WO2010095592A1 - 半導体ウエハー接合体の製造方法、半導体ウエハー接合体および半導体装置 - Google Patents
半導体ウエハー接合体の製造方法、半導体ウエハー接合体および半導体装置 Download PDFInfo
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- WO2010095592A1 WO2010095592A1 PCT/JP2010/052193 JP2010052193W WO2010095592A1 WO 2010095592 A1 WO2010095592 A1 WO 2010095592A1 JP 2010052193 W JP2010052193 W JP 2010052193W WO 2010095592 A1 WO2010095592 A1 WO 2010095592A1
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14683—Processes or apparatus peculiar to the manufacture or treatment of these devices or parts thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/02—Containers; Seals
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
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- H01L23/02—Containers; Seals
- H01L23/10—Containers; Seals characterised by the material or arrangement of seals between parts, e.g. between cap and base of the container or between leads and walls of the container
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0203—Containers; Encapsulations, e.g. encapsulation of photodiodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
- H01L23/3107—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
- H01L23/3114—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed the device being a chip scale package, e.g. CSP
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a method for manufacturing a semiconductor wafer bonded body, a semiconductor wafer bonded body, and a semiconductor device.
- a semiconductor device typified by a CMOS sensor, a CCD sensor, or the like, a semiconductor substrate having a light receiving portion, a spacer provided on the semiconductor substrate so as to surround the light receiving portion, and a semiconductor through the spacer
- a semiconductor device having a transparent substrate bonded to a substrate is known.
- Such a semiconductor device generally includes a step of attaching an electron beam curable adhesive film (spacer forming layer) to a semiconductor wafer provided with a plurality of light receiving portions, and an electron with respect to the adhesive film through a mask.
- An object of the present invention is to prevent a mask and foreign matter from adhering to the surface of a spacer forming layer during exposure, and to manufacture a semiconductor wafer bonded body having a spacer with excellent dimensional accuracy.
- An object of the present invention is to provide a method for manufacturing a semiconductor wafer bonded body, and to provide a semiconductor wafer bonded body and a semiconductor device excellent in reliability.
- a method of manufacturing a semiconductor wafer assembly comprising a semiconductor wafer, a transparent substrate installed on the functional surface side of the semiconductor wafer, and a spacer provided between the semiconductor wafer and the transparent substrate.
- An exposure process for exposing to After the exposure, a supporting substrate removing step for removing the supporting substrate; Developing the exposed spacer forming layer and forming the spacer on the semiconductor wafer; and And a bonding step of bonding the transparent substrate to a surface of the spacer opposite to the semiconductor wafer side.
- a method of manufacturing a semiconductor wafer assembly comprising a semiconductor wafer, a transparent substrate installed on the functional surface side of the semiconductor wafer, and a spacer provided between the semiconductor wafer and the transparent substrate.
- a spacer-forming film preparation step of preparing a spacer-forming film having a sheet-like supporting substrate and a spacer-forming layer having adhesiveness provided on the supporting substrate;
- a mask is installed on the support base material side of the spacer forming film, and the mask is used to selectively select a portion of the spacer forming layer to be the spacer so that exposure light is transmitted through the support base material.
- An exposure process for exposing to After the exposure, a supporting substrate removing step for removing the supporting substrate; Developing the exposed spacer forming layer, and forming the spacer on the transparent substrate; and And a bonding step of bonding a functional surface of the semiconductor wafer to a surface of the spacer opposite to the transparent substrate side.
- thermosetting resin is an epoxy resin
- FIG. 1 is a cross-sectional view showing an example of a semiconductor device of the present invention.
- FIG. 2 is a longitudinal sectional view showing an example of the bonded semiconductor wafer of the present invention.
- FIG. 3 is a plan view showing an example of the bonded semiconductor wafer of the present invention.
- FIG. 4 is a process diagram showing an example of a method for manufacturing a semiconductor device (semiconductor wafer assembly) according to the present invention.
- FIG. 5 is a process diagram showing an example of a method for manufacturing a semiconductor device (semiconductor wafer assembly) of the present invention.
- FIG. 1 is a longitudinal sectional view showing an example of a semiconductor device of the present invention.
- the upper side in FIG. 1 is referred to as “upper” and the lower side is referred to as “lower”.
- a semiconductor device (light receiving device) 100 includes a base substrate 101, a transparent substrate 102 disposed to face the base substrate 101, a light receiving unit 103 formed on the base substrate 101, and a light receiving unit 103.
- the spacer 104 is formed on the edge of the base substrate 101 and the solder bump 106 is formed on the lower surface of the base substrate 101.
- the base substrate 101 is a semiconductor substrate, and a circuit (not shown) (an individual circuit included in a semiconductor wafer described later) is provided on the semiconductor substrate.
- the light receiving unit 103 has, for example, a configuration in which a light receiving element and a microlens array are stacked in this order from the base substrate 101 side.
- the transparent substrate 102 is disposed so as to face the base substrate 101 and has substantially the same planar dimension as that of the base substrate 101.
- the transparent substrate 102 is composed of, for example, an acrylic resin substrate, a polyethylene terephthalate resin (PET) substrate, a glass substrate, or the like.
- the spacer 104 directly bonds the microlens array provided in the light receiving unit 103 and the transparent substrate 102 at the edges thereof, and bonds the base substrate 101 and the transparent substrate 102 together.
- the spacer 104 forms a gap 105 between the light receiving unit 103 (microlens array) and the transparent substrate 102.
- the spacer 104 is arranged at the edge of the light receiving portion 103 so as to surround the center portion of the light receiving portion 103, a portion of the light receiving portion 103 surrounded by the spacer 104 is a substantial light receiving portion. Function.
- Examples of the light receiving element included in the light receiving unit 103 include a CCD (Charge Coupled Device), a CMOS (Complementary Metal Oxide Semiconductor), and the like. In this light receiving element, light received by the light receiving unit 103 is converted into an electric signal. Will be.
- CCD Charge Coupled Device
- CMOS Complementary Metal Oxide Semiconductor
- the solder bump 106 has conductivity, and is electrically connected to the wiring provided on the base substrate 101 on the lower surface of the base substrate 101. As a result, an electrical signal converted from light by the light receiving unit 103 is transmitted to the solder bump 106.
- FIG. 2 is a longitudinal sectional view showing an example of the semiconductor wafer bonded body of the present invention
- FIG. 3 is a plan view showing an example of the semiconductor wafer bonded body of the present invention.
- the semiconductor wafer bonded body 1000 is composed of a stacked body in which a semiconductor wafer 101 ', a spacer 104', and a transparent substrate 102 'are sequentially stacked.
- the semiconductor wafer 101 ′ is a substrate that becomes the base substrate 101 of the semiconductor device 100 as described above by going through an individualization process as described later.
- a plurality of individual circuits are provided on the functional surface of the semiconductor wafer 101 '.
- the light receiving portion 103 as described above is formed for each of the individual circuits.
- the spacer 104 ' has a lattice shape and is formed so as to surround each individual circuit (light receiving portion 103) on the semiconductor wafer 101'.
- the spacer 104 ′ forms a plurality of gaps 105 between the semiconductor wafer 101 ′ and the transparent substrate 102 ′. In other words, the region surrounded by the spacer 104 ′ becomes the gap portion 105.
- the spacer 104 ′ is a member that becomes the spacer 104 of the semiconductor device 100 as described above by undergoing an individualization process as described later.
- the transparent substrate 102 ' is bonded to the semiconductor wafer 101' via a spacer 104 '.
- the transparent substrate 102 ′ is a member that becomes the transparent substrate 102 of the semiconductor device 100 as described above by performing an individualization process as described later.
- a plurality of semiconductor devices 100 can be obtained by dividing such a semiconductor wafer bonded body 1000 into individual pieces as will be described later.
- FIGS. 4 and 5 are process diagrams showing a preferred embodiment of the method for manufacturing a semiconductor device (semiconductor wafer bonded body) according to the present invention.
- the spacer forming film 1 includes a support base 11 and a spacer forming layer 12 provided on the support base 11.
- the support substrate 11 is a sheet-like substrate and has a function of supporting the spacer forming layer 12.
- the support substrate 11 is made of a light transmissive material. By being composed of a light-transmitting material as described above, the spacer forming layer 12 is exposed while the support base 11 is attached to the spacer forming layer 12 in the manufacture of a semiconductor device as will be described later. Can do.
- the visible light transmittance of the support substrate 11 is preferably 30 to 100%, and more preferably 50 to 100%. Thereby, the spacer formation layer 12 can be exposed more reliably in the exposure process described later. In addition, alignment of an alignment mark on the mask 20 described later and an alignment mark on the semiconductor wafer 101 '(transparent substrate 102') can be reliably performed.
- the transmittance of the exposure light (i-line (365 nm)) of the support substrate 11 in the exposure step described later is preferably 50 to 100%, and more preferably 65 to 100%. Thereby, the spacer formation layer 12 can be exposed more reliably.
- Examples of the material constituting the support base 11 include polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE). Among these, it is preferable to use polyethylene terephthalate (PET) from the viewpoint of excellent balance between light transmittance and breaking strength.
- PET polyethylene terephthalate
- PP polypropylene
- PE polyethylene
- the spacer forming layer 12 is a layer that has adhesiveness to the surface of the semiconductor wafer and is bonded to the semiconductor wafer.
- the resin composition constituting the spacer forming layer 12 will be described in detail later.
- the visible light transmittance of the spacer forming layer 12 is preferably 30 to 100%, and more preferably 50 to 100%. Thereby, it can expose more reliably over the thickness direction of the spacer formation layer 12 in the exposure process mentioned later. In addition, alignment of an alignment mark on the mask 20 described later and an alignment mark on the semiconductor wafer 101 '(transparent substrate 102') can be reliably performed.
- the visible light transmittance of the support substrate 11 and the spacer forming layer 12 can be measured by the following method.
- the support substrate is measured with the thickness of the support substrate used, the spacer forming layer is 50 ⁇ m, and the measurement wavelength is 600 nm.
- a semiconductor wafer 101 ′ having a plurality of light receiving portions 103 and a microlens array (not shown) formed on the functional surface is prepared (see FIG. 4B).
- the functional surface of the semiconductor wafer 101 'and the spacer forming layer 12 (adhesion surface) of the spacer forming film 1 are bonded together (laminating step). Thereby, the semiconductor wafer 101 ′ to which the spacer forming film 1 is attached is obtained.
- the spacer forming layer 12 is exposed to light (ultraviolet rays) and exposed (exposure process).
- a mask 20 having a light transmitting portion 201 at a position corresponding to a portion to be the spacer 104 is used.
- the light transmission part 201 is a part having light transparency, and the light transmitted through the light transmission part 201 is irradiated to the spacer forming layer 12.
- the portion of the spacer forming layer 12 irradiated with light is selectively exposed. Thereby, the part irradiated with light among the spacer formation layers 12 is photocured.
- the spacer forming layer 12 is exposed with the support base material 11 attached to the spacer forming layer 12, and exposure light transmitted through the support base material 11 is used.
- the support base since the exposure is performed with the support base attached to the spacer formation layer, the support base exhibits a function as a protective layer of the spacer formation layer.
- the mask when the mask is set, the mask can be prevented from sticking to the spacer formation layer, and the distance between the mask and the spacer formation layer can be made smaller.
- the spacer can be formed with sufficient dimensional accuracy, and the gap 105 surrounded by the spacer 104 ′ can be formed in a shape close to the design. Thereby, a highly reliable semiconductor device can be obtained.
- the distance between the support substrate 11 and the mask 20 is preferably a separation distance of 0 to 2000 ⁇ m, more preferably 0 to 1000 ⁇ m, where the support substrate 11 and the mask 20 are in contact. Thereby, the image of the exposure light formed by the mask 20 can be made clearer, and the spacer 104 can be formed with sufficient dimensional accuracy.
- the support substrate 11 and the mask 20 it is preferable to expose the support substrate 11 and the mask 20 in contact with each other.
- the distance between the spacer forming layer 12 and the mask 20 becomes the thickness of the support base 11, and therefore the distance between the spacer forming layer 12 and the mask 20 can be kept constant.
- the portion of the spacer forming layer 12 to be exposed can be uniformly exposed, and the spacer 104 ′ having excellent dimensional accuracy can be formed more efficiently.
- the distance of the spacer formation layer 12 and the mask 20 is freely and correctly selected by selecting the thickness of the support base material 11 suitably. Furthermore, the distance between the spacer forming layer 12 and the mask 20 can be further reduced.
- the average thickness of the support base 11 is preferably 15 to 50 ⁇ m, and more preferably 25 to 50 ⁇ m, for example.
- the average thickness of the support substrate 11 is less than the lower limit value, it may be difficult to obtain the necessary strength as the support substrate. If the average thickness of the support base 11 exceeds the upper limit, depending on the light transmittance of the support base 11, the light irradiation energy may be used to reliably irradiate the spacer forming layer 12 with exposure light. May need to be increased.
- an alignment mark 1011 is provided on the semiconductor wafer 101 'in the vicinity of the edge thereof as shown in FIG.
- the mask 20 is provided with alignment marks 202 for alignment as shown in FIG.
- the alignment of the alignment mark 1011 of the semiconductor wafer 101 ′ and the alignment mark 202 of the mask 20 are aligned to align the mask 20 with respect to the semiconductor wafer 101 ′. Accordingly, the spacer 104 ′ can be formed with high positional accuracy, and the reliability of the formed semiconductor device 100 can be further increased.
- the spacer forming layer 12 may be subjected to a heat treatment at a temperature of about 40 to 80 ° C. (post-exposure heating step (PEB step)).
- PEB step post-exposure heating step
- the temperature of the heat treatment may be in the above range, but is more preferably 50 to 70 ° C. In the development step described later, unintentional peeling of the photocured portion can be more effectively prevented.
- the support base material 11 is removed (support base material removal process).
- the spacer forming layer 12 is developed using an alkaline aqueous solution to remove an uncured portion of the spacer forming layer 12, and the photocured portion has a lattice shape.
- the spacer 104 'remains (development process). In other words, portions 105 ′ that form a plurality of gaps between the semiconductor wafer and the transparent substrate are formed.
- a semiconductor wafer bonded body 1000 semiconductor wafer bonded body of the present invention in which the semiconductor wafer 101 ′, the spacer 104 ′, and the transparent substrate 102 ′ are sequentially stacked is obtained.
- the bonding between the spacer 104 ′ and the transparent substrate 102 ′ can be performed, for example, by bonding the upper surface of the formed spacer 104 ′ and the transparent substrate 102 ′ and then thermocompression bonding.
- thermocompression bonding is preferably performed within a temperature range of 80 to 180 ° C. Thereby, the shape of the spacer 104 to be formed can be improved.
- the lower surface (back surface) 111 opposite to where the transparent substrate 102 of the semiconductor wafer 101 'is bonded is ground (back grinding process).
- the lower surface 111 is ground by, for example, a grinder provided in a grinding device (grinder).
- the thickness of the semiconductor wafer 101 ′ varies depending on the electronic device to which the semiconductor device 100 is applied, but is usually set to about 100 to 600 ⁇ m and is applied to a smaller electronic device. Is set to about 50 ⁇ m.
- Examples of such processing include formation of wiring on the lower surface 111 and connection of solder bumps 106 as shown in FIG.
- a plurality of semiconductor devices 100 are obtained by separating the semiconductor wafer assembly 1000 into pieces so as to correspond to the individual circuits formed on the semiconductor wafer 101 ′, that is, the gaps 105 included in the spacer 104. (Dicing (dividing) process). In other words, a plurality of semiconductor devices 100 are obtained by cutting and separating the semiconductor wafer bonded body 1000 at positions corresponding to the spacers 104 ′.
- the semiconductor wafer bonded body 1000 is first cut from the semiconductor wafer 101 ′ side by a dicing saw so as to correspond to the position where the spacer 104 is formed. Then, the transparent substrate 102 ′ is also cut by making a cut corresponding to the cut 21 from the dicing saw. Through the steps as described above, the semiconductor device 100 can be manufactured.
- the semiconductor devices 100 can be mass-produced and productivity can be improved. Can do.
- the semiconductor device 100 is mounted on a support substrate having a patterned wiring, for example, via a solder bump 106, whereby the wiring provided in the support substrate and the wiring formed on the lower surface of the base substrate 101 are provided. Are electrically connected through the solder bumps 106.
- the semiconductor device 100 can be widely applied to electronic devices such as a mobile phone, a digital camera, a video camera, and a small camera while being mounted on the support substrate.
- the spacer forming layer 12 is formed on the semiconductor wafer 101 ′ and then exposed and developed, and then the spacer 104 ′ and the transparent substrate 102 ′ are bonded.
- the present invention is not limited to this.
- the spacer forming layer 12 may be formed on the transparent substrate 102 ′, exposed and developed, and then the spacer 104 ′ and the semiconductor wafer 101 ′ may be bonded.
- an alignment mark is provided on the transparent substrate 102 ′, and the alignment mark provided on the transparent substrate 102 ′ when the mask 20 is placed so as to face the support base 11 in the exposure step. It is preferable to align the mask 20 by aligning the alignment mark 202 provided on the mask 20. Accordingly, the spacer 104 ′ can be formed with high positional accuracy, and the reliability of the formed semiconductor device 100 can be further increased.
- the spacer forming layer 12 is a layer having photocurability, alkali developability and thermosetting, and is composed of a material (resin composition) containing an alkali-soluble resin, a thermosetting resin, and a photopolymerization initiator. Has been.
- the resin composition constituting the spacer forming layer 12 contains an alkali-soluble resin. Thereby, the spacer formation layer 12 has alkali developability.
- alkali-soluble resin examples include novolak resins such as cresol type, phenol type, bisphenol A type, bisphenol F type, catechol type, resorcinol type, pyrogallol type, phenol aralkyl resin, hydroxystyrene resin, methacrylic acid resin, and methacrylic acid ester resin.
- novolak resins such as cresol type, phenol type, bisphenol A type, bisphenol F type, catechol type, resorcinol type, pyrogallol type, phenol aralkyl resin, hydroxystyrene resin, methacrylic acid resin, and methacrylic acid ester resin.
- Acrylic resins such as, cyclic olefin resins containing hydroxyl groups and carboxyl groups, polyamide resins (specifically, having at least one of a polybenzoxazole structure and a polyimide structure, and having hydroxyl groups in the main chain or side chains, Resin having a carboxyl group, an ether group or an ester group, a resin having a polybenzoxazole precursor structure, a resin having a polyimide precursor structure, a resin having a polyamic acid ester structure, and the like. It can be used singly or in combination of two or more.
- alkali-soluble resins those having both an alkali-soluble group contributing to alkali development and a double bond are preferably used.
- alkali-soluble group examples include a hydroxyl group and a carboxyl group.
- the alkali-soluble group can contribute to alkali development and can also contribute to a thermosetting reaction.
- alkali-soluble resin can contribute to photocuring reaction by having a double bond.
- Examples of such a resin having an alkali-soluble group and a double bond include a curable resin that can be cured by both light and heat, and specifically, for example, an acryloyl group, a methacryloyl group, and a vinyl. And a thermosetting resin having a photoreactive group such as a group, and a photocurable resin having a thermoreactive group such as a phenolic hydroxyl group, an alcoholic hydroxyl group, a carboxyl group, and an acid anhydride group.
- the photocurable resin having a thermally reactive group may further have another thermally reactive group such as an epoxy group, an amino group, or a cyanate group.
- the photocurable resin having such a structure include (meth) acryl-modified phenolic resins, (meth) acryloyl group-containing acrylic acid polymers, carboxyl group-containing (epoxy) acrylates, and the like.
- a thermoplastic resin such as a carboxyl group-containing acrylic resin may be used.
- the resins having an alkali-soluble group and a double bond as described above it is preferable to use a (meth) acryl-modified phenol resin.
- a (meth) acrylic modified phenolic resin it contains an alkali-soluble group. Therefore, when an unreacted resin is removed by a development process, instead of an organic solvent that is usually used as a developer, the load on the environment is reduced. Less alkaline solution can be applied.
- the double bond contributes to the curing reaction, and as a result, the heat resistance of the resin composition can be improved.
- the (meth) acryl-modified phenol resin is preferably used from the viewpoint that the warpage of the semiconductor wafer bonded body 1000 can be reliably reduced by using the (meth) acryl-modified phenol resin.
- the (meth) acryl-modified phenol resin for example, a (meth) acryloyl-modified bisphenol resin obtained by reacting a hydroxyl group of a bisphenol with an epoxy group of a compound having an epoxy group and a (meth) acryloyl group is used. Can be mentioned.
- examples of such a (meth) acryloyl-modified bisphenol resin include those shown in Chemical Formula 1 below.
- the hydroxyl group in the molecular chain of the (meth) acryloyl-modified epoxy resin and dibasic A compound in which a dibasic acid is introduced by bonding to one carboxyl group in the acid by an ester bond (in addition, one or more repeating units of the epoxy resin in this compound are introduced in the molecular chain)
- the number of dibasic acids is 1 or more).
- such a compound for example, first, by reacting an epoxy group at both ends of an epoxy resin obtained by polymerizing epichlorohydrin and a polyhydric alcohol and (meth) acrylic acid, at both ends of the epoxy resin.
- an epoxy resin obtained by polymerizing epichlorohydrin and a polyhydric alcohol and (meth) acrylic acid at both ends of the epoxy resin.
- a (meth) acryloyl-modified epoxy resin having a (meth) acryloyl group introduced By obtaining a (meth) acryloyl-modified epoxy resin having a (meth) acryloyl group introduced, and then reacting the hydroxyl group in the molecular chain of the obtained (meth) acryloyl-modified epoxy resin with an anhydride of a dibasic acid It is obtained by forming an ester bond with one carboxyl group of this dibasic acid.
- the modification rate (substitution rate) of the photoreactive group is not particularly limited, but 20% of the total reactive groups of the resin having an alkali-soluble group and a double bond. It is preferably about 80%, more preferably about 30-70%. By setting the modification amount of the photoreactive group within the above range, a resin composition having particularly excellent resolution can be provided.
- the modification rate (substitution rate) of the thermally reactive group is not particularly limited, but is 20 to 20% of the total reactive group of the resin having an alkali-soluble group and a double bond. It is preferably about 80%, more preferably about 30 to 70%.
- the weight average molecular weight of the resin is not particularly limited, but is preferably 30000 or less, more preferably about 5000 to 150,000. preferable. When the weight average molecular weight is within the above range, the film formability is particularly excellent when the spacer forming layer is formed on the film.
- the weight average molecular weight of the alkali-soluble resin is, for example, G.P. P. C.
- the weight average molecular weight can be calculated from a calibration curve prepared in advance using a styrene standard substance.
- tetrahydrofuran (THF) was used as a measurement solvent, and measurement was performed under a temperature condition of 40 ° C.
- the content of the alkali-soluble resin in the resin composition is not particularly limited, but is preferably about 15 to 50% by weight, more preferably about 20 to 40% by weight in the entire resin composition. .
- the content of the alkali-soluble resin is about 10 to 80% by weight of the resin components (all components except the filler) of the resin composition. Preferably, it may be about 15 to 70% by weight. If the content of the alkali-soluble resin is less than the lower limit, the effect of improving the compatibility with other components in the resin composition (for example, a photocurable resin and a thermosetting resin described later) may be reduced.
- the resin composition which comprises the spacer formation layer 12 contains the thermosetting resin.
- the spacer forming layer 12 exhibits adhesiveness by curing. That is, after the spacer forming layer 12 and the semiconductor wafer are bonded, exposed and developed, the transparent substrate 102 can be thermocompression bonded to the spacer forming layer 12.
- thermosetting resin when a curable resin that can be cured by heat is used as the aforementioned alkali-soluble resin, a resin different from this resin is selected.
- thermosetting resin for example, phenol novolak resin, cresol novolak resin, novolak type phenol resin such as bisphenol A novolak resin, phenol resin such as resol phenol resin, bisphenol A epoxy resin, bisphenol F epoxy resin Bisphenol type epoxy resin, novolac epoxy resin, cresol novolak epoxy resin, etc., biphenyl type epoxy resin, stilbene type epoxy resin, triphenolmethane type epoxy resin, alkyl-modified triphenolmethane type epoxy resin, triazine core Containing epoxy resin, epoxy resin such as dicyclopentadiene modified phenolic epoxy resin, triazine ring such as urea (urea) resin, melamine resin Fats, unsaturated polyester resins, bismaleimide resins, polyurethane resins, diallyl phthalate resins, silicone resins, resins having a benzoxazine ring, cyanate ester resins, epoxy-modified siloxanes, and the like. They can be used in
- an epoxy resin as an epoxy resin, use an epoxy resin that is solid at room temperature (especially a bisphenol type epoxy resin) and an epoxy resin that is liquid at room temperature (especially a silicone-modified epoxy resin that is liquid at room temperature). Is preferred. Thereby, it can be set as the spacer formation layer 12 which is excellent in both flexibility and resolution while maintaining heat resistance.
- the content of the thermosetting resin in the resin composition is not particularly limited, but is preferably about 10 to 40% by weight, and more preferably about 15 to 35% by weight in the entire resin composition. There exists a possibility that the effect of improving the heat resistance of the spacer formation layer 12 obtained as content of a thermosetting resin is less than the said lower limit may fall. Moreover, when content of a thermosetting resin exceeds the said upper limit, there exists a possibility that the effect which improves the toughness of the spacer formation layer 12 may fall.
- thermosetting resin when used as the thermosetting resin, it is preferable to further include a phenol novolac resin in addition to the epoxy resin.
- a phenol novolac resin By adding a phenol novolac resin, the developability of the resulting spacer forming layer 12 can be improved.
- thermosetting resin by including both an epoxy resin and a phenol novolac resin as the thermosetting resin in the resin composition, the thermosetting property of the epoxy resin is further improved, and the strength of the spacer 104 to be formed is further improved. The advantage of being able to
- the resin composition constituting the spacer forming layer 12 contains a photopolymerization initiator. Thereby, the spacer formation layer 12 can be efficiently patterned by photopolymerization.
- photopolymerization initiator examples include benzophenone, acetophenone, benzoin, benzoin isobutyl ether, methyl benzoin benzoate, benzoin benzoic acid, benzoin methyl ether, benzylfinyl sulfide, benzyl, dibenzyl, diacetyl, benzyldimethyl ketal, and the like. .
- the content of the photopolymerization initiator in the resin composition is not particularly limited, but is preferably about 0.5 to 5% by weight, and preferably about 0.8 to 3.0% by weight in the entire resin composition. More preferably. If the content of the photopolymerization initiator is less than the lower limit, the effect of starting photopolymerization may not be sufficiently obtained. Moreover, when content of a photoinitiator exceeds the said upper limit, reactivity will become high and there exists a possibility that a preservability and resolution may fall.
- the resin composition constituting the spacer forming layer 12 preferably contains a photopolymerizable resin in addition to the above components. Thereby, it will be contained in a resin composition with the alkali-soluble resin mentioned above, and the patterning property of the spacer formation layer 12 obtained can be improved more.
- this photopolymerizable resin when a curable resin curable with light is used as the alkali-soluble resin described above, a resin different from this resin is selected.
- the photopolymerizable resin is not particularly limited.
- an unsaturated polyester an acrylic compound such as an acrylic monomer or oligomer having at least one acryloyl group or methacryloyl group in one molecule, or a vinyl type such as styrene.
- acrylic compound such as an acrylic monomer or oligomer having at least one acryloyl group or methacryloyl group in one molecule
- vinyl type such as styrene.
- examples thereof include compounds, and these can be used alone or in combination of two or more.
- an ultraviolet curable resin mainly composed of an acrylic compound is preferable.
- Acrylic compounds are preferably used because they have a high curing rate when irradiated with light and can pattern a resin with a relatively small amount of exposure.
- acrylic compound examples include monomers of acrylic acid ester or methacrylic acid ester, and specifically include ethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, glycerin di (meth) acrylate.
- the spacer 104 obtained from the spacer formation layer 12 can exhibit excellent strength.
- the semiconductor device 100 including the spacer 104 is more excellent in shape retention.
- the acrylic polyfunctional monomer means a monomer of (meth) acrylic acid ester having a tri- or higher functional acryloyl group or methacryloyl group.
- acrylic polyfunctional monomers it is particularly preferable to use trifunctional (meth) acrylate or tetrafunctional (meth) acrylate. Thereby, the said effect can be exhibited more notably.
- an acrylic polyfunctional monomer as the photopolymerizable resin
- an acrylic polyfunctional monomer and epoxy vinyl ester resin carry out radical polymerization, the intensity
- the solubility with respect to the alkali developing solution of the part which is not exposed of the spacer formation layer 12 can be improved at the time of image development, the residue after image development can be reduced.
- Epoxy vinyl ester resins include 2-hydroxy-3-phenoxypropyl acrylate, Epolite 40E methacrylic adduct, Epolite 70P acrylic acid adduct, Epolite 200P acrylic acid adduct, Epolite 80MF acrylic acid adduct, Epolite 3002 methacrylic acid adduct.
- the content of the acrylic polyfunctional polymer in the resin composition is not particularly limited, but is about 1 to 50% by weight in the entire resin composition. It is preferably about 5% to 25% by weight.
- the photopolymerizable resin contains an epoxy vinyl ester resin in addition to the acrylic polyfunctional polymer
- the content of the epoxy vinyl ester resin is not particularly limited, but is 3 to 30% by weight in the entire resin composition. It is preferably about 5% to 15% by weight.
- the photopolymerizable resin as described above is preferably liquid at normal temperature.
- the curing reactivity by light irradiation for example, ultraviolet irradiation
- another compounding component for example, alkali-soluble resin
- the photopolymerizable resin that is liquid at normal temperature include, for example, an ultraviolet curable resin mainly composed of the acrylic compound described above.
- the weight average molecular weight of the photopolymerizable resin is not particularly limited, but is preferably 5,000 or less, and more preferably about 150 to 3,000. When the weight average molecular weight is within the above range, the sensitivity of the spacer forming layer 12 is particularly excellent. Furthermore, the resolution of the spacer formation layer 12 is also excellent.
- the weight average molecular weight of the photopolymerizable resin is, for example, G.P. P. C. And can be calculated using the same method as described above.
- the resin composition used for forming the spacer forming layer 12 may contain an inorganic filler. Thereby, the strength of the spacer 104 formed by the spacer forming layer 12 can be further improved.
- the content of the inorganic filler in the resin composition is preferably 9% by weight or less in the entire resin composition.
- the strength of the spacer 104 formed by the spacer forming layer 12 can be sufficiently improved by the addition of the acrylic polyfunctional monomer.
- the addition of an inorganic filler into the resin composition can be omitted.
- inorganic fillers include fibrous fillers such as alumina fibers and glass fibers, potassium titanate, wollastonite, aluminum borate, acicular magnesium hydroxide, acicular fillers such as whiskers, talc, and mica. , Sericite, glass flakes, flake graphite, platy fillers such as platy calcium carbonate, spherical fillers such as calcium carbonate, silica, fused silica, calcined clay, unfired clay, zeolite, silica gel And the like, and the like. These may be used alone or in combination. Among these, it is particularly preferable to use a porous filler.
- the average particle size of the inorganic filler is not particularly limited, but is preferably about 0.01 to 90 ⁇ m, and more preferably about 0.1 to 40 ⁇ m.
- the average particle diameter exceeds the upper limit, there is a risk that the appearance of the spacer forming layer 12 may be abnormal or the resolution may be poor. Further, if the average particle diameter is less than the lower limit value, there is a risk of poor adhesion when the spacer 104 is heated and pasted to the transparent substrate 102.
- the average particle size can be evaluated using, for example, a laser diffraction particle size distribution analyzer SALD-7000 (manufactured by Shimadzu Corporation).
- the average pore diameter of the porous filler is preferably about 0.1 to 5 nm, and more preferably about 0.3 to 1 nm.
- the resin composition constituting the spacer forming layer 12 can contain additives such as a plastic resin, a leveling agent, an antifoaming agent, and a coupling agent within the range not impairing the object of the present invention in addition to the above-described components. .
- the visible light transmittance of the spacer forming layer 12 can be made more suitable, and exposure defects in the exposure process can be more effectively prevented. can do. As a result, a more reliable semiconductor device can be provided.
- one or two or more steps for an arbitrary purpose may be added.
- PLB process post-lamination heating process
- the exposure is performed once has been described.
- the present invention is not limited to this.
- the exposure may be performed a plurality of times.
- Example 1 Synthesis of alkali-soluble resin ((meth) acrylic modified bis A novolak resin) Into a 2 L flask, 1.5 g of tributylamine as a catalyst and 0.15 g of hydroquinone as a polymerization inhibitor were added and heated to 100 ° C. The glycidyl methacrylate 180.9g was dripped in 30 minutes in it, and the methacryloyl modified novolak-type bisphenol A resin MPN001 (methacryloyl modification rate 50%) of solid content 74% was obtained by making it stir-react at 100 degreeC for 5 hours. .
- alkali-soluble resin ((meth) acrylic modified bis A novolak resin) Into a 2 L flask, 1.5 g of tributylamine as a catalyst and 0.15 g of hydroquinone as a polymerization inhibitor were added and heated to 100 ° C. The glycidyl methacrylate 180.9g was dripped in 30 minutes in it, and
- resin varnish of resin composition constituting spacer forming layer As photopolymerizable resin, trimethylolpropane trimethacrylate (manufactured by Kyoeisha Chemical Co., Ltd., light ester TMP) 15% by weight, epoxy vinyl ester resin (Kyoeisha Chemical Co., Ltd.) ), Epoxy ester 3002M) 5% by weight, epoxy resin which is a thermosetting resin, 5% by weight of bisphenol A novolac type epoxy resin (Dainippon Ink Chemical Co., Ltd., Epicron N-865), bisphenol A type 10% by weight of epoxy resin (Japan Epoxy Resin Co., Ltd., YL6810), 5% by weight of silicone epoxy resin (Toray Dow Corning Silicone Co., Ltd., BY16-115), phenol novolac resin (Sumitomo Bakelite Co., Ltd.) PR53647) 3% by weight, alkali acceptable As a soluble resin, 55 wt% of the above MPN
- the resin varnish prepared as described above is applied onto the supporting substrate with a comma coater (manufactured by Yurai Seiki Co., Ltd., “Model No. MFG No. 194001 type 3-293”) to form a coating film composed of the resin varnish. Formed. Then, the film for spacer formation was obtained by drying the formed coating film at 80 degreeC for 20 minutes, and forming a spacer formation layer. In the obtained spacer forming film, the average thickness of the spacer forming layer was 50 ⁇ m. Further, the visible light (600 nm) transmittance of the formed spacer formation layer was 99%.
- a semiconductor wafer Si wafer, diameter 20.3 cm, thickness 725 ⁇ m
- the semiconductor wafer prepared what provided the alignment mark in two places which are point-symmetric with respect to the center of the semiconductor wafer at a position of 5 mm from the edge of the semiconductor wafer.
- the spacer forming film manufactured above was laminated on the semiconductor wafer under the conditions of a roll temperature of 60 ° C., a roll speed of 0.3 m / min, and a syringe pressure of 2.0 kgf / cm 2.
- a semiconductor wafer with a spacer forming film was obtained.
- a mask having two alignment marks for alignment with the semiconductor wafer and having a light transmission portion having the same shape as that of the spacer to be formed in plan view is prepared.
- a mask was placed so as to face the spacer forming film so that the alignment marks on the wafer were aligned.
- the distance between the mask and the supporting substrate was set to 0 mm.
- the spacer forming layer is exposed in a lattice pattern by irradiating the semiconductor wafer with the spacer forming film through the mask with ultraviolet rays (wavelength 365 nm, integrated light quantity 700 mJ / cm 2 ) from the spacer forming film side. After that, the supporting substrate was removed. In the exposure of the spacer formation layer, 50% of the spacer formation layer was exposed in a plan view so that the width of the exposed portion exposed in a lattice shape was 0.6 mm.
- TMAH tetramethylammonium hydroxide
- a transparent substrate (quartz glass substrate, diameter: 20.3 cm, thickness: 725 ⁇ m) was prepared, and this was applied to a semiconductor wafer on which a spacer was formed. ) was used to produce a bonded semiconductor wafer in which the semiconductor wafer and the transparent substrate were bonded via a spacer.
- Example 2 A semiconductor wafer bonded body was manufactured in the same manner as in Example 1 except that the blending ratio of each component of the resin composition constituting the spacer forming layer was changed as shown in Table 1.
- Examples 4 to 10 A semiconductor wafer bonded body was manufactured in the same manner as in Example 1 except that the average thickness of the supporting substrate and the distance between the mask and the supporting substrate were changed as shown in Table 1.
- Table 1 shows the types and amounts of components of the resin composition of the spacer forming layer in each example and comparative example.
- methacryloyl-modified novolak bisphenol A resin is "MPN”
- trimethylolpropane trimethacrylate is "TMP”
- epoxy vinyl ester resin is "3002M”
- bisphenol A novolac epoxy resin is "N865"
- bisphenol A type The epoxy resin was indicated as “YL”, the silicone epoxy resin as “BY16”, and the phenol novolac resin as “PR”.
- Evaluation of patterning property by exposure [2-1] Evaluation 1 The actual dimensions of the spacers of the semiconductor wafer assemblies of each Example and Comparative Example were measured with a stereomicroscope ( ⁇ 500 times), the values were compared with the target dimensions, and the patterning property by exposure was in accordance with the following evaluation criteria. evaluated. A: The dimensional accuracy was 99% or more. A: The dimensional accuracy was 96% or more and less than 99%. ⁇ : The dimensional accuracy was 93% or more and less than 96%. X: The dimensional accuracy was smaller than 93%.
- the bonded semiconductor wafer according to the present invention had no spacers and the like and had excellent dimensional accuracy.
- the semiconductor device manufactured using the semiconductor wafer bonded body according to the present invention has a particularly high reliability.
- the accuracy of the patterning property by exposure was not sufficient.
- the present invention it is possible to provide a semiconductor device excellent in reliability, a semiconductor wafer bonded body capable of easily manufacturing such a semiconductor device, and a manufacturing method thereof. Therefore, it has industrial applicability.
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Abstract
Description
(1) 半導体ウエハーと、該半導体ウエハーの機能面側に設置された透明基板と、前記半導体ウエハーと前記透明基板との間に設けられたスペーサとを有する半導体ウエハー接合体を製造する方法であって、
シート状の支持基材と、該支持基材上に設けられた接着性を有するスペーサ形成層とを有するスペーサ形成用フィルムを用意するスペーサ形成用フィルム用意工程と、
前記スペーサ形成用フィルムの前記スペーサ形成層を前記半導体ウエハーの機能面に貼着する貼着工程と、
前記スペーサ形成用フィルムの前記支持基材側にマスクを設置し、該マスクを用いて、露光光が前記支持基材を透過するようにして前記スペーサ形成層の前記スペーサとなるべき部位を選択的に露光する露光工程と、
前記露光後に、前記支持基材を除去する支持基材除去工程と、
露光した前記スペーサ形成層を現像し、前記半導体ウエハー上に前記スペーサを形成する現像工程と、
前記スペーサの前記半導体ウエハー側とは反対側の面に前記透明基板を接合する接合工程とを有することを特徴とする半導体ウエハー接合体の製造方法。
シート状の支持基材と、該支持基材上に設けられた接着性を有するスペーサ形成層とを有するスペーサ形成用フィルムを用意するスペーサ形成用フィルム用意工程と、
前記スペーサ形成用フィルムの前記スペーサ形成層を前記透明基板に貼着する貼着工程と、
前記スペーサ形成用フィルムの前記支持基材側にマスクを設置し、該マスクを用いて、露光光が前記支持基材を透過するようにして前記スペーサ形成層の前記スペーサとなるべき部位を選択的に露光する露光工程と、
前記露光後に、前記支持基材を除去する支持基材除去工程と、
露光した前記スペーサ形成層を現像し、前記透明基板上に前記スペーサを形成する現像工程と、
前記スペーサの前記透明基板側とは反対側の面に前記半導体ウエハーの機能面を接合する接合工程とを有することを特徴とする半導体ウエハー接合体の製造方法。
<半導体装置(イメージセンサ)>
まず、本発明の半導体ウエハー接合体の製造方法を説明するのに先立って、本発明の半導体ウエハー接合体より製造された半導体装置について説明する。
次に、半導体ウエハー接合体について説明する。
図2は、本発明の半導体ウエハー接合体の一例を示す縦断面図、図3は、本発明の半導体ウエハー接合体の一例を示す平面図である。
次に、本発明の半導体装置(半導体ウエハー接合体)の製造方法の好適な実施形態について説明する。
スペーサ形成用フィルム1は、図4(a)に示すように、支持基材11と、支持基材11上に設けられたスペーサ形成層12とを有している。
この際、図4(d)に示すように、スペーサ104となるべき部分に対応する位置に光透過部201を備えるマスク20を用いる。光透過部201は、光透過性を有する部位で、該光透過部201を透過した光はスペーサ形成層12に照射される。そして、スペーサ形成層12の光が照射された部分が選択的に露光される。これにより、スペーサ形成層12のうち、光が照射された部分が光硬化する。
次に、図4(f)に示すように、スペーサ形成層12をアルカリ水溶液を用いて現像することにより、スペーサ形成層12のうち、未硬化の部分が除去され、光硬化した部位が格子状のスペーサ104’として残存する(現像工程)。言い換えると、半導体ウエハーと透明基板との間の複数の空隙部となる部位105’が形成される。
以上のような工程を経ることにより、半導体装置100を製造することができる。
次に、スペーサ形成層12を構成する樹脂組成物の好適な実施形態について説明する。
スペーサ形成層12は、光硬化性、アルカリ現像性および熱硬化性を備えた層であり、アルカリ可溶性樹脂と、熱硬化性樹脂と、光重合開始剤とを含む材料(樹脂組成物)で構成されている。
(アルカリ可溶性樹脂)
スペーサ形成層12を構成する樹脂組成物は、アルカリ可溶性樹脂を含んでいる。これにより、スペーサ形成層12は、アルカリ現像性を有するものとなる。
また、スペーサ形成層12を構成する樹脂組成物は、熱硬化性樹脂を含んでいる。これにより、スペーサ形成層12は、露光、現像した後でも、その硬化により接着性を発揮するものとなる。すなわち、スペーサ形成層12と半導体ウエハーとを接合して、露光、現像した後、透明基板102をスペーサ形成層12に熱圧着することができる。
スペーサ形成層12を構成する樹脂組成物は、光重合開始剤を含んでいる。これにより、光重合によりスペーサ形成層12を効率良くパターニングすることができる。
スペーサ形成層12を構成する樹脂組成物は、上記成分の他、光重合性樹脂を含んでいるのが好ましい。これにより、前述したアルカリ可溶性樹脂と共に樹脂組成物中に含まれることとなり、得られるスペーサ形成層12のパターニング性をより向上させることができる。
なお、スペーサ形成層12を形成するために用いられる樹脂組成物中は、無機充填材を含有していてもよい。これにより、スペーサ形成層12により形成されるスペーサ104の強度をより向上させることができる。
各実施例および比較例の半導体ウエハー接合体を、それぞれ、以下のようにして100個ずつ製造した。
1.アルカリ可溶性樹脂((メタ)アクリル変性ビスAノボラック樹脂)の合成
ノボラック型ビスフェノールA樹脂(フェノライトLF-4871、大日本インキ化学(株)製)の固形分60%MEK(メチルエチルケトン)溶液500gを、2Lフラスコ中に投入し、これに触媒としてトリブチルアミン1.5g、および重合禁止剤としてハイドロキノン0.15gを添加し、100℃に加温した。その中へ、グリシジルメタクリレート180.9gを30分間で滴下し、100℃で5時間攪拌反応させることにより、固形分74%のメタクリロイル変性ノボラック型ビスフェノールA樹脂MPN001(メタクリロイル変性率50%)を得た。
光重合性樹脂として、トリメチロールプロパントリメタクリレート(共栄社化学(株)製、ライトエステルTMP)15重量%、エポキシビニルエステル樹脂(共栄社化学(株)製、エポキシエステル3002M)5重量%、熱硬化性樹脂であるエポキシ樹脂として、ビスフェノールAノボラック型エポキシ樹脂(大日本インキ化学工業(株)製、エピクロンN-865)5重量%、ビスフェノールA型エポキシ樹脂(ジャパンエポキシレジン(株)製、YL6810)10重量%、シリコーンエポキシ樹脂(東レ・ダウコーニング・シリコーン(株)製、BY16-115)5重量%、フェノールノボラック樹脂(住友ベークライト(株)、PR53647)3重量%、アルカリ可溶性樹脂として上記MPN001を固形分として55重量%、光重合開始剤(チバ・スペシャリティ・ケミカルズ(株)製、イルガキュア651)2重量%を秤量し、ディスパーザーを用い、回転数3000rpmで1時間攪拌し、樹脂ワニスを調製した。
まず、支持基材として、ポリエステルフィルム(三菱樹脂社製、「MRX50」、厚さ50μm、可視光(600nm)の透過率:85%、露光光:i線(365nm)の透過率76%を用意した。
まず、ほぼ円形状をなす直径8インチの半導体ウエハー(Siウエハー、直径20.3cm、厚さ725μm)を用意した。なお、半導体ウエハーは、半導体ウエハーの縁部から5mmの位置で、半導体ウエハーの中心を軸に互いに点対称となる2箇所にアライメントマークを設けたものを用意した。
スペーサ形成層を構成する樹脂組成物の各成分の配合比を表1に示すように変更した以外は、前記実施例1と同様にして半導体ウエハー接合体を製造した。
支持基材の平均厚さ、マスクと支持基材との距離を表1に示すように変更した以外は、前記実施例1と同様にして半導体ウエハー接合体を製造した。
露光工程において、スペーサ形成用フィルムから支持基材を除去した状態で、スペーサ形成層からマスクまでの距離を3000μmとして、スペーサ形成層を露光した以外は、前記実施例1と同様にして半導体ウエハー接合体を製造した。
[2-1]評価1
各実施例および比較例の半導体ウエハー接合体のスペーサの実寸法を実体顕微鏡(×500倍)により測定し、その値と目標寸法とを比較して、露光によるパターンニング性を以下の評価基準に従い評価した。
◎:寸法精度が99%以上であった。
○:寸法精度が96%以上99%未満であった。
△:寸法精度が93%以上96%未満であった。
×:寸法精度が93%よりも小さかった。
各実施例および比較例の半導体ウエハー接合体100個のスペーサの形状を電子顕微鏡(×5,000倍)で観察し、露光によるパターンニング性を以下の評価基準に従い評価した。
◎:100個全てにおいてスペーサに欠け等が全くなく、高い精度でパターンニングされていた。
○:100個のうち1~10個の半導体ウエハー接合体のスペーサに欠け等が見られるが、実用上問題のないパターンニング性を示した。
△:100個のうち11~20個の半導体ウエハー接合体のスペーサに欠け等が見られ、十分なパターンニング性を示すものではなかった。
×:100個のうち21個以上の半導体ウエハー接合体のスペーサに欠け等が見られ、パターンニング性の精度が低かった。
各実施例および比較例の任意の1つの半導体ウエハー接合体のスペーサおよび空隙部を実体顕微鏡(×500倍)で観察し、残渣の有無を以下の評価基準に従い評価した。
◎:残渣が全く確認されず、実用上全く問題ない。
○:残渣が若干確認できるが、実用上問題ないレベルである。
△:残渣が比較的多く観察され、実用レベルではない。
×:残渣が多数確認され、実用レベルではない。
これらの結果を表2に示した。
各実施例および比較例で得られた半導体ウエハー接合体を、ダイシングソーを用い、スペーサに対応する位置でダイシングし、複数の受光装置を得た。
得られた受光装置を、-55℃で1時間、125℃で1時間処理するサイクルを繰り返す温度サイクル試験を100サイクル行い(n=10)、クラックおよび剥離の観察を実施し、以下の評価基準に従い評価した。
◎:全サンプルクラックおよび剥離がなく、実用上全く問題なし。
○:僅かなクラックおよび剥離が2個以下のサンプルで確認されるが、実用上問題なし。
△:3個以上のサンプルでクラックおよび剥離が観察され、実用レベルではない。
×:8個以上のサンプルでクラックおよび剥離が観察され、実用レベルではない。
この結果を、表2に合わせて示した。
これに対して、比較例では、露光によるパターンニング性の精度が十分ではなかった。
Claims (14)
- 半導体ウエハーと、該半導体ウエハーの機能面側に設置された透明基板と、前記半導体ウエハーと前記透明基板との間に設けられたスペーサとを有する半導体ウエハー接合体を製造する方法であって、
シート状の支持基材と、該支持基材上に設けられた接着性を有するスペーサ形成層とを有するスペーサ形成用フィルムを用意するスペーサ形成用フィルム用意工程と、
前記スペーサ形成用フィルムの前記スペーサ形成層を前記半導体ウエハーの機能面に貼着する貼着工程と、
前記スペーサ形成用フィルムの前記支持基材側にマスクを設置し、該マスクを用いて、露光光が前記支持基材を透過するようにして前記スペーサ形成層の前記スペーサとなるべき部位を選択的に露光する露光工程と、
前記露光後に、前記支持基材を除去する支持基材除去工程と、
露光した前記スペーサ形成層を現像し、前記半導体ウエハー上に前記スペーサを形成する現像工程と、
前記スペーサの前記半導体ウエハー側とは反対側の面に前記透明基板を接合する接合工程とを有することを特徴とする半導体ウエハー接合体の製造方法。 - 半導体ウエハーと、該半導体ウエハーの機能面側に設置された透明基板と、前記半導体ウエハーと前記透明基板との間に設けられたスペーサとを有する半導体ウエハー接合体を製造する方法であって、
シート状の支持基材と、該支持基材上に設けられた接着性を有するスペーサ形成層とを有するスペーサ形成用フィルムを用意するスペーサ形成用フィルム用意工程と、
前記スペーサ形成用フィルムの前記スペーサ形成層を前記透明基板に貼着する貼着工程と、
前記スペーサ形成用フィルムの前記支持基材側にマスクを設置し、該マスクを用いて、露光光が前記支持基材を透過するようにして前記スペーサ形成層の前記スペーサとなるべき部位を選択的に露光する露光工程と、
前記露光後に、前記支持基材を除去する支持基材除去工程と、
露光した前記スペーサ形成層を現像し、前記透明基板上に前記スペーサを形成する現像工程と、
前記スペーサの前記透明基板側とは反対側の面に前記半導体ウエハーの機能面を接合する接合工程とを有することを特徴とする半導体ウエハー接合体の製造方法。 - 前記露光工程において、前記マスクを前記支持基材と対向するように設置する際に、前記半導体ウエハーに設けられたアライメントマークと、前記マスクに設けられたアライメントマークとを合わせることにより、前記マスクの位置合わせを行う請求項1に記載の半導体ウエハー接合体の製造方法。
- 前記露光工程において、前記マスクを前記支持基材と対向するように設置する際に、前記透明基板に設けられたアライメントマークと、前記マスクに設けられたアライメントマークとを合わせることにより、前記マスクの位置合わせを行う請求項2に記載の半導体ウエハー接合体の製造方法。
- 前記支持基材の可視光の透過率は、30~100%である請求項1ないし4のいずれかに記載の半導体ウエハー接合体の製造方法。
- 前記スペーサ形成層の可視光の透過率は、30~100%である請求項1ないし5のいずれかに記載の半導体ウエハー接合体の製造方法。
- 前記露光工程における、前記支持基材の露光光の透過率は、50~100%である請求項1ないし6のいずれかに記載の半導体ウエハー接合体の製造方法。
- 前記支持基材の平均厚さは、15~50μmである請求項1ないし7のいずれかに記載の半導体ウエハー接合体の製造方法。
- 前記露光工程における前記マスクと前記支持基材との距離は、0~1000μmである請求項1ないし8のいずれかに記載の半導体ウエハー接合体の製造方法。
- 前記スペーサ形成層は、アルカリ可溶性樹脂と、熱硬化性樹脂と、光重合開始剤とを含む材料で構成されている請求項1ないし9のいずれかに記載の半導体ウエハー接合体の製造方法。
- 前記アルカリ可溶性樹脂は、(メタ)アクリル変性フェノール樹脂である請求項10に記載の半導体ウエハー接合体の製造方法。
- 前記熱硬化性樹脂は、エポキシ樹脂である請求項10または11に記載の半導体ウエハー接合体の製造方法。
- 請求項1ないし12のいずれかに記載の方法により製造されたことを特徴とする半導体ウエハー接合体。
- 請求項13に記載の半導体ウエハー接合体を、前記スペーサに対応する位置で切断し、個片化することにより得られることを特徴とする半導体装置。
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