetate, butyl acetate, 3-methoxybutyl acetate, methoxypropyl acetate, ethylene glycol monomethyl ether acetate, methanol, ethanol,
- Examples include isopropyl alcohol, 1-butanol, 1-methoxy-2-propanol, 3-methoxybutanol, ethoxyethanol, diisopropyl ether, ethylene glycol dimethyl ether, and tetrahydrofuran.
- the composition for forming the adhesive layer 14 further includes a silane coupling agent, a defoaming agent, an antioxidant, an antiblocking agent, a leveling agent, a surfactant, a bulking agent, a rust preventive, an antistatic agent, a plasticizer, and the like. , Various additives may be included.
- the thermal decomposition temperature of the adhesive is preferably 200 ° C or higher, more preferably 260 ° C or higher, and more preferably 300 ° C or higher.
- the thermal decomposition temperature is a curve obtained by thermogravimetric analysis using a differential thermogravimetric simultaneous measurement apparatus, that is, a curve showing the temperature dependence of thermogravimetricity in a predetermined temperature rising range of a sample to be analyzed.
- the tangent line of the part where there is no weight loss at the beginning of the heating process or it decreases slightly at a constant rate, and the inflection in the part where significant weight loss occurs in the middle of the heating process following the beginning of the heating process The temperature is indicated by the intersection with the tangent line at the point.
- a trade name “TG-DTA6300” manufactured by Seiko Instruments Inc. can be used.
- the composition for forming the adhesive layer 14 is applied by spin coating to the back surface 11b of the wafer 11 that is the surface to be bonded to form the adhesive composition layer, and the composition is heated.
- the material layer is dried and solidified.
- the heating temperature at this time is, for example, 50 to 150 ° C., and the heating time is, for example, 5 to 120 minutes.
- the two reinforcing wafers 11R are bonded together while being pressed via the adhesive layer 14, and then the adhesive layer 14 is cured by heating.
- the applied pressure is, for example, 300 to 5000 g / cm 2
- the temperature is, for example, 30 to 200 ° C.
- the heating temperature is, for example, 30 to 200 ° C.
- the heating time is, for example, 5 to 120 minutes.
- the composition for forming the adhesive layer 14 contains an epoxy group-containing polyorganosilsesquioxane as a thermosetting resin and a thermosetting agent, it is preferable that the composition or adhesion between the back surfaces 11b of the reinforcing wafers 11R.
- the bonding via the agent is performed at a temperature of room temperature or higher and 80 ° C. or lower, and the adhesive is cured at a temperature of 50 to 190 ° C. after the bonding.
- Such a configuration is suitable for suppressing the dimensional change of the adhesive agent that is interposed between the wafers 11 at the time of bonding, and further, the curing temperature for forming the adhesive agent layer 14 is lowered, and the wafer as an adherend is intended. It is also suitable for suppressing damage to the elements inside 11.
- FIG. 18A or FIG. 18B at least one support substrate 12 is removed from each wafer two-layer body 1X (removing step). Specifically, the temporary adhesion state of the temporary adhesive layer 13 between the support substrate 12 to be removed and the wafer 11 is released for each wafer two-layer body 1X, and the support substrate 12 is removed.
- FIG. 18A shows a wafer two-layer body 1Xa produced by removing one supporting substrate 12 from the wafer multi-layer body 1X.
- FIG. 18B shows a wafer two-layer body 1Xb produced by removing both supporting substrates 12 from the wafer multi-layered body 1X.
- each support substrate 12 can be performed by mechanical peeling work or removal work.
- mechanical peeling for example, a work in which the support substrate 12 and the wafer 11 are temporarily bonded via the temporary adhesive layer 13 is held between chucks, and There is a method of inserting a blade while introducing air.
- the temporary adhesive layer 13 is a polymer material that exhibits tackiness or adhesiveness in a predetermined temperature range as its adhesive component, and has the softening temperature in a high temperature range exceeding the temperature range.
- the support substrate 12 is slid on the wafer 11.
- the support substrate 12 may be separated or removed.
- the fact that these methods can be adopted for removing the support substrate 12 is the same in the later-described removing step.
- the wafer 11 in the above-mentioned reinforcing wafer 11R does not have a wiring structure including an insulating film and a wiring pattern on the element forming surface 11a side, after the removing step, wiring is performed on the element forming surface 11a of the wafer 11. The structure is formed. The same is true after the removal step described later.
- FIG. 18A for example, a wafer multi-layered body 1Y is formed from a predetermined number of wafer two-layer bodies 1X that have undergone the removal process (multilayering process).
- FIG. 18A exemplifies a case where a wafer multi-layered body 1Y is formed from two wafer two-layered bodies 1Xa obtained through the removing step shown in FIG. 18A.
- the element forming surfaces 11a of the wafer 11 exposed through the removing process in the wafer two-layer body 1X are joined together.
- the adhesive layer 14 is formed on the element forming surface 11a of the wafer 11 in one of the two wafer two-layer bodies 1X that has undergone the removal process, and the adhesive layer 14 is formed between the two element forming surfaces 11a.
- the two wafer two-layer bodies 1X are bonded to each other and the adhesive layer 14 is cured.
- one or both of the two element formation surfaces 11a, which are the surfaces to be joined are previously combined with the silane coupling agent from the viewpoint of improving the adhesion with the adhesive layer 14.
- the number of stacked wafers of the multi-wafer stack 1Y formed in this step is four or more, and is determined according to the number of stacked semiconductor elements in the semiconductor device which is the manufacturing target.
- the element forming surfaces 11a of the wafer 11 exposed through the removing step are bonded to each other. It is also possible to form the multi-wafer laminated body 1Y (the number of laminated wafers is 6) shown in FIG.
- the adhesive layer 14 used for forming the wafer multi-layered body 1Y is for realizing a bonded state between the wafers 11 and is made of a thermosetting adhesive.
- the configuration of the adhesive layer 14 and the bonding method and bonding conditions between the wafers 11 via the adhesive layer 14 are the same as those described above regarding the adhesive layer 14 used for forming the wafer two-layer body 1X. Is.
- the support substrate 12 located at one end in the stacking direction of the wafer multi-stack 1Y that has undergone the above-described multilayering process is removed (after the multilayering process). Removal process).
- the temporary adhesion state with the predetermined wafer 11 is released after the multi-layering process and the support substrate 12 is removed is preferable from the viewpoint of handling the thin wafer 11 after the thinning process.
- the through electrode 15 is formed as shown in FIG. 20B (through electrode forming step).
- the through electrode 15 is for electrically connecting the semiconductor elements formed on different wafers 11 in the multi-wafer stack 1Y.
- the penetrating electrode 15 includes, for example, formation of an opening that penetrates all the wafers 11 and the adhesive layer 14, formation of an insulating film (not shown) on the inner wall surface of the opening, and a barrier layer ( (Not shown), a seed layer (not shown) for electroplating on the surface of the barrier layer, and a conductive material such as copper filled in the opening by electroplating. .
- the method described in JP-A-2016-4835 may be used to form the through electrode 15.
- the formed through electrode 15 electrically connects the wiring structure (not shown) formed on the element forming surface 11a side of each wafer 11 to each other.
- the other supporting substrate 12 is removed from the multi-layered wafer 1Y (removing step after the through electrode forming step).
- a semiconductor device having a three-dimensional structure in which semiconductor elements are integrated in the thickness direction can be manufactured.
- This semiconductor device may be diced into individual pieces.
- the support substrate 12 located at one end in the stacking direction of the multi-layered wafer 1Y that has undergone the above-described multilayering process is removed (removal process after the multilayering process).
- FIG. 21B exemplifies a case where the wafer two-layer body 1Xa obtained through the removing step shown in FIG. 18A is subjected to an additional multi-layering step.
- the adhesive layer 14 is formed on the two element forming surfaces 11a which are the joining target surfaces, and the two element forming surfaces 11a side are formed. The two are bonded together via the adhesive layer 14, and the adhesive layer 14 is cured to bond the two element forming surfaces 11a.
- one or both of the two element formation surfaces 11a, which are the surfaces to be joined are previously combined with the silane coupling agent from the viewpoint of improving the adhesion with the adhesive layer 14. May be applied (silane coupling agent treatment).
- FIG. 22 shows, as an example, a wafer multi-layered product 1Y obtained by performing the series of processes twice.
- a step of removing the support substrate 12 located at one end in the stacking direction of the wafer multi-stack 1Y that has undergone the final additional multilayering step (removal step after the final additional multilayering step. )
- the step of forming the through electrode 15 in the multi-wafer multilayer body 1Y, and the step of removing the other supporting substrate 12 from the multi-wafer multilayer body 1Y (removal step after the through electrode forming step).
- the method of forming the through electrode 15 is specifically the same as that described above with reference to FIG.
- This semiconductor device may be diced into individual pieces.
- Each of the above-mentioned joinings between the wafers 11 in the present semiconductor device manufacturing method that is, joining between the element forming surfaces 11a side and joining between the back surface 11b sides of the wafer 11 is direct joining instead of adhesive joining.
- Direct joining means a joining method in which a resin-based adhesive material is not used. Examples of such direct bonding include so-called room temperature bonding, direct bonding of an oxide film through an oxide film provided on the wafer surface such as an element forming surface, and direct electrode-to-electrode bonding when the wafer surface has an exposed electrode. Bonding (for example, Cu-Cu bonding between Cu electrode pads) can be mentioned.
- the wafer two-layer body 1X is formed. That is, the wafer two-layer body 1X formed in the bonding process has a laminated structure in which the back surfaces 11b of the wafers 11 are bonded to each other and are symmetrical in the thickness direction.
- the wafer two-layer body 1X (wafer laminate) having a symmetrical laminated structure in the thickness direction is less likely to warp.
- the sides are bonded (face-to-face bonding) to form a multi-wafer stack 1Y having four or more stacked wafers.
- the formed multi-layered wafer 1Y has a symmetrical laminated structure in the thickness direction in which the element formation surfaces 11a exposed in the two-layered wafer 1X are joined together.
- the multi-wafer stack 1Y shown in FIG. 19A includes two support substrates 12 and four thin wafers 11 interposed therebetween, and two back-to-back joints in the stack thickness direction.
- the multi-wafer laminate 1Y shown in FIG. 19B includes two support substrates 12 and six thin wafers 11 interposed therebetween, and three back-to-back layers in the laminate thickness direction.
- the back joint and the two face-to-face joints are symmetrically located, which is a laminated structure symmetrical in the thickness direction.
- the multi-wafer laminated body 1Y (wafer laminated body) having a symmetrical laminated structure in the thickness direction is less likely to warp.
- the present semiconductor device manufacturing method is suitable for manufacturing a semiconductor device while suppressing the warpage of the wafer stack.
- a thinning step of thinning the wafer 11 by grinding the back surface 11b side of the wafer 11 to be stacked is performed.
- the wafer 11 was bonded to the supporting substrate 12 via the temporary adhesive layer 13 as described above. In this state, it is subjected to a thinning process. Then, in the bonding process described above with reference to FIGS.
- the back surface 11b sides of the thin wafers 11 of the two reinforcing wafers 11R that have undergone such a thinning process are bonded to each other and the wafers are bonded to each other.
- the two-layer body 1X is formed.
- the present semiconductor device manufacturing method including such a configuration is suitable for forming a thin wafer 11 into multiple layers.
- the present semiconductor device manufacturing method is suitable for multilayering thin wafers while suppressing the warp of the wafer stack.
- the semiconductor elements can be appropriately electrically connected to each other in a short distance. Therefore, the formation of the through electrode 15 is suitable for realizing efficient digital signal processing in a manufactured semiconductor device, suitable for suppressing attenuation of a high frequency signal, and suppressing power consumption. It is also suitable for this.
- the adhesive bonding performed in the above-described bonding process as shown in FIG. 17 and the adhesive bonding performed in the above-described multi-layering process as shown in FIG. 19 are bonded on the wafer 11 as compared with direct bonding. It is preferable from the viewpoint that the flatness required for the surface is low. In direct bonding, for example, a high level of flatness on the order of nanometers is required for the wafer bonding surface.
- the formed adhesive layer can exert a function of substantially absorbing and reducing / eliminating deviation from the ideal plane of the wafer bonding surface and inclination, so that the direct bonding is performed. The requirement for the flatness of the wafer bonding surface is relaxed in comparison with. Such a configuration is preferable from the viewpoint of easiness of manufacturing a semiconductor device manufactured through the multi-layering of the thin wafer 11, and further from the viewpoint of improving the yield of manufacturing the semiconductor device.
- the curing temperature for forming the adhesive layer 14 is lowered to prevent damage to the elements in the wafer to be adhered. Suitable to suppress.
- ⁇ Preparation of adhesive 100 parts by mass of an epoxy group-containing polyorganosilsesquioxane obtained as described below, 115 parts by mass of propylene glycol monomethyl ether acetate, and an antimony sulfonium salt (trade name "SI-150L", Sanshin Chemical Industry Co., Ltd.) 0.44 parts by mass (as a solid content) and 0.05 parts by mass of (4-hydroxyphenyl) dimethylsulfonium methylsulfite (trade name "San-Aid SI auxiliary”, manufactured by Sanshin Chemical Industry Co., Ltd.).
- SI-150L an antimony sulfonium salt
- 4-hydroxyphenyl) dimethylsulfonium methylsulfite trade name "San-Aid SI auxiliary", manufactured by Sanshin Chemical Industry Co., Ltd.
- each first wafer laminated body first, a first silicon wafer and a reinforcing second silicon wafer were prepared.
- the first silicon wafer has a diameter of 300 mm, a thickness of 775 ⁇ m, and has one surface treated with a silane coupling agent.
- a silane coupling agent trade name "KBE403", manufactured by Shin-Etsu Chemical Co., Ltd.
- Heating at 120 ° C. for 5 minutes was performed.
- the reinforced second silicon wafer was manufactured as follows.
- a composition for forming a temporary adhesive layer is applied onto a silicon substrate (diameter 300 mm, thickness 775 ⁇ m), which is a supporting substrate, by spin coating to form a temporary adhesive composition layer, and the temporary adhesive composition layer is formed at 200 ° C. for 2 minutes. Was heated and then heated at 230 ° C. for 4 minutes to dry the composition layer to form a temporary adhesive layer.
- the composition for forming the temporary adhesive layer was prepared by adding 0.24 parts by mass of diethylene glycol divinyl ether and a p-hydroxystyrene / styrene copolymer (trade name "Marcalinker CST-50", a mole of p-hydroxystyrene and styrene).
- the ratio is 50:50, the weight average molecular weight is 4400, the softening point is 150 ° C., 5.4 parts by mass of Maruzen Petrochemical Co., Ltd., and polyvinyl butyral resin (trade name “ESREC KS-1”, molecular weight is 2.7).
- ⁇ 10 4 a softening point of 200 ° C. for the thermoplastic resin, and manufactured by Sekisui Chemical Co., Ltd.) 1.8 parts by weight of polycaprolactone (trade name "PLACCEL H1P", weight average molecular weight 10000, softening point of 100 ° C.
- Thermoplastic resin manufactured by Daicel Corporation 1.8 parts by mass and trans-cinnamic acid (pKa 4.44, manufactured by Wako Pure Chemical Industries, Ltd.) as a polymerization accelerator 0
- a fluorine-based oligomer trade name "F-554", manufactured by DIC Corporation
- 22 parts by mass of cyclohexanone as a solvent. Is.
- the silicon substrate and the second silicon wafer (diameter 300 mm, thickness 775 ⁇ m) were bonded together via a temporary adhesive layer.
- the silicon substrate and the second silicon wafer are bonded together via a temporary adhesive layer while applying pressure at a temperature of 150 ° C. and a pressure of 3000 g / cm 2 , and then heated at 230 ° C. for 5 minutes. Then, the temporary adhesive layer was solidified, and the silicon substrate and the second silicon wafer were bonded via the temporary adhesive layer.
- the second silicon wafer supported by the silicon substrate was ground using a grind device (manufactured by DISCO Co., Ltd.) to reduce the thickness of the second silicon wafer to 10 ⁇ m. .
- the silane coupling agent-treated surface (first surface) of the first silicon wafer is coated with the above-mentioned adhesive containing an epoxy group-containing polyorganosilsesquioxane by spin coating.
- the first silicon wafer with the adhesive coating film was heated at 80 ° C. for 4 minutes, and subsequently heated at 100 ° C. for 2 minutes.
- the adhesive was dried on the first surface of the first silicon wafer to form an adhesive layer having a thickness of 2.5 ⁇ m.
- the first silicon wafer with the adhesive layer and the thinned second silicon wafer in the reinforcing second silicon wafer described above are bonded while being pressed through the adhesive layer on the first silicon wafer. Then, heating was performed at 150 ° C. for 30 minutes, and then heating was performed at 170 ° C. for 30 minutes, whereby the adhesive layer was cured and both silicon wafers were bonded. The bonding was performed under the conditions of a temperature of 50 ° C. and a pressure of 3000 g / cm 2 .
- the temporary adhesion state by the temporary adhesive layer between the silicon substrate as the support substrate and the thinned second silicon wafer is released,
- the silicon substrate was removed from the thinned second silicon wafer. Specifically, after the heat treatment at 230 ° C. for 5 minutes, the silicon substrate is slid at a relative speed of 1 mm / sec with respect to the thinned second silicon wafer to remove the thinned second silicon wafer or the thinned second silicon wafer.
- the silicon substrate was removed from the containing wafer stack (removal step).
- the temporary adhesive residue on the thinned second silicon wafer was removed by washing with propylene glycol monomethyl ether.
- the temporary adhesive and the adhesive containing the polymerizable group-containing polyorganosilsesquioxane were used to prepare the first wafer laminate of this example.
- the thinned second silicon wafer side surface (the surface exposed through the above-mentioned removing step) of each of the first wafer laminated bodies produced as described above is formed.
- a silane coupling agent treatment was applied.
- spin coating of a silane coupling agent (trade name “KBE403”, manufactured by Shin-Etsu Chemical Co., Ltd.) on the surface of the thinned second silicon wafer was performed, and then at 120 ° C. for 5 minutes. Was heated.
- the above-mentioned adhesive containing epoxy group-containing polyorganosilsesquioxane was spin-coated on the silane coupling agent-treated surface (second surface) of the thinned second silicon wafer in one of the first wafer laminates.
- the first wafer laminate with this adhesive coating was heated at 80 ° C. for 4 minutes, followed by heating at 100 ° C. for 2 minutes.
- the adhesive was dried on the second surface of the first wafer laminate to form an adhesive layer having a thickness of 2.5 ⁇ m.
- a multi-layering process was performed. Specifically, after bonding the first wafer laminated body with the adhesive layer and the silane coupling agent-treated surface of the other first wafer laminated body while applying pressure through the adhesive layer, 150 C. for 30 minutes, followed by 170.degree. C. for 30 minutes, which cures the adhesive layer and bonds the two first wafer stacks (Face-to-Face). Joining). The bonding was performed under the conditions of a temperature of 50 ° C. and a pressure of 3000 g / cm 2 . As described above, the second wafer laminated body of this example was manufactured.
- the second wafer laminated body produced through the multi-layering process was subjected to SEMI standard (specifically SEMI MF1451) using a shape measuring device (trade name “LTV-3000”, manufactured by Kobelco Kaken Co., Ltd.). It was 11 ⁇ m when the SORI (warp amount) specified in ⁇ 0707) was measured.
- the least-squares reference plane is calculated from the surface shape data of the measurement object obtained by correcting the deflection of the measurement object by its own weight, and the maximum value of the deviation from the least-squares reference plane in the surface shape data.
- the amount of warp corresponds to the difference between the minimum value and the minimum value.
- the amount of warpage was similarly measured using a shape measuring device (trade name "LTV-3000", manufactured by Kobelco Kaken Co., Ltd.). there were.
- LTV-3000 manufactured by Kobelco Kaken Co., Ltd.
- the adhesive prepared as described above was applied on a silicon substrate (diameter 300 mm, thickness 775 ⁇ m) by spin coating to form an adhesive coating film.
- the adhesive used for one spin coating was 20 g, and the rotation speed in the spin coating was 1200 rpm.
- the adhesive coating film on the substrate was heated at 150 ° C. for 30 minutes and then at 170 ° C. for 30 minutes, whereby a cured coating film was formed on the substrate.
- the thickness of the formed coating film was measured using a fine shape measuring machine (trade name “Surfcoder ET4000A”, manufactured by Kosaka Laboratory Ltd.), and it was 2.5 ⁇ m.
- the above-mentioned wafer laminate according to the example includes such a cured coating film as an adhesive layer for bonding the first and second silicon wafers.
- a laminated structure including a wafer having an element formation surface and a back surface opposite thereto, a support substrate, and a temporary adhesive layer for forming a temporary adhesion state between the element formation surface side of the wafer and the support substrate
- Preparing a reinforced wafer having A thinning step of forming a thinned wafer by grinding the wafer in the reinforcing wafer from the back surface side thereof;
- a removing step of removing the supporting substrate from the wafer stack A method of manufacturing a semiconductor device, comprising: a step of forming a wafer laminated body by joining a surface of the wafer laminated body that has undergone the removing step and a surface of another wafer laminated body, A method for manufacturing a semiconductor device, wherein the wafer laminated body obtained through
- a laminated structure including a wafer having an element formation surface and a back surface opposite thereto, a support substrate, and a temporary adhesive layer for forming a temporary adhesion state between the element formation surface side of the wafer and the support substrate Preparing two reinforcing wafers having A thinning step of forming a thinned wafer by grinding the wafer in the reinforcing wafer from the back surface side thereof; A first wafer laminated body in which the element forming surface side of a base wafer having an element forming surface and a back surface opposite to the element forming surface and the back surface side of the thinned wafer of the reinforcing wafer are bonded with an adhesive.
- [Appendix 3] The method of manufacturing a semiconductor device according to [Appendix 2], wherein the thickness of the wafer is 1000 ⁇ m or less, 900 ⁇ m or less, or 800 ⁇ m or less, and 500 ⁇ m or more.
- the supporting substrate is a silicon wafer or a glass wafer, and the thickness thereof is 300 ⁇ m or more, 500 ⁇ m or more, or 700 ⁇ m or more, and 800 ⁇ m or less, [Appendix 2] or [Appendix 3]. Method.
- [Appendix 5] A laminated structure including a wafer having an element formation surface and a back surface opposite thereto, a support substrate, and a temporary adhesive layer for forming a temporary adhesion state between the element formation surface side of the wafer and the support substrate Providing at least one additional stiffening wafer having Grinding the wafer in each additional reinforcing wafer from its backside to form a thinned wafer; At least one additional bonding step of bonding the back surface side of the thinned wafer in the additional reinforcing wafer to the element formation surface side of the thinned wafer in the first wafer stacked body via an adhesive; A supplementary step of removing the support substrate in the first wafer laminated body that has undergone the additional bonding step, before the multi-layering step, in any one of [Appendix 2] to [Appendix 4].
- [Appendix 7] A penetration that extends through the first wafer stack from the device forming surface of the thinned wafer located at one end in the stacking direction of each first wafer stack to the device forming surface of the base wafer at the other end. 6.
- the semiconductor device manufacturing method according to any one of [Supplementary Note 2] to [Supplementary Note 5], which includes a step of forming an electrode before the step of forming the multilayer.
- [Appendix 8] 8. The semiconductor device manufacturing method according to any one of [Supplementary note 2] to [Supplementary note 7], further including a step of thinning the base wafer by grinding the back surface side of the base wafer.
- the temporary adhesive for forming the temporary adhesive layer is a polyvalent vinyl ether compound and the polyvalent vinyl ether having two or more hydroxy groups or carboxy groups capable of reacting with the vinyl ether group to form an acetal bond.
- the semiconductor device manufacturing method according to any one of [Supplementary Note 2] to [Supplementary Note 10], which contains a compound capable of forming a polymer with the compound and a thermoplastic resin.
- [Appendix 12] The semiconductor device manufacturing according to [Appendix 11], wherein the polyvalent vinyl ether compound is at least one compound selected from the group consisting of 1,4-butanediol divinyl ether, diethylene glycol divinyl ether, and triethylene glycol divinyl ether. Method.
- an unsaturated aliphatic hydrocarbon a saturated or unsaturated alicyclic hydrocarbon, an aromatic hydrocarbon, a heterocyclic compound, or a combination of these bonded through a single bond or a linking group (n 2 + 2) and a constitutional unit represented by.) representing the number of the removed group a hydrogen atom, a chain olefins, cyclic olefins, aromatic vinyl compounds, unsaturated carboxylic acid esters, carboxylic acid
- the compound capable of forming a polymer with a polyvalent vinyl ether compound having two or more hydroxy groups or carboxy groups capable of forming an acetal bond by reacting with the vinyl ether group of the polyvalent vinyl ether compound is a styrene-based polymer, )
- [Appendix 15] The compound having two or more hydroxy groups or carboxy groups capable of reacting with the vinyl ether group of the polyvalent vinyl ether compound to form an acetal bond and forming a polymer with the polyvalent vinyl ether compound is represented by the above formula (b-1).
- thermoplastic resin is at least one selected from the group consisting of polyvinyl acetal-based resins, polyester-based resins, polyurethane-based resins, and polyamide-based resins.
- Appendix 11] to [Appendix 15] A method for manufacturing a semiconductor device as described above.
- the bonding step includes a curing treatment for curing the adhesive at a temperature lower than the softening point of the polymer, 17.
- [Appendix 18] A laminated structure including a wafer having an element formation surface and a back surface opposite thereto, a support substrate, and a temporary adhesive layer for forming a temporary adhesion state between the element formation surface side of the wafer and the support substrate Preparing at least four reinforcing wafers having In each reinforcing wafer, a thinning step of thinning the wafer by grinding the back surface side of the wafer, A bonding step of bonding the back surface sides of the wafers in the two reinforcing wafers that have undergone the thinning step to form at least two wafer bilayers with the supporting substrate; In each wafer bilayer, at least one supporting substrate is removed and removed,
- [Appendix 19] 19. The method of manufacturing a semiconductor device according to [Appendix 18], wherein the thickness of the wafer is 1000 ⁇ m or less, 900 ⁇ m or less, or 800 ⁇ m or less, and 500 ⁇ m or more.
- the support substrate is a silicon wafer or a glass wafer, and the thickness thereof is 300 ⁇ m or more, 500 ⁇ m or more, or 700 ⁇ m or more, and 800 ⁇ m or less, [Supplementary note 18] or [Supplementary note 19]. Method.
- [Appendix 21] 21 The method of manufacturing a semiconductor device according to any one of [Supplementary Note 18] to [Supplementary Note 20], further including a step of removing a support substrate located at one end in the stacking direction of the multi-wafer stack.
- [Appendix 22] Bonding the element formation surface side of the wafer, which is exposed at the one end in the stacking direction of the wafer multi-layered body, to the exposed element formation surface side of the wafer two-layered body after the removal step,
- [Appendix 23] A step of forming a penetrating electrode extending through the wafer multi-layered body from the element formation surface of the wafer located at one end in the stacking direction of the wafer multi-layered body to the element formation surface of the wafer located at the other end.
- the semiconductor device manufacturing method according to any one of [Supplementary note 18] to [Supplementary note 22].
- [Appendix 25] 25 The method for manufacturing a semiconductor device according to [Appendix 24], wherein the polymerizable group-containing polyorganosilsesquioxane is an epoxy group-containing polyorganosilsesquioxane.
- the adhesive is applied to one or both of the two back surfaces which are the surfaces to be bonded, the back surfaces are bonded together via the adhesive, and the adhesive is bonded after the bonding.
- [Appendix 27] 27.
- the bonding is performed at a temperature of room temperature or higher and 80 ° C. or lower, and the adhesive is cured at a temperature of 30 to 200 ° C. after the bonding, [Appendix 26] or [Appendix 27].
- [Appendix 30] 30 The method of manufacturing a semiconductor device according to [Appendix 29], wherein the polymerizable group-containing polyorganosilsesquioxane is an epoxy group-containing polyorganosilsesquioxane.
- the adhesive is applied to one or both of the two element forming surfaces which are the surfaces to be joined, and the element forming surfaces are bonded together via the adhesive, and the bonding is performed.
- [Appendix 32] The semiconductor device according to [Appendix 31], wherein in the multi-layering step, a silane coupling agent treatment is performed on one or both of the two element formation surfaces, which are bonding surfaces, before applying the adhesive. Production method.
- the laminating is performed at a temperature of room temperature or higher and 80 ° C. or lower, and the adhesive is cured at a temperature of 30 to 200 ° C. after the laminating, [Appendix 31] or [Appendix 32].
- the temporary adhesive for forming the temporary adhesive layer is a polyvalent vinyl ether compound and the polyvalent vinyl ether having two or more hydroxy groups or carboxy groups capable of reacting with the vinyl ether group to form an acetal bond.
- the compound having two or more hydroxy groups or carboxy groups capable of reacting with the vinyl ether group of the polyvalent vinyl ether compound to form an acetal bond and forming a polymer with the polyvalent vinyl ether compound is represented by the above formula (b) (
- X represents a hydroxy group or a carboxy group
- n 2 X's may be the same as or different from each other
- n 2 represents an integer of 1 or more
- Z 2 is saturated.
- an unsaturated aliphatic hydrocarbon a saturated or unsaturated alicyclic hydrocarbon, an aromatic hydrocarbon, a heterocyclic compound, or a combination of these bonded through a single bond or a linking group (n 2 + 2) and a constitutional unit represented by.) representing the number of the removed group a hydrogen atom, a chain olefins, cyclic olefins, aromatic vinyl compounds, unsaturated carboxylic acid esters, carboxylic acid
- the compound capable of forming a polymer with a polyvalent vinyl ether compound having two or more hydroxy groups or carboxy groups capable of forming an acetal bond by reacting with the vinyl ether group of the polyvalent vinyl ether compound is a styrene-based polymer, )
- thermoplastic resin is at least one selected from the group consisting of polyvinyl acetal-based resin, polyester-based resin, polyurethane-based resin, and polyamide-based resin.
- Appendix 34] to [Appendix 38] A method for manufacturing a semiconductor device as described above.
- X, Y Wafer stack S Support substrate 1 Wafer 1T Thinned wafers 1a, 3a Element forming surfaces 1b, 3b Back surface 1R Reinforcement wafer 3 Wafer (base wafer) 2 Temporary Adhesive Layer 4 Adhesive 5 Through Electrode 11R Reinforcement Wafer 11 Wafer 11a Element Forming Surface 11b Backside 12 Supporting Substrate 13 Temporary Adhesive Layer 14 Adhesive Layer 15 Through Electrode 1X Wafer Bilayer 1Y Wafer Multilayer
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Abstract
Description
Z3-COOH (d)
(式中、Z3はカルボキシ基以外の置換基を有していてもよい、飽和もしくは不飽和脂肪族炭化水素、飽和もしくは不飽和脂環式炭化水素、および芳香族炭化水素からなる群より選択される一種、の構造式から1個の水素原子を除去した基を表す)
Z4-OH (e)
(式中、Z4はヒドロキシ基以外の置換基を有していてもよい芳香族炭化水素の構造式から1個の水素原子を除去した基を表す)
<フロー条件>
圧力:100kg/cm2
スピード:6℃/分
ノズル:1mmφ×10mm
溶媒:重クロロホルム
積算回数:1800回
測定温度:25℃
測定温度:40℃
溶離液:テトラヒドロフラン(THF)
試料濃度:0.1~0.2質量%
流量:1mL/分
標準試料:ポリスチレン
検出器:UV-VIS検出器(商品名「SPD-20A」,株式会社島津製作所製)
後記のようにして得られるエポキシ基含有ポリオルガノシルセスキオキサン100質量部と、プロピレングリコールモノメチルエーテルアセテート115質量部と、アンチモン系スルホニウム塩(商品名「SI-150L」,三新化学工業株式会社製)0.45質量部(固形分として)と、(4-ヒドロキシフェニル)ジメチルスルホニウムメチルサルファイト(商品名「サンエイドSI助剤」,三新化学工業株式会社製)0.05質量部とを混合し、接着剤を得た。
還流冷却器と、窒素ガス導入管と、撹拌装置と、温度計とを備えた300mLのフラスコ内で、窒素ガスを導入しながら、2-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン161.5mmol(39.79g)と、フェニルトリメトキシシラン9mmol(1.69g)と、溶媒としてのアセトン165.9gとを混合して50℃に昇温した。次に、当該混合物に、5%炭酸カリウム水溶液4.7g(炭酸カリウムとして1.7mmol)を5分かけて滴下し、続いて水1700mmol(30.6g)を20分かけて滴下した。滴下操作の間、混合物に著しい温度上昇は生じなかった。当該滴下操作の後、フラスコ内に窒素ガスを導入しながら、50℃で4時間、重縮合反応を行った。重縮合反応後の反応溶液中の生成物を分析したところ、数平均分子量は1900であり、分子量分散度は1.5であった。そして、静置されて冷却された反応溶液について、相分離によって生じる下層液(水相)が中性になるまで水洗を繰り返した後、上層液を分取し、1mmHgおよび40℃の条件で、溶媒量が25質量%になるまで上層液から溶媒を留去し、無色透明の液状の生成物(エポキシ基含有ポリオルガノシルセスキオキサン)を得た。
以下のようにして、二つの第1のウエハ積層体を作製した。
以下のようにして、二つの第1のウエハ積層体を接着剤接合して第2のウエハ積層体を作製した。
多層化工程を経て作製された上述の第2のウエハ積層体について、形状測定装置(商品名「LTV-3000」,株式会社コベルコ科研製)を使用して、SEMI規格(具体的にはSEMI MF1451-0707)に定められるSORI(反り量)を測定したところ、11μmであった。本測定においては、測定対象物の自重たわみに関する補正を経て得られる当該測定対象物の表面形状データから最小二乗参照平面が算出され、前記表面形状データにおける当該最小二乗参照平面からの偏差の最大値と最小値との差分に、前記反り量は相当する。一方、多層化工程前の上述の第1のウエハ積層体について、形状測定装置(商品名「LTV-3000」,株式会社コベルコ科研製)を使用して同様に反り量を測定したところ、47μmであった。厚さ方向において対称的な積層構成を有する第2のウエハ積層体では、第1のウエハ積層体よりも反りが抑制されていた。
上述のようにして作製された接着剤をシリコン基板(直径300mm,厚さ775μm)上にスピンコーティングによって塗布して接着剤塗膜を形成した。1回のスピンコーティングに供して使用した接着剤は20gであり、スピンコーティングにおける回転速度は1200rpmとした。そして、基板上の接着剤塗膜に対し、150℃で30分間の加熱を行い、続いて170℃で30分間の加熱を行い、これにより、硬化した塗膜を基材上に形成した。形成された塗膜について、微細形状測定機(商品名「サーフコーダ ET4000A」,株式会社小坂研究所製)を使用して厚さを測定したところ、2.5μmであった。実施例に係る上述のウエハ積層体は、このような硬化塗膜を、第1および第2シリコンウエハを接合する接着剤層として含む。
素子形成面およびこれとは反対の裏面を有するウエハ、支持基板、並びに、前記ウエハの前記素子形成面側および前記支持基板の間の、仮接着状態形成用の仮接着剤層、を含む積層構造を有する補強ウエハを用意する、用意工程と、
前記補強ウエハにおける前記ウエハをその裏面側から研削して薄化ウエハを形成する、薄化工程と、
前記補強ウエハの面と、素子形成面およびこれとは反対の裏面を有する他のウエハの面とを接合してウエハ積層体を形成する、接合工程と、
前記ウエハ積層体において支持基板の取り外しを行う、取外し工程と、
前記取外し工程を経た前記ウエハ積層体の面と、他のウエハ積層体の面とを接合してウエハ積層体を形成する、多層化工程と、を含む半導体装置製造方法であって、
多層化工程を経て得られるウエハ積層体が、その厚さ方向において対称的な積層構成を有するウエハ積層体である半導体装置製造方法。
素子形成面およびこれとは反対の裏面を有するウエハ、支持基板、並びに、前記ウエハの前記素子形成面側および前記支持基板の間の、仮接着状態形成用の仮接着剤層、を含む積層構造を有する二つの補強ウエハを用意する、用意工程と、
前記補強ウエハにおける前記ウエハをその裏面側から研削して薄化ウエハを形成する、薄化工程と、
素子形成面およびこれとは反対の裏面を有するベースウエハの前記素子形成面側と、前記補強ウエハの前記薄化ウエハの裏面側とを、接着剤を介して接合して第1のウエハ積層体を形成する、前記補強ウエハごとに行われる、接合工程と、
各第1のウエハ積層体において支持基板の取り外しを行う、取外し工程と、
前記取外し工程を経た二つの前記第1のウエハ積層体における、前記薄化ウエハの素子形成面側どうし又は前記ベースウエハの裏面側どうしを、接着剤を介して接合して第2のウエハ積層体を形成する、多層化工程と、を含む、〔付記1〕に記載の半導体装置製造方法。
前記ウエハの厚さは、1000μm以下、900μm以下、又は800μm以下であり、500μm以上である、〔付記2〕に記載の半導体装置製造方法。
前記支持基板は、シリコンウエハやガラスウエハであり、その厚さは、300μm以上、500μm以上、又は700μm以上であり、800μm以下である、〔付記2〕または〔付記3〕に記載の半導体装置製造方法。
素子形成面およびこれとは反対の裏面を有するウエハ、支持基板、並びに、前記ウエハの前記素子形成面側および前記支持基板の間の、仮接着状態形成用の仮接着剤層、を含む積層構造を有する少なくとも一つの追加の補強ウエハを用意する工程と、
各追加の補強ウエハにおける前記ウエハをその裏面側から研削して薄化ウエハを形成する工程と、
前記追加の補強ウエハにおける前記薄化ウエハの裏面側を、第1のウエハ積層体における薄化ウエハの素子形成面側に接着剤を介して接合する、少なくとも一つの追加の接合工程と、
前記追加の接合工程を経た第1のウエハ積層体における支持基板の取り外しを行う取外し工程と、を前記多層化工程よりも前に含む、〔付記2〕から〔付記4〕のいずれか一つに記載の半導体装置製造方法。
前記第2のウエハ積層体において複数の薄化ウエハと少なくとも一つのベースウエハとを貫通して延びる貫通電極を形成する工程を更に含む、〔付記2〕から〔付記5〕のいずれか一つに記載の半導体装置製造方法。
各第1のウエハ積層体における積層方向の一端に位置する薄化ウエハの素子形成面から他端に位置するベースウエハの素子形成面に至るまで当該第1のウエハ積層体内を貫通して延びる貫通電極を形成する工程を前記多層化工程よりも前に含む、〔付記2〕から〔付記5〕のいずれか一つに記載の半導体装置製造方法。
前記ベースウエハにおける前記裏面側に対する研削によって当該ベースウエハを薄化する工程を更に含む、〔付記2〕から〔付記7〕のいずれか一つに記載の半導体装置製造方法。
前記接着剤は、重合性基含有ポリオルガノシルセスキオキサンを含有する、〔付記2〕から〔付記8〕のいずれか一つに記載の半導体装置製造方法。
前記重合性基含有ポリオルガノシルセスキオキサンは、エポキシ基含有ポリオルガノシルセスキオキサンである、〔付記9〕に記載の半導体装置製造方法。
前記仮接着剤層を形成するための仮接着剤は、多価ビニルエーテル化合物と、そのビニルエーテル基と反応してアセタール結合を形成可能なヒドロキシ基またはカルボキシ基を二つ以上有して前記多価ビニルエーテル化合物と重合体を形成しうる化合物と、熱可塑性樹脂とを含有する、〔付記2〕から〔付記10〕のいずれか一つに記載の半導体装置製造方法。
前記多価ビニルエーテル化合物は、1,4-ブタンジオールジビニルエーテル、ジエチレングリコールジビニルエーテル、およびトリエチレングリコールジビニルエーテルからなる群より選択される少なくとも一種の化合物である、〔付記11〕に記載の半導体装置製造方法。
前記多価ビニルエーテル化合物のビニルエーテル基と反応してアセタール結合を形成可能なヒドロキシ基またはカルボキシ基を二つ以上有して多価ビニルエーテル化合物と重合体を形成しうる化合物は、上記式(b)(式中、Xはヒドロキシ基またはカルボキシ基を表す。n2個のXは、互いに同一であってもよいし、互いに異なってもよい。n2は1以上の整数を表す。Z2は、飽和もしくは不飽和脂肪族炭化水素、飽和もしくは不飽和脂環式炭化水素、芳香族炭化水素、複素環式化合物、またはこれらが単結合もしくは連結基を介して結合した結合体、の構造式から(n2+2)個の水素原子を除去した基を表す。)で表される構成単位と、鎖状オレフィン、環状オレフィン、芳香族ビニル化合物、不飽和カルボン酸エステル、カルボン酸ビニルエステル、および不飽和ジカルボン酸ジエステルからなる群より選択される少なくとも一種の重合性単量体由来の構成単位と、を含む化合物である、〔付記11〕または〔付記12〕に記載の半導体装置製造方法。
前記多価ビニルエーテル化合物のビニルエーテル基と反応してアセタール結合を形成可能なヒドロキシ基またはカルボキシ基を二つ以上有して多価ビニルエーテル化合物と重合体を形成しうる化合物は、スチレン系ポリマー、(メタ)アクリル系ポリマー、ポリビニルアルコール、ノボラック樹脂、又はレゾール樹脂である、〔付記11〕または〔付記12〕に記載の半導体装置製造方法。
前記多価ビニルエーテル化合物のビニルエーテル基と反応してアセタール結合を形成可能なヒドロキシ基またはカルボキシ基を二つ以上有して多価ビニルエーテル化合物と重合体を形成しうる化合物は、上記式(b-1)~(b-6)からなる群より選択される少なくとも一種の構成単位(繰り返し単位)を2以上有する化合物を含む化合物である、〔付記11〕または〔付記12〕に記載の半導体装置製造方法。
前記熱可塑性樹脂は、ポリビニルアセタール系樹脂、ポリエステル系樹脂、ポリウレタン系樹脂、およびポリアミド系樹脂からなる群より選択される少なくとも一種である、〔付記11〕から〔付記15〕のいずれか一つに記載の半導体装置製造方法。
前記接合工程は、前記重合体の軟化点より低い温度で前記接着剤を硬化させる硬化処理を含み、
前記取外し工程は、前記重合体の軟化点より高い温度で前記仮接着剤層を軟化させる軟化処理を含む、〔付記11〕から〔付記16〕のいずれか一つに記載の半導体装置製造方法。
素子形成面およびこれとは反対の裏面を有するウエハ、支持基板、並びに、前記ウエハの前記素子形成面側および前記支持基板の間の、仮接着状態形成用の仮接着剤層、を含む積層構造を有する少なくとも四つの補強ウエハを用意する、用意工程と、
各補強ウエハにおいて、前記ウエハの前記裏面側を研削して当該ウエハを薄化する、薄化工程と、
前記薄化工程を経た二つの補強ウエハにおける前記ウエハの前記裏面側どうしを接合して、前記支持基板を伴うウエハ二層体を少なくとも二つ形成する、接合工程と、
各ウエハ二層体において、少なくとも一つの支持基板を取り外す、取外し工程と、
少なくとも二つのウエハ二層体において前記取外し工程を経て露出したウエハの素子形成面側どうしを接合してウエハ多積層体を形成する、多層化工程と、を含む、〔付記1〕に記載の半導体装置製造方法。
前記ウエハの厚さは、1000μm以下、900μm以下、又は800μm以下であり、500μm以上である、〔付記18〕に記載の半導体装置製造方法。
前記支持基板は、シリコンウエハやガラスウエハであり、その厚さは、300μm以上、500μm以上、又は700μm以上であり、800μm以下である、〔付記18〕または〔付記19〕に記載の半導体装置製造方法。
前記ウエハ多積層体における積層方向の一端に位置する支持基板を取り外す工程を更に含む、〔付記18〕から〔付記20〕のいずれか一つに記載の半導体装置製造方法。
前記ウエハ多積層体における積層方向の一端に位置するウエハの、露出している素子形成面側に、前記ウエハ二層体において前記取外し工程を経て露出したウエハの素子形成面側を接合する、追加の多層化工程を更に含む、〔付記18〕から〔付記21〕のいずれか一つに記載の半導体装置製造方法。
前記ウエハ多積層体における積層方向の一端に位置するウエハの素子形成面から他端に位置するウエハの素子形成面に至るまで当該ウエハ多積層体内を貫通して延びる貫通電極を形成する工程を更に含む、〔付記18〕から〔付記22〕のいずれか一つに記載の半導体装置製造方法。
前記接合工程における前記裏面側どうしの接合は、熱硬化性樹脂としての重合性基含有ポリオルガノシルセスキオキサンを含有する接着剤を介して行われる、〔付記18〕から〔付記23〕のいずれか一つ記載の半導体装置製造方法。
前記重合性基含有ポリオルガノシルセスキオキサンは、エポキシ基含有ポリオルガノシルセスキオキサンである、〔付記24〕に記載の半導体装置製造方法。
前記接合工程では、接合対象面である二つの前記裏面の一方または両方に前記接着剤が塗布され、当該接着剤を介して当該裏面どうしの貼合わせが行われ、当該貼合わせ後に当該接着剤が硬化される、〔付記24〕または〔付記25〕に記載の半導体装置製造方法。
前記接合工程では、前記接着剤の塗布の前に、接合対象面である二つの前記裏面の一方または両方にシランカップリング剤処理が施される、〔付記26〕に記載の半導体装置製造方法。
前記接合工程において、前記貼合わせは室温以上かつ80℃以下の温度で行われ、当該貼合わせ後に30~200℃の温度で前記接着剤が硬化される、〔付記26〕または〔付記27〕に記載の半導体装置製造方法。
前記多層化工程における前記素子形成面側どうしの接合は、熱硬化性樹脂としての重合性基含有ポリオルガノシルセスキオキサンを含有する接着剤を介して行われる、〔付記18〕から〔付記28〕のいずれか一つに記載の半導体装置製造方法。
前記重合性基含有ポリオルガノシルセスキオキサンは、エポキシ基含有ポリオルガノシルセスキオキサンである、〔付記29〕に記載の半導体装置製造方法。
前記多層化工程では、接合対象面である二つの前記素子形成面の一方または両方に前記接着剤が塗布され、当該接着剤を介して当該素子形成面どうしの貼合わせが行われ、当該貼合わせ後に当該接着剤が硬化される、〔付記29〕または〔付記30〕に記載の半導体装置製造方法。
前記多層化工程では、前記接着剤の塗布の前に、接合対象面である二つの前記素子形成面の一方または両方にシランカップリング剤処理が施される、〔付記31〕に記載の半導体装置製造方法。
前記多層化工程において、前記貼合わせは室温以上かつ80℃以下の温度で行われ、当該貼合わせ後に30~200℃の温度で前記接着剤が硬化される、〔付記31〕または〔付記32〕に記載の半導体装置製造方法。
前記仮接着剤層を形成するための仮接着剤は、多価ビニルエーテル化合物と、そのビニルエーテル基と反応してアセタール結合を形成可能なヒドロキシ基またはカルボキシ基を二つ以上有して前記多価ビニルエーテル化合物と重合体を形成しうる化合物と、熱可塑性樹脂とを含有する、〔付記18〕から〔付記33〕のいずれか一つに記載の半導体装置製造方法。
前記多価ビニルエーテル化合物は、1,4-ブタンジオールジビニルエーテル、ジエチレングリコールジビニルエーテル、およびトリエチレングリコールジビニルエーテルからなる群より選択される少なくとも一種の化合物である、〔付記34〕に記載の半導体装置製造方法。
前記多価ビニルエーテル化合物のビニルエーテル基と反応してアセタール結合を形成可能なヒドロキシ基またはカルボキシ基を二つ以上有して多価ビニルエーテル化合物と重合体を形成しうる化合物は、上記式(b)(式中、Xはヒドロキシ基またはカルボキシ基を表す。n2個のXは、互いに同一であってもよいし、互いに異なってもよい。n2は1以上の整数を表す。Z2は、飽和もしくは不飽和脂肪族炭化水素、飽和もしくは不飽和脂環式炭化水素、芳香族炭化水素、複素環式化合物、またはこれらが単結合もしくは連結基を介して結合した結合体、の構造式から(n2+2)個の水素原子を除去した基を表す。)で表される構成単位と、鎖状オレフィン、環状オレフィン、芳香族ビニル化合物、不飽和カルボン酸エステル、カルボン酸ビニルエステル、および不飽和ジカルボン酸ジエステルからなる群より選択される少なくとも一種の重合性単量体由来の構成単位と、を含む化合物である、〔付記34〕または〔付記35〕に記載の半導体装置製造方法。
前記多価ビニルエーテル化合物のビニルエーテル基と反応してアセタール結合を形成可能なヒドロキシ基またはカルボキシ基を二つ以上有して多価ビニルエーテル化合物と重合体を形成しうる化合物は、スチレン系ポリマー、(メタ)アクリル系ポリマー、ポリビニルアルコール、ノボラック樹脂、又はレゾール樹脂である、〔付記34〕または〔付記35〕に記載の半導体装置製造方法。
前記多価ビニルエーテル化合物のビニルエーテル基と反応してアセタール結合を形成可能なヒドロキシ基またはカルボキシ基を二つ以上有して多価ビニルエーテル化合物と重合体を形成しうる化合物は、上記式(b-1)~(b-6)からなる群より選択される少なくとも一種の構成単位(繰り返し単位)を2以上有する化合物を含む化合物である、〔付記34〕または〔付記35〕に記載の半導体装置製造方法。
前記熱可塑性樹脂は、ポリビニルアセタール系樹脂、ポリエステル系樹脂、ポリウレタン系樹脂、およびポリアミド系樹脂からなる群より選択される少なくとも一種である、〔付記34〕から〔付記38〕のいずれか一つに記載の半導体装置製造方法。
S 支持基板
1 ウエハ
1T 薄化ウエハ
1a,3a 素子形成面
1b,3b 裏面
1R 補強ウエハ
3 ウエハ(ベースウエハ)
2 仮接着剤層
4 接着剤
5 貫通電極
11R 補強ウエハ
11 ウエハ
11a 素子形成面
11b 裏面
12 支持基板
13 仮接着剤層
14 接着剤層
15 貫通電極
1X ウエハ二層体
1Y ウエハ多積層体
Claims (21)
- 素子形成面およびこれとは反対の裏面を有するウエハ、支持基板、並びに、前記ウエハの前記素子形成面側および前記支持基板の間の、仮接着状態形成用の仮接着剤層、を含む積層構造を有する補強ウエハを用意する、用意工程と、
前記補強ウエハにおける前記ウエハをその裏面側から研削して薄化ウエハを形成する、薄化工程と、
前記補強ウエハの面と、素子形成面およびこれとは反対の裏面を有する他のウエハの面とを接合してウエハ積層体を形成する、接合工程と、
前記ウエハ積層体において支持基板の取り外しを行う、取外し工程と、
前記取外し工程を経た前記ウエハ積層体の面と、他のウエハ積層体の面とを接合してウエハ積層体を形成する、多層化工程と、を含む半導体装置製造方法であって、
多層化工程を経て得られるウエハ積層体が、その厚さ方向において対称的な積層構成を有するウエハ積層体である半導体装置製造方法。 - 素子形成面およびこれとは反対の裏面を有するウエハ、支持基板、並びに、前記ウエハの前記素子形成面側および前記支持基板の間の、仮接着状態形成用の仮接着剤層、を含む積層構造を有する二つの補強ウエハを用意する、用意工程と、
前記補強ウエハにおける前記ウエハをその裏面側から研削して薄化ウエハを形成する、薄化工程と、
素子形成面およびこれとは反対の裏面を有するベースウエハの前記素子形成面側と、前記補強ウエハの前記薄化ウエハの裏面側とを、接着剤を介して接合して第1のウエハ積層体を形成する、前記補強ウエハごとに行われる、接合工程と、
各第1のウエハ積層体において支持基板の取り外しを行う、取外し工程と、
前記取外し工程を経た二つの前記第1のウエハ積層体における、前記薄化ウエハの素子形成面側どうし又は前記ベースウエハの裏面側どうしを、接着剤を介して接合して第2のウエハ積層体を形成する、多層化工程と、を含む、請求項1に記載の半導体装置製造方法。 - 素子形成面およびこれとは反対の裏面を有するウエハ、支持基板、並びに、前記ウエハの前記素子形成面側および前記支持基板の間の、仮接着状態形成用の仮接着剤層、を含む積層構造を有する少なくとも一つの追加の補強ウエハを用意する工程と、
各追加の補強ウエハにおける前記ウエハをその裏面側から研削して薄化ウエハを形成する工程と、
前記追加の補強ウエハにおける前記薄化ウエハの裏面側を、第1のウエハ積層体における薄化ウエハの素子形成面側に接着剤を介して接合する、少なくとも一つの追加の接合工程と、
前記追加の接合工程を経た第1のウエハ積層体における支持基板の取り外しを行う取外し工程と、を前記多層化工程よりも前に含む、請求項2に記載の半導体装置製造方法。 - 前記第2のウエハ積層体において複数の薄化ウエハと少なくとも一つのベースウエハとを貫通して延びる貫通電極を形成する工程を更に含む、請求項2または3に記載の半導体装置製造方法。
- 各第1のウエハ積層体における積層方向の一端に位置する薄化ウエハの素子形成面から他端に位置するベースウエハの素子形成面に至るまで当該第1のウエハ積層体内を貫通して延びる貫通電極を形成する工程を前記多層化工程よりも前に含む、請求項2または3に記載の半導体装置製造方法。
- 前記ベースウエハにおける前記裏面側に対する研削によって当該ベースウエハを薄化する工程を更に含む、請求項2から5のいずれか一つに記載の半導体装置製造方法。
- 前記接着剤は、重合性基含有ポリオルガノシルセスキオキサンを含有する、請求項2から6のいずれか一つに記載の半導体装置製造方法。
- 前記仮接着剤層を形成するための仮接着剤は、多価ビニルエーテル化合物と、そのビニルエーテル基と反応してアセタール結合を形成可能なヒドロキシ基またはカルボキシ基を二つ以上有して前記多価ビニルエーテル化合物と重合体を形成しうる化合物と、熱可塑性樹脂とを含有する、請求項2から7のいずれか一つに記載の半導体装置製造方法。
- 前記接合工程は、前記重合体の軟化点より低い温度で前記接着剤を硬化させる硬化処理を含み、
前記取外し工程は、前記重合体の軟化点より高い温度で前記仮接着剤層を軟化させる軟化処理を含む、請求項8に記載の半導体装置製造方法。 - 素子形成面およびこれとは反対の裏面を有するウエハ、支持基板、並びに、前記ウエハの前記素子形成面側および前記支持基板の間の、仮接着状態形成用の仮接着剤層、を含む積層構造を有する少なくとも四つの補強ウエハを用意する、用意工程と、
各補強ウエハにおいて、前記ウエハの前記裏面側を研削して当該ウエハを薄化する、薄化工程と、
前記薄化工程を経た二つの補強ウエハにおける前記ウエハの前記裏面側どうしを接合して、前記支持基板を伴うウエハ二層体を少なくとも二つ形成する、接合工程と、
各ウエハ二層体において、少なくとも一つの支持基板を取り外す、取外し工程と、
少なくとも二つのウエハ二層体において前記取外し工程を経て露出したウエハの素子形成面側どうしを接合してウエハ多積層体を形成する、多層化工程と、を含む、請求項1に記載の半導体装置製造方法。 - 前記ウエハ多積層体における積層方向の一端に位置する支持基板を取り外す工程を更に含む、請求項10に記載の半導体装置製造方法。
- 前記ウエハ多積層体における積層方向の一端に位置するウエハの、露出している素子形成面側に、前記ウエハ二層体において前記取外し工程を経て露出したウエハの素子形成面側を接合する、追加の多層化工程を更に含む、請求項10または11に記載の半導体装置製造方法。
- 前記ウエハ多積層体における積層方向の一端に位置するウエハの素子形成面から他端に位置するウエハの素子形成面に至るまで当該ウエハ多積層体内を貫通して延びる貫通電極を形成する工程を更に含む、請求項10から12のいずれか一つに記載の半導体装置製造方法。
- 前記接合工程における前記裏面側どうしの接合は、熱硬化性樹脂としての重合性基含有ポリオルガノシルセスキオキサンを含有する接着剤を介して行われる、請求項10から13のいずれか一つに記載の半導体装置製造方法。
- 前記接合工程では、接合対象面である二つの前記裏面の一方または両方に前記接着剤が塗布され、当該接着剤を介して当該裏面どうしの貼合わせが行われ、当該貼合わせ後に当該接着剤が硬化される、請求項14に記載の半導体装置製造方法。
- 前記接合工程では、前記接着剤の塗布の前に、接合対象面である二つの前記裏面の一方または両方にシランカップリング剤処理が施される、請求項15に記載の半導体装置製造方法。
- 前記接合工程において、前記貼合わせは室温以上かつ80℃以下の温度で行われ、当該貼合わせ後に30~200℃の温度で前記接着剤が硬化される、請求項15または16に記載の半導体装置製造方法。
- 前記多層化工程における前記素子形成面側どうしの接合は、熱硬化性樹脂としての重合性基含有ポリオルガノシルセスキオキサンを含有する接着剤を介して行われる、請求項10から17のいずれか一つに記載の半導体装置製造方法。
- 前記多層化工程では、接合対象面である二つの前記素子形成面の一方または両方に前記接着剤が塗布され、当該接着剤を介して当該素子形成面どうしの貼合わせが行われ、当該貼合わせ後に当該接着剤が硬化される、請求項18に記載の半導体装置製造方法。
- 前記多層化工程では、前記接着剤の塗布の前に、接合対象面である二つの前記素子形成面の一方または両方にシランカップリング剤処理が施される、請求項19に記載の半導体装置製造方法。
- 前記多層化工程において、前記貼合わせは室温以上かつ80℃以下の温度で行われ、当該貼合わせ後に30~200℃の温度で前記接着剤が硬化される、請求項19または20に記載の半導体装置製造方法。
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