WO2020230211A1 - ピックアップ性の評価方法、ダイシング・ダイボンディング一体型フィルム、ダイシング・ダイボンディング一体型フィルムの評価方法及び選別方法、並びに半導体装置の製造方法 - Google Patents
ピックアップ性の評価方法、ダイシング・ダイボンディング一体型フィルム、ダイシング・ダイボンディング一体型フィルムの評価方法及び選別方法、並びに半導体装置の製造方法 Download PDFInfo
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- WO2020230211A1 WO2020230211A1 PCT/JP2019/018820 JP2019018820W WO2020230211A1 WO 2020230211 A1 WO2020230211 A1 WO 2020230211A1 JP 2019018820 W JP2019018820 W JP 2019018820W WO 2020230211 A1 WO2020230211 A1 WO 2020230211A1
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- adhesive layer
- dicing
- chip
- adhesive
- die bonding
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Images
Classifications
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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
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- 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
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L24/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
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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
- H01L24/73—Means for bonding being of different types provided for in two or more of groups H01L24/10, H01L24/18, H01L24/26, H01L24/34, H01L24/42, H01L24/50, H01L24/63, H01L24/71
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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
- H01L24/80—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
- H01L24/83—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
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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
- H01L24/91—Methods for connecting semiconductor or solid state bodies including different methods provided for in two or more of groups H01L24/80 - H01L24/90
- H01L24/92—Specific sequence of method steps
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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
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
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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
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Definitions
- the present disclosure relates to a pick-up property evaluation method, a dicing / die bonding integrated film, a dicing / die bonding integrated film evaluation method and a sorting method, and a semiconductor device manufacturing method.
- the dicing step is carried out with the adhesive film for dicing attached to the wafer.
- an expanding step, a picking step, a mounting step, a die bonding step and the like are carried out.
- a film called a dicing / die bonding integrated film is used (see Patent Documents 1 and 2).
- This film has a structure in which a base material layer, an adhesive layer, and an adhesive layer are laminated in this order, and is used, for example, as follows.
- the surface on the adhesive layer side is attached to the wafer, and the wafer is diced with the wafer fixed by the dicing ring. As a result, the wafer is fragmented into a large number of chips.
- the chip is separated from the adhesive layer together with the adhesive piece obtained by separating the adhesive layer. Pick up.
- the semiconductor device is manufactured through a step of mounting the chip on a substrate or the like via an adhesive piece.
- a laminate of a chip and an adhesive piece is referred to as a "chip with an adhesive piece”.
- the adhesive layer (dicing film) whose adhesive strength is weakened by irradiation with ultraviolet rays is called a UV curable type.
- a pressure-sensitive adhesive layer in which the adhesive strength remains constant without being irradiated with ultraviolet rays is called a pressure-sensitive type.
- the dicing / die bonding integrated film having a pressure-sensitive adhesive layer does not require a process of irradiating ultraviolet rays for users (mainly semiconductor device manufacturers), and does not require equipment for this purpose. There are merits.
- Patent Document 3 can be said to be a UV curable type in that the pressure-sensitive adhesive layer contains a component that is cured by ultraviolet rays, while only a predetermined portion of the pressure-sensitive adhesive layer is irradiated with ultraviolet rays in advance, and the user can use the semiconductor device.
- a dicing die bond film which can be said to be a pressure sensitive type in that it does not need to be irradiated with ultraviolet rays in the manufacturing process.
- the adhesive layer of the dicing / die bond integrated film is required to have high adhesive strength to the adhesive layer and the dicing ring in the dicing process. If the adhesive strength of the adhesive layer is insufficient, peeling occurs between the adhesive layer and the adhesive layer as the dicing blade rotates at high speed, and the chip with the adhesive piece flies (hereinafter referred to as "DAF jump"). DAF is a die attach film), or a phenomenon in which the dicing ring is peeled off from the adhesive layer due to the flow of cutting water (hereinafter, this phenomenon is referred to as "ring peeling”) occurs.
- the adhesive force of the pressure-sensitive adhesive layer to the adhesive layer is required to be low to some extent from the viewpoint of excellent pick-up property. If the adhesive strength of the pressure-sensitive adhesive layer is excessively strong, the chip with the adhesive piece does not peel off from the pressure-sensitive adhesive layer, resulting in poor pickup or cracking of the chip, resulting in a decrease in yield.
- the present inventors exhibit a peculiar pickup behavior in the subsequent pickup step from the conventional knowledge. I found that. That is, if a chip having a relatively large size (for example, 8 mm in length ⁇ 6 mm in width) is the pickup target, the pickup target is small even if the adhesive strength of the adhesive layer is reduced to the extent that excellent pickup performance can be achieved. In the case of a chip, there was a phenomenon that the pick-up property was insufficient.
- edge peeling the peeling of the edge of the chip from the adhesive layer
- the peeling of the interface between the chip surface and the pressure-sensitive adhesive layer rather than the edge of the chip controls the pick-up property. It is presumed to be a factor. That is, when a large chip (for example, an area of more than 20 mm 2 in a plan view) is picked up by pushing up the center of the chip from below with a pin of a push-up jig, the edge of the chip is centered as the pin rises.
- the interfacial peeling between the adhesive layer and the adhesive piece progresses toward the portion, if the adhesive force of the adhesive layer against the adhesive piece is excessively large, the interfacial peeling cannot keep up with the rise of the pin and the chip cracks. Or, pick-up mistakes are likely to occur.
- the pick-up property of a large chip is mainly controlled by the interfacial peeling between the adhesive layer and the adhesive piece, and the adhesive strength of the adhesive layer should be set to a value as small as possible (for example, less than 1.2 N / 25 mm). The inventors have found.
- the pick-up property of the small chip is mainly dominated by the edge peeling strength of the chip with the adhesive piece, and once the edge peeling occurs by pushing up with the pin, the interface peeling between the adhesive layer and the adhesive piece is subsequently
- the present inventors have found that progress is smooth. Therefore, even if the adhesive strength of the adhesive layer is relatively strong, excellent pick-up property can be achieved in the case of a small chip. Further, since the adhesive force of the adhesive layer is relatively strong, DAF skipping in the dicing step can be sufficiently suppressed.
- the present disclosure provides an evaluation method and a selection method for a dicing / die bonding integrated film in consideration of the effects of edge peeling and interfacial peeling of a small chip (area 9 mm 2 or less). Further, the present disclosure discloses a method for evaluating pick-up property in consideration of the influence of edge peeling and interfacial peeling of small chips, and manufacturing of a dicing / die bonding integrated film having excellent pick-up property of small chips and a semiconductor device using the same. Provide a method.
- One aspect of the present disclosure relates to an evaluation method for a dicing / die bonding integrated film.
- This evaluation method is for evaluating the pickability of a dicing / die bonding integrated film applied to a semiconductor device manufacturing process including a step of fragmenting a wafer into a plurality of chips having an area of 9 mm 2 or less.
- This evaluation method includes the following steps (A) to (E), and the peel strength (adhesive strength of the pressure-sensitive adhesive layer) measured in the step (B) is 3.0 N / 25 mm or less and the step (E).
- the edge peeling strength measured in 1 is 1.2 N or less, the dicing / die bonding integrated film is determined to have good pick-up property.
- Step of preparing a die-bonding integrated film to be evaluated including the adhesive layer (B) Adhesive from the adhesive layer under the conditions of a peeling angle of 30 ° and a peeling speed of 60 mm / min at a temperature of 23 ° C. First measurement step of measuring the peel strength of the layer (C) Dying-Die bonding A silicon wafer with a thickness of 50 ⁇ m is attached to the adhesive layer of the integrated film, and dying is applied to the second surface of the adhesive layer.
- Step of attaching the ring A step of separating the silicon wafer and the adhesive layer into a plurality of adhesive pieced chips to obtain a square adhesive pieced chip having a side length of 2 mm
- E A base material at a temperature of 23 ° C.
- the edge peeling strength under the above conditions thickness of silicon wafer, size of chip with adhesive piece, etc.
- the quality of the interfacial peeling property can be judged by measuring the peeling strength of the pressure-sensitive adhesive layer from the adhesive layer under the condition of a peeling angle of 30 °. Therefore, the pick-up property of the dicing / die-bonding integrated film can be efficiently evaluated without actually picking up the film with the die bonder device used for manufacturing the semiconductor device.
- This evaluation method is useful in that, for example, when there is some change in the manufacturing process of a semiconductor device, a dicing / die bonding integrated film suitable for the new manufacturing process can be efficiently selected.
- One aspect of the present disclosure may be to evaluate the pick-up property in the semiconductor device manufacturing process using the dicing / die bonding integrated film.
- This evaluation method includes the following steps. (I) Provided so as to cover the central portion of the base material layer, the pressure-sensitive adhesive layer having the first surface facing the base material layer and the second surface on the opposite side, and the second surface of the pressure-sensitive adhesive layer. Step of preparing a die-bonding / die-bonding integrated film to be evaluated having the adhesive layer (ii) First measuring step of measuring the peeling strength of the pressure-sensitive adhesive layer from the adhesive layer under the condition of a peeling angle of 30 °.
- a step of attaching a wafer having a thickness of 10 to 100 ⁇ m to the adhesive layer of the dicing / die bonding integrated film and attaching a dicing ring to the second surface of the adhesive layer (iv) Wafer and adhesion. Step of individualizing the agent layer into a chip with an adhesive piece of 9 mm 2 or less (v) The central part of the chip with an adhesive piece is pushed from the base material layer side, and the edge of the chip with the adhesive piece is peeled off from the adhesive layer. Second measurement step to measure the edge peeling strength at the time
- This dicing / die bonding integrated film has a base material layer, a pressure-sensitive adhesive layer having a first surface facing the base material layer and a second surface on the opposite side thereof, and a second surface of the pressure-sensitive adhesive layer. It is provided with an adhesive layer provided so as to cover the central portion, and the peel strength of the adhesive layer from the adhesive layer is 3 as measured under the conditions of a peeling angle of 30 ° and a peeling speed of 60 mm / min at a temperature of 23 ° C. It is 0.0 N / 25 mm or less, and the edge peeling strength measured through the following steps is 1.2 N or less.
- ⁇ Measurement of edge peel strength> A process in which a silicon wafer with a thickness of 50 ⁇ m is attached to the adhesive layer and a dicing ring is attached to the second surface of the adhesive layer.-The silicon wafer and the adhesive layer are individually attached to a plurality of chips with adhesive pieces. Step to obtain a square chip with adhesive piece with a side length of 2 mm ⁇ At a temperature of 23 ° C, push the central part of the chip with adhesive piece from the base material layer side at a speed of 60 mm / min, and the edge of the chip with adhesive piece becomes Step to measure edge peeling strength when peeling from adhesive layer
- the edge peeling strength of the chip with adhesive piece (size: 2 mm ⁇ 2 mm) is 1.2 N or less, and the peeling strength of the adhesive layer from the adhesive layer is 3.0 N / 25 mm.
- excellent pick-up property can be achieved in the semiconductor device manufacturing process including the step of individualizing the wafer into a plurality of chips having an area of 9 mm 2 or less.
- the dicing / die bonding integrated film preferably satisfies the conditions of edge peeling strength and interfacial peeling strength of the adhesive pieced chips even when a plurality of adhesive pieced chips are obtained by blade dicing.
- the following technical means may be appropriately adopted. -By making the adhesive layer relatively high in viscosity (high elasticity) or thin (for example, 60 ⁇ m or less), the machinability of the adhesive layer during blade dicing is improved.
- the pressure-sensitive adhesive layer is made relatively highly elastic and the adhesive strength is adjusted.
- the breaking elongation of the base material layer is adjusted.
- Thicken the adhesive layer for example, 30 ⁇ m or more so as not to cut into the base material layer during blade dicing.
- One aspect of the present disclosure relates to a method for manufacturing a semiconductor device.
- This manufacturing method includes the step of preparing the dicing / die bonding integrated film, attaching the wafer to the adhesive layer of the dicing / die bonding integrated film, and dicing the second surface of the adhesive layer.
- the process of attaching the ring, the process of separating the wafer and the adhesive layer into a plurality of chips with adhesive pieces having an area of 9 mm 2 or less, the process of picking up the chips with adhesive pieces from the adhesive layer, and the chips with adhesive pieces. Includes the step of mounting on a substrate or other chip. According to this method for manufacturing a semiconductor device, excellent pick-up performance of a chip with an adhesive piece can be achieved, and the semiconductor device can be manufactured with a sufficiently high yield.
- One aspect of the present disclosure relates to a method for selecting a dicing / die bonding integrated film.
- a dicing / die bonding integrated film capable of manufacturing a semiconductor device with a high yield can be efficiently sorted.
- the first aspect of the method for selecting a dicing / die bonding integrated film is a base material layer, an adhesive layer having a first surface facing the base material layer and a second surface opposite to the base material layer, and an adhesive.
- a second aspect of the method for selecting a dicing / die bonding integrated film is a base material layer, an adhesive layer having a first surface facing the base material layer and a second surface opposite to the base material layer, and an adhesive. From the adhesive layer, each of which includes an adhesive layer provided so as to cover the central portion of the second surface of the layer, and is measured at a temperature of 23 ° C. under the conditions of a peeling angle of 30 ° and a peeling speed of 60 mm / min.
- a step of preparing a plurality of dicing / die bonding integrated films having a peeling strength of the pressure-sensitive adhesive layer of 3.0 N / 25 mm or less and a plurality of dicing / die bonding integrated films are measured through the following steps.
- edge peeling strength is 1.2 N or less.
- ⁇ Measurement of edge peel strength> A process in which a silicon wafer with a thickness of 50 ⁇ m is attached to the adhesive layer and a dicing ring is attached to the second surface of the adhesive layer.-The silicon wafer and the adhesive layer are individually attached to a plurality of chips with adhesive pieces. Step to obtain a square chip with adhesive piece with a side length of 2 mm ⁇ At a temperature of 23 ° C, push the central part of the chip with adhesive piece from the base material layer side at a speed of 60 mm / min, and the edge of the chip with adhesive piece becomes Step to measure edge peeling strength when peeling from adhesive layer
- FIG. 1A is a plan view showing an embodiment of a dicing / diebonding integrated film
- FIG. 1B is a schematic cross-sectional view taken along the line BB shown in FIG. 1A
- 2 (a) to 2 (c) are cross-sectional views schematically showing a step of measuring the edge peeling strength.
- FIG. 3 is a graph showing an example of the relationship between the displacement (mm) due to pushing and the pushing force (N).
- FIG. 4 is a plan view schematically showing a state in which a mark is added at a position corresponding to the central portion of the chip to be measured.
- FIG. 5 is a plan view schematically showing an example of an edge peeling strength measurement area.
- FIG. 1A is a plan view showing an embodiment of a dicing / diebonding integrated film
- FIG. 1B is a schematic cross-sectional view taken along the line BB shown in FIG. 1A.
- 2 (a) to 2 (c) are cross-sectional views schematically showing
- FIG. 6 is a cross-sectional view schematically showing how the 30 ° peel strength of the adhesive layer with respect to the adhesive layer is measured.
- FIG. 7 is a schematic cross-sectional view of an embodiment of the semiconductor device. 8 (a) to 8 (d) are cross-sectional views schematically showing a process of manufacturing a chip with an adhesive piece.
- FIG. 9 is a cross-sectional view schematically showing a process of manufacturing the semiconductor device shown in FIG. 7.
- FIG. 10 is a cross-sectional view schematically showing a process of manufacturing the semiconductor device shown in FIG. 7.
- FIG. 11 is a cross-sectional view schematically showing a process of manufacturing the semiconductor device shown in FIG. 7.
- (meth) acrylic acid means acrylic acid or methacrylic acid
- (meth) acrylate means acrylate or the corresponding methacrylate
- a or B may include either A or B, or both.
- the term “layer” includes not only a structure having a shape formed on the entire surface but also a structure having a shape partially formed when observed as a plan view.
- the term “process” is used not only as an independent process but also as a term as long as the desired action of the process is achieved even when it cannot be clearly distinguished from other processes. included.
- the numerical range indicated by using "-” indicates a range including the numerical values before and after "-" as the minimum value and the maximum value, respectively.
- the content of each component in the composition is the total amount of the plurality of substances present in the composition unless otherwise specified, when a plurality of substances corresponding to each component are present in the composition.
- the exemplary materials may be used alone or in combination of two or more unless otherwise specified.
- the upper limit value or the lower limit value of the numerical range of one step may be replaced with the upper limit value or the lower limit value of the numerical range of another step.
- the upper limit value or the lower limit value of the numerical range may be replaced with the value shown in the examples.
- FIG. 1A is a plan view showing a dicing / diebonding integrated film according to the present embodiment
- FIG. 1B is a schematic cross-sectional view taken along the line BB of FIG.
- the dicing / die bonding integrated film 10 (hereinafter, sometimes simply referred to as “film 10”) includes a dicing step of separating the wafer W into a plurality of chips having an area of 9 mm 2 or less, and a subsequent pick-up step. It is applied to the manufacturing process of a semiconductor device (see FIGS. 8 (c) and 8 (d)).
- the film 10 has a base material layer 1, a pressure-sensitive adhesive layer 3 having a first surface F1 facing the base material layer 1 and a second surface F2 on the opposite side thereof, and a second surface F2 of the pressure-sensitive adhesive layer 3.
- An adhesive layer 5 provided so as to cover the central portion of the above is provided in this order.
- the square base material layer 1 is illustrated, but the base material layer 1 may be circular and have the same size as the pressure-sensitive adhesive layer 3.
- the base material layer 1 has a predetermined length
- the laminated body of the adhesive layer 3 and the adhesive layer 5 may be arranged at predetermined intervals so as to have (100 m or more) and line up in the longitudinal direction thereof.
- the film 10 has an edge peeling strength of 1.2 N or less.
- the edge peel strength is measured through the following steps.
- the upper limit of the edge peeling strength of the film 10 may be 1.1N or 0.9N, and the lower limit may be, for example, 0.1N and 0.15N or 0.2N.
- ⁇ Measurement of edge peel strength> A step of attaching a silicon wafer Ws having a thickness of 50 ⁇ m to the adhesive layer 5 and attaching a dicing ring DR to the second surface F2 of the adhesive layer 3 (see FIG. 2A).
- -A step of separating the silicon wafer Ws and the adhesive layer 5 into a plurality of chips Ta with adhesive pieces hereinafter, may be simply referred to as "chip Ta" (see FIG. 2B).
- the film 10 is suitable for the dicing step of individualizing the wafer into a plurality of small chips having an area of 9 mm 2 or less and the subsequent pick-up step. Can be done.
- the chip Ta is composed of the chip Ts and the adhesive piece 5p.
- the step of separating the silicon wafer Ws and the adhesive layer 5 into a plurality of chips Ta may be carried out, for example, by blade dicing under the following conditions.
- the particles are # 4000 to # 4800. It is preferable to use a blade having a small diameter.
- silicon wafers Ws with a thickness of 50 ⁇ m are as follows. For example, when the thickness of a silicon wafer is 30 ⁇ m or less, problems such as chip chipping and chip cracking are likely to occur when individualizing by blade dicing. In addition to this, the chip may crack when measuring the edge peel strength. On the other hand, for example, when the thickness of the silicon wafer is 80 ⁇ m or more, it may be necessary to apply a step cut when individualizing by blade dicing, which makes it difficult to select the blade and set the conditions. In addition to this, if the chip is thick, the chip is less likely to bend when measuring the edge peeling strength, so that the edge peeling property is improved and the difference between the films may be less likely to occur. Further, since semiconductor wafers have been thinned in recent years, silicon wafers having a thickness of 50 ⁇ m are used in order to match market trends.
- the reason why the size of the tip Ta with adhesive piece was set to 2 mm x 2 mm is as follows. For example, when the size of the tip Ta with adhesive pieces is 1 mm ⁇ 1 mm, the distance between the center of the tip (the place where the pressing force is applied to the tip) and the edge is too close, so that the edge peelability is improved and the film is separated from each other. It may be difficult to make a difference. In addition to this, it is difficult to mark the central part of the chip because the chip is too small, and there is a possibility that a measurement error may occur due to misalignment in visual inspection without marking.
- the pressing force due to pushing is transmitted because the distance between the center and the edge of the tip is too large when measuring the peel strength of the tip edge. It becomes difficult to measure the edge peeling strength accurately. In addition to this, a large amount of pushing is required to peel off the edge, which may cause the chip to bend significantly and crack the chip during measurement.
- the edge peeling strength may be measured under the following conditions using the following devices and the like.
- FIG. 3 is a graph showing an example of the relationship between the displacement (mm) due to pushing and the pushing force (N).
- the pushing force temporarily decreases, and a change point occurs in the graph.
- the value of the pushing force at this change point is defined as the edge peeling strength.
- the pushing speed is preferably 60 to 1200 mm / min (1 to 20 mm / sec) in the sense of matching with the actual pickup conditions. For example, if the pushing speed is too fast, it takes time to stop pushing after the edge is peeled off. An excessive pressing force is applied to the sample, and the chips around the chip to be measured may be peeled off or the base material layer may be torn, which may adversely affect the subsequent measurement. Therefore, the pushing speed as low as possible was selected within the above range.
- FIG. 4 is a plan view schematically showing a state in which a mark M is attached to a position corresponding to the central portion of the chip to be measured. In this figure, three chips are spaced between the two chips Ta to be measured.
- the silicon wafer Ws is a 12-inch wafer
- the measurement area A is not limited to the position shown in FIG. 5, and may be, for example, the upper side, the left side, or the right side in FIG. 5 as long as there is a predetermined distance from the end portion of the wafer Ws.
- the pick-up property may be evaluated by actually picking up the same sample using a die bonder device. In this case, it is preferable to measure the edge peeling strength first. Pickup using a die bonder device is usually performed with the base film expanded. After the expanded state is released, the slack of the base material layer 1 due to the expansion may not be restored, and it may be difficult to accurately measure the edge peeling strength.
- the adhesive force of the first region 3a with respect to the adhesive layer 5 is 3.0 N / 25 mm or less.
- the upper limit of this adhesive strength may be 2.75 N / 25 mm or 2.5 N / 25 mm.
- This adhesive strength is a 30 ° peel strength measured under the conditions of a peeling angle of 30 ° and a peeling speed of 60 mm / min at a temperature of 23 ° C.
- FIG. 6 is a cross-sectional view schematically showing how the 30 ° peel strength of the adhesive layer 3 is measured with the adhesive layer 5 of the measurement sample (width 25 mm ⁇ length 100 mm) fixed to the support plate 80. Is.
- this adhesive force is preferably 1.2 N / 25 mm or more.
- base material layer As the base material layer 1, a known polymer sheet or film can be used, and there is no particular limitation as long as the expanding step can be carried out even under low temperature conditions.
- the polymer constituting the base material layer crystalline polypropylene, amorphous polypropylene, high density polyethylene, medium density polyethylene, low density polyethylene, ultra low density polyethylene, low density linear polyethylene, polybutene, poly Polyethylene such as methylpentene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester (random, alternating) copolymer, ethylene-butene copolymer Combined, ethylene-hexene copolymer, polyurethane, polyethylene terephthalate, polyethylene naphthalate and other polyesters, polycarbonate, polyimide, polyether ether ketone, polyimide, polyetherimide, polyamide, total
- the base material layer 1 has a surface containing at least one resin selected from polyethylene, polypropylene, a polyethylene-polypropylene random copolymer, and a polyethylene-polypropylene block copolymer as a main component, and this surface and the pressure-sensitive adhesive layer 3 Are preferably in contact with each other.
- These resins are good base materials from the viewpoints of properties such as Young's modulus, stress relaxation property and melting point, as well as price and waste material recycling after use.
- the base material layer 1 may be a single layer, but may have a multilayer structure in which layers made of different materials are laminated, if necessary.
- the surface of the base material layer 1 may be subjected to a surface roughness treatment such as a matte treatment or a corona treatment.
- the thickness of the base material layer 1 is, for example, 10 to 200 ⁇ m, and may be 20 to 180 ⁇ m or 30 to 150 ⁇ m.
- the pressure-sensitive adhesive layer 3 includes a first region 3a including at least a region Rw corresponding to a bonding position of the silicon wafer Ws in the adhesive layer 5, and a second region 3b located so as to surround the first region 3a.
- the broken lines in FIGS. 1 (a) and 1 (b) indicate the boundary between the first region 3a and the second region 3b.
- the first region 3a and the second region 3b consist of the same composition before irradiation with active energy rays.
- the first region 3a is a region in which the adhesive strength is reduced as compared with the second region 3b by being irradiated with active energy rays such as ultraviolet rays.
- the second region 3b is a region to which the dicing ring DR is attached (see FIG. 2A).
- the second region 3b is a region not irradiated with active energy rays and has a high adhesive force to the dicing ring DR.
- the thickness of the pressure-sensitive adhesive layer 3 may be appropriately set according to the conditions (temperature, tension, etc.) of the expanding step, and may be, for example, 1 to 200 ⁇ m, 5 to 50 ⁇ m, or 15 to 45 ⁇ m. If the thickness of the pressure-sensitive adhesive layer 3 is less than 1 ⁇ m, the adhesiveness tends to be insufficient, and if it exceeds 200 ⁇ m, the calf width is narrow during expansion (stress is relaxed when the pin is pushed up), and pickup tends to be insufficient. ..
- the first region 3a has an adhesive force in the above range (3.0 N / 25 mm or less) with respect to the adhesive layer 5, and is formed by irradiation with active energy rays.
- the present inventors have found that reducing the adhesive strength of the pressure-sensitive adhesive layer 3 by irradiation with active energy rays affects the edge peeling strength of a chip with an adhesive piece. That is, if the adhesive strength of the first region 3a is excessively reduced by irradiation with active energy rays, the 30 ° peel strength of the first region 3a with respect to the adhesive layer 5 becomes low, but the pickup target is small.
- the adhesive force of the first region 3a with respect to the adhesive layer 5 is preferably one in which the adhesive force before irradiation with the active energy ray is not excessively reduced, whereby the adhesive piece having an area of 9 mm 2 or less is attached. Even if it is a chip, its edge is easily peeled off from the pressure-sensitive adhesive layer 3 (first region 3a).
- the adhesion of the first region 3a of the pressure-sensitive adhesive layer 3 3a can be adjusted.
- the adhesive strength of the second region 3b to the stainless steel substrate is preferably 0.2 N / 25 mm or more.
- This adhesive strength is a 90 ° peel strength measured under the conditions of a peeling angle of 90 ° and a peeling speed of 50 mm / min at a temperature of 23 ° C.
- This adhesive force is 0.2 N / 25 mm or more, it is possible to sufficiently suppress ring peeling during dicing.
- the lower limit of the adhesive strength may be 0.3 N / 25 mm or 0.4 N / 25 mm, and the upper limit may be, for example, 2.0 N / 25 mm and 1.0 N / 25 mm.
- the pressure-sensitive adhesive layer before irradiation with active energy rays is composed of, for example, a pressure-sensitive adhesive composition containing a (meth) acrylic resin, a photopolymerization initiator, and a cross-linking agent.
- the second region 3b which is not irradiated with the active energy ray, has the same composition as the pressure-sensitive adhesive layer before the irradiation with the active energy ray.
- the components contained in the pressure-sensitive adhesive composition will be described in detail.
- the pressure-sensitive adhesive composition preferably contains a (meth) acrylic resin having a chain-polymerizable functional group, and the functional group is preferably at least one selected from an acryloyl group and a methacryloyl group.
- the content of the functional group in the pressure-sensitive adhesive layer before irradiation with active energy rays is, for example, 0.1 to 1.2 mmol / g, and 0.3 to 1.0 mmol / g or 0.5 to 0.8 mmol / g. It may be g.
- the content of the functional group is 0.1 mmol / g or more, it is easy to form a region (first region 3a) in which the adhesive strength is appropriately reduced by irradiation with active energy rays, while 1.2 mmol / g / g. When it is g or less, it is easy to achieve excellent pick-up property.
- the (meth) acrylic resin can be obtained by synthesizing it by a known method.
- the synthesis method include a solution polymerization method, a suspension polymerization method, an emulsion polymerization method, a massive polymerization method, a precipitation polymerization method, a vapor phase polymerization method, a plasma polymerization method, and a supercritical polymerization method.
- the types of polymerization reactions include radical polymerization, cationic polymerization, anionic polymerization, living radical polymerization, living cationic polymerization, living anionic polymerization, coordination polymerization, immodal polymerization, etc., as well as ATRP (atomic transfer radical polymerization) and RAFT (Atomic transfer radical polymerization).
- the synthesis by radical polymerization using the solution polymerization method has good economic efficiency, high reaction rate, easy polymerization control, etc., and can be blended by using the resin solution obtained by polymerization as it is. It has advantages such as.
- the monomer used when synthesizing the (meth) acrylic resin is not particularly limited as long as it has one (meth) acryloyl group in one molecule. Specific examples thereof include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, butoxyethyl (meth) acrylate, and isoamyl (meth) acrylate.
- Aromatic (meth) acrylate 2-tetrahydrofurfuryl (meth) acrylate, N- (meth) acryloyloxyethyl hexahydrophthalimide, 2- (meth) acryloyloxyethyl-N-carbazole, etc.
- Meta acrylate, these caprolactone modified products, ⁇ -carboxy-polycaprolactone mono (meth) acrylate, glycidyl (meth) acrylate, ⁇ -ethylglycidyl (meth) acrylate, ⁇ -propyl glycidyl (meth) acrylate, ⁇ -butyl glycidyl (Meta) acrylate, 2-methylglycidyl (meth) acrylate, 2-ethylglycidyl (meth) acrylate, 2-propylglycidyl (meth) acrylate, 3,4-epoxybutyl (meth) acrylate, 3,4-epoxyheptyl ( Meta) acrylate, ⁇ -ethyl-6,7-epoxyheptyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, o-vinylbenzyl glycidy
- the (meth) acrylic resin preferably has at least one functional group selected from a hydroxyl group, a glycidyl group, an amino group and the like as a reaction point with a functional group-introducing compound or a cross-linking agent described later.
- the monomer for synthesizing the (meth) acrylic resin having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 3-chloro-2.
- Examples thereof include compounds having an ethylenically unsaturated group and a hydroxyl group such as -hydroxypropyl (meth) acrylate and 2-hydroxybutyl (meth) acrylate, and these may be used alone or in combination of two or more. Can be done.
- Examples of the monomer for synthesizing a (meth) acrylic resin having a glycidyl group include glycidyl (meth) acrylate, ⁇ -ethylglycidyl (meth) acrylate, ⁇ -propyl glycidyl (meth) acrylate, and ⁇ -butyl glycidyl (meth).
- the (meth) acrylic resin synthesized from these monomers preferably contains a functional group capable of chain polymerization.
- the chain-growthable functional group is, for example, at least one selected from an acryloyl group and a methacryloyl group.
- the chain-growth-capable functional group is introduced into the (meth) acrylic resin, for example, by reacting the (meth) acrylic resin synthesized as described above with the following compound (functional group-introduced compound). be able to.
- the functional group-introduced compound examples include 2-methacryloyloxyethyl isocyanate, meta-isopropenyl- ⁇ , ⁇ -dimethylbenzyl isocyanate, methacryloylisocyanate, allylisocyanate, 1,1- (bisacryloyloxymethyl) ethyl isocyanate; diisocyanate compound.
- an acryloyl monoisocyanate compound obtained by reacting a polyisocyanate compound with hydroxyethyl (meth) acrylate or 4-hydroxybutylethyl (meth) acrylate; a diisocyanate compound or a polyisocyanate compound, a polyol compound, and hydroxyethyl (meth).
- examples thereof include an acryloyl monoisocyanate compound obtained by reacting with acrylate.
- 2-methacryloyloxyethyl isocyanate is particularly preferable.
- One of these compounds may be used alone, or two or more of these compounds may be used in combination.
- the weight average molecular weight (Mw) of the (meth) acrylic resin is, for example, 100,000 to 2 million or more, preferably 150,000 to 1,000,000, and more preferably 200,000 to 800,000.
- Mw weight average molecular weight of the (meth) acrylic resin
- the hydroxyl value of the (meth) acrylic resin is preferably 10 to 150 mgKOH / g, more preferably 20 to 100 mgKOH / g.
- the initial adhesive force can be adjusted by the reaction with the cross-linking agent, and the peeling force after the reaction of the chain-polymerizable functional group is reduced. Played.
- the photopolymerization initiator is not particularly limited as long as it generates an active species capable of chain polymerization by irradiating it with active energy rays (at least one selected from ultraviolet rays, electron beams and visible light), for example.
- active energy rays at least one selected from ultraviolet rays, electron beams and visible light
- Photo-radical polymerization initiator at least one selected from ultraviolet rays, electron beams and visible light
- the chain-growth-capable active species means one in which the polymerization reaction is started by reacting with a chain-polymerizable functional group.
- photoradical polymerization initiator examples include benzoinketals such as 2,2-dimethoxy-1,2-diphenylethane-1-one; 1-hydroxycyclohexylphenylketone and 2-hydroxy-2-methyl-1-phenylpropane-1.
- ⁇ -hydroxyketones such as 1- [4- (2-hydroxyethoxy) phenyl] -2-hydroxy-2-methyl-1-propane-1-one; 2-benzyl-2-dimethylamino-1-one ⁇ -aminoketones such as (4-morpholinophenyl) -butane-1-one, 1,2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one; 1- [4 -(Phenylthio) phenyl] -1,2-octadionone-2- (benzoyl) oxime and other oxime esters; bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) -2 , 4,4-trimethylpentylphosphine oxide, phosphine oxides such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide; 2- (
- the content of the photopolymerization initiator in the pressure-sensitive adhesive composition is, for example, 0.1 to 30 parts by mass and 0.3 to 10 parts by mass with respect to 100 parts by mass of the content of the (meth) acrylic resin. It is preferably 0.5 to 5 parts by mass, and more preferably 0.5 to 5 parts by mass. If the content of the photopolymerization initiator is less than 0.1 parts by mass, the pressure-sensitive adhesive layer is insufficiently cured after irradiation with active energy rays, and pickup failure is likely to occur. If the content of the photopolymerization initiator exceeds 30 parts by mass, contamination of the adhesive layer (transfer of the photopolymerization initiator to the adhesive layer) is likely to occur.
- the cross-linking agent is used, for example, for the purpose of controlling the elastic modulus and / or the adhesiveness of the pressure-sensitive adhesive layer.
- the cross-linking agent may be a compound having two or more functional groups in one molecule capable of reacting with at least one functional group selected from the hydroxyl group, glycidyl group, amino group and the like possessed by the (meth) acrylic resin. ..
- Examples of the bond formed by the reaction between the cross-linking agent and the (meth) acrylic resin include an ester bond, an ether bond, an amide bond, an imide bond, a urethane bond, and a urea bond.
- a compound having two or more isocyanate groups in one molecule as the cross-linking agent.
- a compound having two or more isocyanate groups in one molecule it can easily react with the hydroxyl group, glycidyl group, amino group and the like contained in the (meth) acrylic resin to form a strong crosslinked structure.
- Compounds having two or more isocyanate groups in one molecule include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylene diisocyanate, and diphenylmethane-4.
- the above-mentioned isocyanate compound and a reaction product of a polyhydric alcohol having two or more OH groups in one molecule may be adopted.
- polyhydric alcohols having two or more OH groups in one molecule include ethylene glycol, propylene glycol, butylene glycol, 1,6-hexanediol, 1,8-octanediol, 1,9-nonanediol, Examples thereof include 1,10-decanediol, 1,11-undecanediol, 1,12-dodecanediol, glycerin, pentaerythritol, dipentaerythritol, 1,4-cyclohexanediol and 1,3-cyclohexanediol.
- a cross-linking agent a reaction product of a polyfunctional isocyanate having two or more isocyanate groups in one molecule and a polyhydric alcohol having three or more OH groups in one molecule (isocyanate group-containing oligomer). Is even more desirable.
- the pressure-sensitive adhesive layer 3 forms a dense cross-linked structure, which can sufficiently suppress the pressure-sensitive adhesive from adhering to the adhesive layer 5 in the pick-up step. ..
- the content of the cross-linking agent in the pressure-sensitive adhesive composition may be appropriately set according to the cohesive force and the elongation at break required for the pressure-sensitive adhesive layer, the adhesion to the pressure-sensitive adhesive layer 5, and the like.
- the content of the cross-linking agent is, for example, 2 to 30 parts by mass, 4 to 15 parts by mass, or 7 to 10 parts by mass with respect to 100 parts by mass of the content of the (meth) acrylic resin. You may.
- the content of the cross-linking agent is less than 2 parts by mass with respect to 100 parts by mass of the content of the (meth) acrylic resin, the formation of the cross-linked structure tends to be insufficient, and due to this, adhesion is performed in the pickup process.
- the interfacial adhesion with the agent layer 5 is not sufficiently reduced, and defects are likely to occur during pickup.
- the content of the cross-linking agent exceeds 30 parts by mass with respect to the content of 100 parts by mass of the (meth) acrylic resin, the pressure-sensitive adhesive layer 3 tends to become excessively hard, and due to this, in the expanding step.
- the semiconductor chip is easily peeled off.
- the content of the cross-linking agent with respect to the total mass of the pressure-sensitive adhesive composition is, for example, 0.1 to 20% by mass, and may be 2 to 17% by mass or 3 to 15% by mass.
- the content of the cross-linking agent is 0.1% by mass or more, it is easy to form a region (first region 3a) in which the adhesive strength is appropriately reduced by irradiation with active energy rays, while the content is 15% by mass or less. By being there, it is easy to achieve excellent pickup performance.
- a known method can be adopted.
- a laminate of the base material layer 1 and the pressure-sensitive adhesive layer 3 may be formed by a two-layer extrusion method, or a varnish for forming the pressure-sensitive adhesive layer 3 may be prepared and applied to the surface of the base material layer 1.
- the pressure-sensitive adhesive layer 3 may be formed on the film which has been processed or released and transferred to the base material layer 1.
- the varnish for forming the pressure-sensitive adhesive layer 3 is preferably prepared by using an organic solvent capable of dissolving the (meth) acrylic resin, the photopolymerization initiator and the cross-linking agent, which volatilizes by heating.
- organic solvent include aromatic hydrocarbons such as toluene, xylene, mesityrene, cumene and p-simene; cyclic ethers such as tetrahydrofuran and 1,4-dioxane; methanol, ethanol, isopropanol, butanol, ethylene glycol and propylene.
- Alcohols such as glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone; methyl acetate, ethyl acetate, butyl acetate, methyl lactate, ethyl lactate, ⁇ -butyrolactone, etc.
- Carbonated esters such as ethylene carbonate and propylene carbonate; ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol Polyhydric alcohol alkyl ethers such as dimethyl ether, propylene glycol diethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether; ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol mono Polyhydric alcohol alkyl ether acetates such as butyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monomethyl
- toluene for example, toluene, methanol, ethanol, isopropanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, methyl acetate, ethyl acetate, butyl acetate, ethylene glycol monomethyl ether, ethylene glycol mono Ethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, diethylene glycol dimethyl ether, ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, N, N-dimethylacetamide, and acetylacetone are preferable.
- One of these organic solvents may be used alone, or two or more of them may be used in combination.
- the solid content concentration of the varnish is usually preferably 10 to 60% by mass.
- the adhesive composition constituting the adhesive layer 5 preferably contains an epoxy group-containing acrylic copolymer, an epoxy resin, and an epoxy resin curing agent. According to the adhesive layer 5 containing these components, the adhesiveness between chips / substrates and between chips / chips is excellent, electrode embedding property and wire embedding property can be imparted, and adhesion is performed at a low temperature in the die bonding process. It is preferable because it can be formed, excellent curing can be obtained in a short time, and it has excellent reliability after molding with a sealing agent.
- the thickness of the adhesive layer 5 is, for example, 1 to 300 ⁇ m, preferably 5 to 150 ⁇ m, and may be 10 to 100 ⁇ m or 15 to 35 ⁇ m. If the thickness of the adhesive layer 5 is less than 1 ⁇ m, the adhesiveness tends to be insufficient, while if it exceeds 300 ⁇ m, the dicing property and the pick-up property tend to be insufficient.
- epoxy resin examples include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, alicyclic epoxy resin, aliphatic chain epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, and the like.
- Bisphenol A novolac type epoxy resin diglycidyl etherified product of biphenol, diglycidyl etherified product of naphthalenediol, diglycidyl etherified product of phenols, diglycidyl etherified product of alcohols, and alkyl substituents and halides thereof.
- Bifunctional epoxy resin such as hydrogen additive, novolac type epoxy resin and the like.
- epoxy resins such as a polyfunctional epoxy resin and a heterocycle-containing epoxy resin may be applied. These can be used alone or in combination of two or more.
- a component other than the epoxy resin may be contained as an impurity as long as the characteristics are not impaired.
- Examples of the epoxy resin curing agent include a phenol resin obtained by reacting a phenol compound with a xylylene compound which is a divalent linking group in the presence of a catalyst or an acid catalyst.
- Examples of the phenolic compound used in the production of the phenol resin include phenol, o-cresol, m-cresol, p-cresol, o-ethylphenol, p-ethylphenol, on-propylphenol, mn-propylphenol, and the like.
- phenol compounds may be used alone or in combination of two or more.
- the xylylene compound which is a divalent linking group used for producing a phenol resin the following xylylene halides, xylylene diglycols and derivatives thereof can be used.
- mineral acids such as hydrochloric acid, sulfuric acid, phosphoric acid and polyphosphoric acid
- organic substances such as dimethylsulfate, diethylsulfate, p-toluenesulfonic acid, methanesulfonic acid and ethanesulfonic acid.
- Carboxy acids Super strong acids such as trifluoromethanesulfonic acid; Strongly acidic ion exchange resins such as alcan sulfonic acid type ion exchange resin; Super strong acidic ion exchange such as perfluoroalkane sulfonic acid type ion exchange resin Resins (trade names: Nafion, Nafion, manufactured by Du Pont, "Nafion” is a registered trademark); natural and synthetic zeolites; using acidic catalysts such as active white clay (acidic white clay), substantially at 50 to 250 ° C. It is obtained by reacting until the xylylene compound as a raw material disappears and the reaction composition becomes constant. The reaction time depends on the raw material and the reaction temperature, but is about 1 hour to 15 hours. Actually, the reaction composition may be determined by tracking the reaction composition by GPC (gel permeation chromatography) or the like.
- GPC gel permeation chromatography
- the epoxy group-containing acrylic copolymer is preferably a copolymer obtained by using glycidyl acrylate or glycidyl methacrylate as a raw material in an amount of 0.5 to 6% by mass with respect to the obtained copolymer.
- this amount is 0.5% by mass or more, high adhesive strength can be easily obtained, while when it is 6% by mass or less, gelation can be suppressed.
- a mixture of alkyl acrylates having an alkyl group having 1 to 8 carbon atoms such as methyl acrylate and methyl methacrylate, alkyl methacrylate, and styrene and acrylonitrile can be used.
- the mixing ratio is preferably adjusted in consideration of the Tg of the copolymer. If the Tg is less than ⁇ 10 ° C., the tackiness of the adhesive layer 5 in the B stage state tends to increase, and the handleability tends to deteriorate.
- the upper limit of the glass transition point (Tg) of the epoxy group-containing acrylic copolymer is, for example, 30 ° C.
- the polymerization method is not particularly limited, and examples thereof include pearl polymerization and solution polymerization. Examples of commercially available epoxy group-containing acrylic copolymers include HTR-860P-3 (trade name, manufactured by Nagase ChemteX Corporation).
- the weight average molecular weight of the epoxy group-containing acrylic copolymer is 100,000 or more, and in this range, the adhesiveness and heat resistance are high, preferably 300,000 to 3 million, and preferably 500,000 to 2 million. Is more preferable. When the weight average molecular weight is 3 million or less, it is possible to suppress a decrease in the filling property between the semiconductor chip and the substrate supporting the semiconductor chip.
- the weight average molecular weight is a polystyrene-equivalent value using a calibration curve of standard polystyrene by gel permeation chromatography (GPC).
- the adhesive layer 5 may further contain a curing accelerator such as a tertiary amine, imidazoles, or a quaternary ammonium salt, if necessary.
- a curing accelerator such as a tertiary amine, imidazoles, or a quaternary ammonium salt
- Specific examples of the curing accelerator include 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-cyanoethyl-2-phenylimidazole, and 1-cyanoethyl-2-phenylimidazolium trimerite. One of these may be used alone, or two or more thereof may be used in combination.
- the adhesive layer 5 may further contain an inorganic filler, if necessary.
- the inorganic filler include aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, aluminum oxide, aluminum nitride, aluminum borate whisker, and boron nitride.
- examples include crystalline silica and amorphous silica. One of these may be used alone, or two or more thereof may be used in combination.
- the adhesive layer 5 may not contain a thermosetting resin.
- the adhesive layer 5 contains a reactive group-containing (meth) acrylic copolymer
- the adhesive layer 5 contains a reactive group-containing (meth) acrylic copolymer, a curing accelerator, and a filler. Anything is fine.
- the method for producing the film 10 is to form on the surface of the base material layer 1 a pressure-sensitive adhesive layer composed of a pressure-sensitive adhesive composition whose adhesive strength is reduced by irradiation with active energy rays, and on the surface of the pressure-sensitive adhesive layer.
- a step of producing a laminated body including the adhesive layer 5 and a step of irradiating a region to be a first region 3a of the pressure-sensitive adhesive layer contained in the laminated body with active energy rays are included in this order.
- the dose of the active energy ray to the area to be the first region 3a is, for example, 10 ⁇ 1000mJ / cm 2, may be 100 ⁇ 700mJ / cm 2 or 200 ⁇ 500mJ / cm 2.
- the method for producing the film 10 includes a step of forming a pressure-sensitive adhesive layer made of a composition whose adhesive strength is reduced by irradiation with active energy rays on the surface of the base material layer 1, and a step of forming the pressure-sensitive adhesive layer.
- the step of irradiating the region to be the region 3a of 1 with the active energy ray and the step of laminating the adhesive layer 5 on the surface of the adhesive layer 3 after irradiating the active energy ray are included in this order. You can.
- FIG. 7 is a cross-sectional view schematically showing the semiconductor device according to the present embodiment.
- the semiconductor device 100 shown in this figure includes a substrate 70, four chips T1, T2, T3, and T4 laminated on the surface of the substrate 70, electrodes (not shown) on the surface of the substrate 70, and four chips T1.
- T2, T3, and T4 are provided with wires W1, W2, W3, and W4 for electrically connecting the wires, and a sealing layer 50 for covering them.
- the substrate 70 is, for example, an organic substrate and may be a metal substrate such as a lead frame. From the viewpoint of suppressing the warp of the semiconductor device 100, the thickness of the substrate 70 is, for example, 70 to 140 ⁇ m, and may be 80 to 100 ⁇ m.
- the four chips T1, T2, T3, and T4 are laminated via a cured product 5c of the adhesive piece 5p.
- the shape of the chips T1, T2, T3, and T4 in a plan view is, for example, a square or a rectangle.
- the area of the chips T1, T2, T3, and T4 is 9 mm 2 or less, and may be 0.1 to 4 mm 2 or 0.1 to 2 mm 2 .
- the length of one side of the chips T1, T2, T3, and T4 is, for example, 3 mm or less, and may be 0.1 to 2.0 mm or 0.1 to 1.0 mm.
- the thickness of the chips T1, T2, T3, and T4 is, for example, 10 to 170 ⁇ m, and may be 25 to 100 ⁇ m.
- the length of one side of the four chips T1, T2, T3, and T4 may be the same or different from each other, and the thickness is also the same.
- the method for manufacturing the semiconductor device 100 includes the step of preparing the film 10 described above, the wafer W being attached to the adhesive layer 5 of the film 10, and the dicing ring DR on the second surface F2 of the adhesive layer 3.
- the above-mentioned film 10 is prepared. As shown in FIGS. 8A and 8B, the film 10 is attached so that the adhesive layer 5 is in contact with one surface of the wafer W. Further, the dicing ring DR is attached to the second surface F2 of the pressure-sensitive adhesive layer 3.
- the wafer W is fragmented into chips T1, T2, T3, and T4.
- the adhesive layer 5 is also individualized to become an adhesive piece 5p.
- Examples of the dicing method include a method using a dicing blade or a laser.
- the wafer W may be thinned by grinding the wafer W prior to dicing the wafer W.
- the adhesive layer 3 is separated from each other by expanding the base material layer 1 under normal temperature or cooling conditions as shown in FIG. 8 (d) without irradiating the pressure-sensitive adhesive layer 3 with active energy rays.
- the adhesive piece 5p is peeled off from the adhesive layer 3 by pushing up with the pin 42, and the tip Tb with the adhesive piece is sucked by the suction collet 44 and picked up.
- the manufacturing method of the semiconductor device 100 will be specifically described with reference to FIGS. 9 to 11.
- the first-stage chip T1 is crimped to a predetermined position on the substrate 70 via the adhesive piece 5p.
- the adhesive piece 5p is cured by heating.
- the adhesive piece 5p is cured to become a cured product 5c.
- the curing treatment of the adhesive piece 5p may be carried out in a pressurized atmosphere from the viewpoint of reducing voids.
- the second-stage chip T2 is mounted on the surface of the chip T1 in the same manner as the mounting of the chip T1 on the substrate 70. Further, the structure 60 shown in FIG. 10 is manufactured by mounting the third-stage and fourth-stage chips T3 and T4. After the chips T1, T2, T3, T4 and the substrate 70 are electrically connected by wires W1, W2, W3, W4 (see FIG. 11), the semiconductor element and the wire are covered with the sealing layer 50, as shown in FIG. The semiconductor device 100 shown is completed.
- the film 10 may further include a cover film (not shown) that covers the adhesive layer 5.
- a cover film (not shown) that covers the adhesive layer 5.
- the adhesive strength of the first region 3a of the pressure-sensitive adhesive layer 3 is reduced as compared with the second region 3b by irradiation with active energy rays is illustrated, but the pressure-sensitive adhesive layer 3 is illustrated. May be UV curable or pressure sensitive.
- the peel strength of the adhesive layer from the adhesive layer and the edge peel strength may be used for selecting the dicing / die bonding integrated film.
- the method for selecting the dicing / die bonding integrated film according to the first aspect includes a step of preparing two or more types of dicing / die bonding integrated film and an adhesive layer of two or more types of dicing / die bonding integrated film. Includes a step of comparing the peeling strength of the pressure-sensitive adhesive layer from and the edge peeling strength.
- the method for selecting the dicing / die bonding integrated film according to the second aspect is the peeling strength of the adhesive layer from the adhesive layer, which is measured under the conditions of a peeling angle of 30 ° and a peeling speed of 60 mm / min at a temperature of 23 ° C.
- this selection method for example, when a plurality of dicing / die bonding integrated films that have been inspected that the peel strength of the adhesive layer from the adhesive layer is 3.0 N / 25 mm or less is purchased, these dicing / die bonding films are used. It is useful for efficiently selecting a dicing / die bonding integrated film capable of producing a semiconductor device with a high yield from the die bonding integrated film.
- the plurality of dicing / die bonding integrated films referred to here may be of the same type or different types.
- the solution containing the acrylic resin (A) obtained as described above was vacuum dried at 60 ° C. overnight.
- the solid content obtained by this was elementally analyzed by a fully automatic elemental analyzer (manufactured by Elemental, trade name: varioEL), and the content of the introduced 2-methacryloyloxyethyl isocyanate was calculated from the nitrogen content. , 0.50 mmol / g.
- the polystyrene-equivalent weight average molecular weight of (A) acrylic resin was determined using the following device. That is, SD-8022 / DP-8020 / RI-8020 manufactured by Tosoh Corporation was used, Gelpack GL-A150-S / GL-A160-S manufactured by Hitachi Chemical Co., Ltd. was used for the column, and tetrahydrofuran was used as the eluent. GPC measurement was performed. As a result, the polystyrene-equivalent weight average molecular weight was 800,000. The hydroxyl value and acid value measured according to the method described in JIS K0070 were 56.1 mgKOH / g and 6.5 mgKOH / g. These results are summarized in Table 1.
- Example 1 [Preparation of dicing film (adhesive layer)] A varnish for forming an adhesive layer was prepared by mixing the following components (see Table 2). The amount of ethyl acetate (solvent) was adjusted so that the total solid content of the varnish was 25% by mass.
- Ciba Specialty Chemicals Co., Ltd., Irgacure 127, "Irgacure” is a registered trademark): 1.0 g
- a polyethylene terephthalate film (width 450 mm, length 500 mm, thickness 38 ⁇ m) with a mold release treatment on one surface was prepared.
- a varnish for forming an adhesive layer was applied to the surface subjected to the mold release treatment using an applicator, and then dried at 80 ° C. for 5 minutes.
- a laminate (dicing film) composed of a polyethylene terephthalate film and an adhesive layer having a thickness of 30 ⁇ m formed on the polyethylene terephthalate film was obtained.
- a polyolefin film (width 450 mm, length 500 mm, thickness 80 ⁇ m) with corona treatment on one side was prepared.
- the surface treated with corona and the adhesive layer of the laminated body were bonded together at room temperature.
- the pressure-sensitive adhesive layer was transferred to the polyolefin film (cover film) by pressing with a rubber roll. Then, it was left at room temperature for 3 days to obtain a dicing film with a cover film.
- -Epoxy resin (YDCN-700-10 (trade name), Cresol novolac type epoxy resin manufactured by Nippon Steel & Sumitomo Metal Chemical Co., Ltd., epoxy equivalent 210, molecular weight 1200, softening point 80 ° C.): 14 parts by mass-phenol resin (Millex XLC-LL) (Product name), manufactured by Mitsui Kagaku Co., Ltd., phenol resin, hydroxyl group equivalent 175, water absorption rate 1.8%, heating weight reduction rate at 350 ° C.
- silane coupling agent NUC A-189 (NUC A-189) Product name
- ⁇ -mercaptopropyltrimethoxysilane manufactured by NUC Co., Ltd. 0.2 parts by mass silane coupling agent (NUCA-1160 (trade name), manufactured by Nippon Unicar Co., Ltd., ⁇ -ureidopropyltriethoxysilane) : 0.1 part by mass / filler ("SC2050-HLG (trade name), manufactured by Admatex Co., Ltd., silica, average particle size 0.500 ⁇ m): 32 parts by mass
- a varnish for forming an adhesive layer was obtained through the steps of stirring and mixing and vacuum degassing.
- ⁇ Epoxy group-containing acrylic copolymer (HTR-860P-3 (trade name), manufactured by Nagase ChemteX Corporation, weight average molecular weight 800,000): 16 parts by mass
- Curing accelerator (Curesol 2PZ-CN (trade name), 1-Cyanoethyl-2-phenylimidazole manufactured by Shikoku Kasei Kogyo Co., Ltd., "Curesol” is a registered trademark) 0.0.1 parts by mass
- a polyethylene terephthalate film (thickness 35 ⁇ m) with a mold release treatment on one surface was prepared.
- a varnish for forming an adhesive layer was applied to the surface subjected to the mold release treatment using an applicator, and then heat-dried at 140 ° C. for 5 minutes.
- a laminate (die bonding film) composed of a polyethylene terephthalate film (carrier film) and an adhesive layer (B stage state) having a thickness of 25 ⁇ m formed therein was obtained.
- a die bonding film composed of an adhesive layer and a carrier film was cut into a circle having a diameter of 335 mm together with the carrier film.
- a dicing film from which the polyethylene terephthalate film was peeled off was attached to this at room temperature, and then left at room temperature for 1 day. Then, the dicing film was cut into a circle having a diameter of 370 mm.
- the region (first region of the adhesive layer) corresponding to the bonding position of the wafer in the adhesive layer of the dicing / die bonding integrated film thus obtained was irradiated with ultraviolet rays as follows.
- a pulsed xenon lamp was used to partially irradiate ultraviolet rays at an irradiation amount of 70 W and 300 mJ / cm 2 .
- An ultraviolet ray was irradiated to a portion having an inner diameter of 318 mm from the center of the film using a blackout curtain. In this way, a plurality of dicing / die bonding integrated films for use in various evaluation tests described later were obtained.
- Example 2 When making the dicing film, 1-hydroxy-cyclohexyl-phenyl-ketone, manufactured by Chivas Specialty Chemicals Co., Ltd., Irgacure 184, "Irgacure” is a registered trademark) was used instead of "Irgacure 127", and ultraviolet rays.
- a plurality of dicing / die bonding integrated films were obtained in the same manner as in Example 1 except that the irradiation amount was set to 200 mJ / cm 2 instead of 300 mJ / cm 2 .
- Example 3 The irradiation amount of ultraviolet rays instead of the 200 mJ / cm 2, other that was 250 mJ / cm 2 in the same manner as in Example 2 to obtain a plurality of dicing die bonding integrated film.
- Example 4 A plurality of dicing / die bonding integrated films were obtained in the same manner as in Example 2 except that the irradiation amount of ultraviolet rays was set to 300 mJ / cm 2 instead of 200 mJ / cm 2 .
- Example 5 As the die bonding film, a plurality of dicing die bonding is carried out in the same manner as in Example 4 except that a film having an adhesive layer B formed as follows is used instead of the one having the adhesive layer A. An integral film was obtained.
- die bonding film adhesive layer B
- cyclohexanone solvent
- -Filler SC2050-HLG (trade name), manufactured by Admatex Co., Ltd., silica, average particle size 0.500 ⁇ m
- a varnish for forming an adhesive layer was obtained through the steps of mixing and vacuum degassing.
- -Epoxy group-containing acrylic copolymer (HTR-860P-3 (trade name), manufactured by Nagase ChemteX Corporation, weight average molecular weight 800,000): 100 parts by mass-curing accelerator (Curesol 2PZ-CN (trade name), 1-Cyanoethyl-2-phenylimidazole manufactured by Shikoku Kasei Kogyo Co., Ltd., "Curesol” is a registered trademark): 0.1 parts by mass
- the chip with the adhesive piece was pushed in from the base material layer side under the following measurement conditions, and the edge peeling strength of the chip with the adhesive piece was measured (see FIG. 2C).
- the surface of the base material layer corresponding to the central portion of the chip was marked with an oil-based pen.
- Examples 1 to 5 had better pick-up properties than Comparative Examples 1 to 4. Specifically, although Comparative Example 1 had a significantly lower value of 30 ° peel strength than Examples 1 to 4, the edge peeling strength was as high as 1.6 N, so that the pick-up property was significantly deteriorated. .. Further, in Comparative Example 2, although the 30 ° peel strength was 2.6 N / 25 mm and 3.0 N / 25 mm or less, it is considered that the pick-up property was deteriorated because the edge peel strength was relatively high at 1.3 N. ..
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Abstract
Description
(A)基材層と、基材層と対面する第1の面及びその反対側の第2の面を有する粘着剤層と、粘着剤層の第2の面の中央部を覆うように設けられた接着剤層とを備える評価対象のダイシング・ダイボンディング一体型フィルムを準備する工程
(B)温度23℃において剥離角度30°及び剥離速度60mm/分の条件で、接着剤層からの粘着剤層の剥離強度を測定する第1測定工程
(C)ダイシング・ダイボンディング一体型フィルムの接着剤層に対して厚さ50μmのシリコンウェハを貼るとともに、粘着剤層の第2の面に対してダイシングリングを貼る工程
(D)シリコンウェハ及び接着剤層を複数の接着剤片付きチップに個片化し、辺の長さが2mmの正方形の接着剤片付きチップを得る工程
(E)温度23℃において基材層側から接着剤片付きチップの中央部を速度60mm/分で押し込み、接着剤片付きチップのエッジが粘着剤層から剥離するときのエッジ剥離強度を測定する第2測定工程
(i)基材層と、基材層と対面する第1の面及びその反対側の第2の面を有する粘着剤層と、粘着剤層の第2の面の中央部を覆うように設けられた接着剤層とを備える評価対象のダイシング・ダイボンディング一体型フィルムを準備する工程
(ii)剥離角度30°の条件で接着剤層からの粘着剤層の剥離強度を測定する第1測定工程
(iii)ダイシング・ダイボンディング一体型フィルムの接着剤層に対して厚さ10~100μmのウェハを貼るとともに、粘着剤層の第2の面に対してダイシングリングを貼る工程
(iv)ウェハ及び接着剤層を、面積9mm2以下の接着剤片付きチップに個片化する工程
(v)基材層側から接着剤片付きチップの中央部を押し込み、接着剤片付きチップのエッジが粘着剤層から剥離するときのエッジ剥離強度を測定する第2測定工程
<エッジ剥離強度の測定>
・接着剤層に対して厚さ50μmのシリコンウェハを貼るとともに、粘着剤層の第2の面に対してダイシングリングを貼る工程
・シリコンウェハ及び接着剤層を複数の接着剤片付きチップに個片化し、辺の長さが2mmの正方形の接着剤片付きチップを得る工程
・温度23℃において基材層側から接着剤片付きチップの中央部を速度60mm/分で押し込み、接着剤片付きチップのエッジが粘着剤層から剥離するときのエッジ剥離強度を測定する工程
・接着剤層を比較的高粘度化(高弾性化)したり、薄膜化(例えば60μm以下)することによって、ブレードダイシング時の接着剤層の切削性を高める。
・粘着剤層の成分(例えば、架橋剤又は光重合開始剤)の量を変更することによって粘着剤層を比較的高弾性化したり、粘着力を調整する。
・基材層の破断伸度を小さくする。
・ブレードダイシング時に基材層まで切り込まないように粘着剤層を厚膜化(例えば30μm以上)する。
<エッジ剥離強度の測定>
・接着剤層に対して厚さ50μmのシリコンウェハを貼るとともに、粘着剤層の第2の面に対してダイシングリングを貼る工程
・シリコンウェハ及び接着剤層を複数の接着剤片付きチップに個片化し、辺の長さが2mmの正方形の接着剤片付きチップを得る工程
・温度23℃において基材層側から接着剤片付きチップの中央部を速度60mm/分で押し込み、接着剤片付きチップのエッジが粘着剤層から剥離するときのエッジ剥離強度を測定する工程
図1(a)は、本実施形態に係るダイシング・ダイボンディング一体型フィルムを示す平面図であり、図1(b)は、図1のB-B線に沿った模式断面図である。ダイシング・ダイボンディング一体型フィルム10(以下、場合により、単に「フィルム10」と言う。)は、ウェハWを面積9mm2以下の複数のチップに個片化するダイシング工程及びその後のピックアップ工程を含む半導体装置の製造プロセスに適用されるものである(図8(c)及び図8(d)参照)。
<エッジ剥離強度の測定>
・接着剤層5に対して厚さ50μmのシリコンウェハWsを貼るとともに、粘着剤層3の第2の面F2に対してダイシングリングDRを貼る工程(図2(a)参照)
・シリコンウェハWs及び接着剤層5を複数の接着剤片付きチップTa(以下、場合により単に「チップTa」と言う。)に個片化する工程(図2(b)参照)
・温度23℃において基材層1側からチップTaの中央部を速度60mm/分で押し込み(図2(c)参照)、チップTaのエッジが粘着剤層3から剥離するときのエッジ剥離強度を測定する工程
<ダイシング条件>
・ダイサー:DFD6361(株式会社ディスコ製)
・ブレード:ZH05-SD4000-N1-70-BB(株式会社ディスコ製)
・ブレード回転数:40000rpm
・ダイシング速度:30mm/秒
・ブレードハイト:90μm
・粘着剤層3の表面からの切り込み深さ:20μm
・チップTaの平面視での形状:2mm×2mmの正方形
<測定条件>
・測定装置:小型卓上試験機EZ-SX(株式会社島津製作所製)
・ロードセル:50N
・押し込み冶具:ZTSシリーズ付属アタッチメント(形状:円錐型、株式会社イマダ製)
・押し込み速度:60mm/分
・温度:23℃
・湿度:45±10%
基材層1としては、既知のポリマーシート又はフィルムを用いることができ、低温条件下においても、エキスパンド工程を実施可能なものであれば、特に制限はない。具体的には、基材層1を構成するポリマーとして、結晶性ポリプロピレン、非晶性ポリプロピレン、高密度ポリエチレン、中密度ポリエチレン、低密度ポリエチレン、超低密度ポリエチレン、低密度直鎖ポリエチレン、ポリブテン、ポリメチルペンテン等のポリオレフィン、エチレン-酢酸ビニル共重合体、アイオノマー樹脂、エチレン-(メタ)アクリル酸共重合体、エチレン-(メタ)アクリル酸エステル(ランダム、交互)共重合体、エチレン-ブテン共重合体、エチレン-ヘキセン共重合体、ポリウレタン、ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル、ポリカーボネート、ポリイミド、ポリエーテルエーテルケトン、ポリイミド、ポリエーテルイミド、ポリアミド、全芳香族ポリアミド、ポリフェニルスルフイド、アラミド(紙)、ガラス、ガラスクロス、フッ素樹脂、ポリ塩化ビニル、ポリ塩化ビニリデン、セルロース系樹脂、シリコーン樹脂、又は、これらに可塑剤を混合した混合物、あるいは、電子線照射により架橋を施した硬化物が挙げられる。
粘着剤層3は、接着剤層5におけるシリコンウェハWsの貼付け位置に対応する領域Rwを少なくとも含む第1の領域3aと、第1の領域3aを囲むように位置する第2の領域3bとを有する。図1(a)及び図1(b)における破線は第1の領域3aと第2の領域3bの境界を示す。第1の領域3a及び第2の領域3bは、活性エネルギー線の照射前において同一の組成物からなる。第1の領域3aは、紫外線等の活性エネルギー線が照射されることによって、第2の領域3bと比較して粘着力が低下した状態の領域である。第2の領域3bはダイシングリングDRが貼り付けられる領域である(図2(a)参照)。第2の領域3bは活性エネルギー線が照射されていない領域であり、ダイシングリングDRに対する高い粘着力を有する。
粘着剤組成物は、連鎖重合可能な官能基を有する(メタ)アクリル系樹脂を含み、官能基がアクリロイル基及びメタクリロイル基から選ばれる少なくとも1種であることが好ましい。活性エネルギー線照射前の粘着剤層における上記官能基の含有量は、例えば、0.1~1.2mmol/gであり、0.3~1.0mmol/g又は0.5~0.8mmol/gであってもよい。上記官能基の含有量が0.1mmol/g以上であることで、活性エネルギー線の照射によって粘着力が適度に低下した領域(第1の領域3a)を形成しやすく、他方、1.2mmol/g以下であることで、優れたピックアップ性を達成しやすい。
光重合開始剤としては、活性エネルギー線(紫外線、電子線及び可視光線から選ばれる少なくとも1種)を照射することで連鎖重合可能な活性種を発生するものであれば、特に制限はなく、例えば、光ラジカル重合開始剤が挙げられる。ここで連鎖重合可能な活性種とは、連鎖重合可能な官能基と反応することで重合反応が開始されるものを意味する。
架橋剤は、例えば、粘着剤層の弾性率及び/又は粘着性の制御を目的に用いられる。架橋剤は、上記(メタ)アクリル系樹脂が有する水酸基、グリシジル基及びアミノ基等から選ばれる少なくとも1種の官能基と反応し得る官能基を一分子中に2つ以上有する化合物であればよい。架橋剤と(メタ)アクリル系樹脂との反応によって形成される結合としては、エステル結合、エーテル結合、アミド結合、イミド結合、ウレタン結合、ウレア結合等が挙げられる。
接着剤層5には、既知のダイボンディングフィルムを構成する接着剤組成物を適用できる。具体的には、接着剤層5を構成する接着剤組成物は、エポキシ基含有アクリル共重合体、エポキシ樹脂及びエポキシ樹脂硬化剤を含有することが好ましい。これらの成分を含む接着剤層5によれば、チップ/基板間、チップ/チップ間の接着性に優れ、また電極埋め込み性及びワイヤ埋め込み性等も付与可能で、かつダイボンディング工程では低温で接着でき、短時間で優れた硬化が得られる、封止剤でモールド後は優れた信頼性を有する等の特徴があり好ましい。
フィルム10の製造方法は、基材層1の表面上に、活性エネルギー線が照射されることによって粘着力が低下する粘着剤組成物からなる粘着剤層と、粘着剤層の表面上に形成された接着剤層5とを含む積層体を作製する工程と、積層体に含まれる粘着剤層の第1の領域3aとなる領域に活性エネルギー線を照射する工程とをこの順序で含む。第1の領域3aとなる領域に対する活性エネルギー線の照射量は、例えば、10~1000mJ/cm2であり、100~700mJ/cm2又は200~500mJ/cm2であってもよい。
図7は本実施形態に係る半導体装置を模式的に示す断面図である。この図に示す半導体装置100は、基板70と、基板70の表面上に積層された四つのチップT1,T2,T3,T4と、基板70の表面上の電極(不図示)と四つのチップT1,T2,T3,T4とを電気的に接続するワイヤW1,W2,W3,W4と、これらを覆っている封止層50とを備える。
スリーワンモータ、撹拌翼、窒素導入管が備え付けられた容量2000mlのフラスコに以下の成分を入れた。
・酢酸エチル(溶剤):635g
・2-エチルヘキシルアクリレート:395g
・2-ヒドロキシエチルアクリレート:100g
・メタクリル酸:5g
・アゾビスイソブチロニトリル:0.08g
表1の製造例1に示す原料モノマー組成の代わりに、製造例2~4に示す原料モノマー組成としたことの他は、製造例1と同様にして製造例2~4に係る(A)アクリル樹脂の溶液をそれぞれ得た。製造例2~4に係る(A)アクリル樹脂についての測定結果を表1に示す。
[ダイシングフィルム(粘着剤層)の作製]
以下の成分を混合することで、粘着剤層形成用のワニスを調製した(表2参照)。酢酸エチル(溶剤)の量は、ワニスの総固形分含有量が25質量%となるように調整した。
・(A)アクリル樹脂溶液(製造例1):100g(固形分)
・(B)光重合開始剤(2-ヒドロキシ-1-{4-[4-(2-ヒドロキシ-2-メチル-プロピオニル)-ベンジル]-フェニル}-2-メチル-プロパン-1-オン(チバスペシャリティケミカルズ株式会社製、イルガキュア127、「イルガキュア」は登録商標):1.0g
・(C)架橋剤(多官能イソシアネート、日本ポリウレタン工業株式会社製、コロネートL、固形分:75%):8.0g(固形分)
・酢酸エチル(溶剤)
まず、以下の組成物にシクロヘキサノン(溶剤)を加えて攪拌混合した後、更にビーズミルを用いて90分混練した。
・エポキシ樹脂(YDCN-700-10(商品名)、新日鉄住金化学株式会社製クレゾールノボラック型エポキシ樹脂、エポキシ当量210、分子量1200、軟化点80℃):14質量部
・フェノール樹脂(ミレックスXLC-LL(商品名)、三井化学株式会社製、フェノール樹脂、水酸基当量175、吸水率1.8%、350℃における加熱重量減少率4%):23質量部
・シランカップリング剤(NUC A-189(商品名)株式会社NUC製、γ-メルカプトプロピルトリメトキシシラン):0.2質量部
・シランカップリング剤(NUCA-1160(商品名)、日本ユニカー株式会社製、γ-ウレイドプロピルトリエトキシシラン):0.1質量部
・フィラー(「SC2050-HLG(商品名)、アドマテックス株式会社製、シリカ、平均粒径0.500μm):32質量部
・エポキシ基含有アクリル共重合体(HTR-860P-3(商品名)、ナガセケムテックス株式会社製、重量平均分子量80万):16質量部
・硬化促進剤(キュアゾール2PZ-CN(商品名)、四国化成工業株式会社製、1-シアノエチル-2-フェニルイミダゾール、「キュアゾール」は登録商標)0.0.1質量部
接着剤層とキャリアフィルムとからなるダイボンディングフィルムを、キャリアフィルムごと直径335mmの円形にカットした。これにポリエチレンテレフタレートフィルムを剥離したダイシングフィルムを室温で貼り付け後、室温で1日放置した。その後、直径370mmの円形にダイシングフィルムをカットした。このようにして得たダイシング・ダイボンディング一体型フィルムの接着剤層におけるウェハの貼付け位置に対応する領域(粘着剤層の第1の領域)に以下のようにして紫外線を照射した。すなわち、パルスドキセノンランプを用いて70W、300mJ/cm2の照射量で部分的に紫外線を照射した。なお、暗幕を用いてフィルムの中心から内径318mmの部分に紫外線を照射した。このようにして、後述の種々の評価試験に供するための複数のダイシング・ダイボンディング一体型フィルムを得た。
ダイシングフィルムを作製する際、「イルガキュア127」の代わりに、1-ヒドロキシ-シクロヘキシル-フェニル-ケトン、チバスペシャリティケミカルズ株式会社製、イルガキュア184、「イルガキュア」は登録商標)を使用したこと、及び、紫外線の照射量を300mJ/cm2とする代わりに、200mJ/cm2としたことの他は、実施例1と同様にして、複数のダイシング・ダイボンディング一体型フィルムを得た。
<実施例3>
紫外線の照射量を200mJ/cm2とする代わりに、250mJ/cm2としたことの他は実施例2と同様にして、複数のダイシング・ダイボンディング一体型フィルムを得た。
紫外線の照射量を200mJ/cm2とする代わりに、300mJ/cm2としたことの他は実施例2と同様にして、複数のダイシング・ダイボンディング一体型フィルムを得た。
ダイボンディングフィルムとして、接着剤層Aを有するものの代わりに、以下のようにして形成した接着剤層Bを有するものを使用したことの他は実施例4と同様にして、複数のダイシング・ダイボンディング一体型フィルムを得た。
[ダイボンディングフィルム(接着剤層B)の作製]
まず、以下の成分にシクロヘキサノン(溶剤)を加えて攪拌混合した後、更にビーズミルを用いて90分混練した。
・フィラー(「SC2050-HLG(商品名)、アドマテックス株式会社製、シリカ、平均粒径0.500μm):50質量部
上記のようにして得た組成物に以下の成分を加えた後、攪拌混合及び真空脱気の工程を経て接着剤層形成用のワニスを得た。
・エポキシ基含有アクリル共重合体(HTR-860P-3(商品名)、ナガセケムテックス株式会社製、重量平均分子量80万):100質量部
・硬化促進剤(キュアゾール2PZ-CN(商品名)、四国化成工業株式会社製、1-シアノエチル-2-フェニルイミダゾール、「キュアゾール」は登録商標):0.1質量部
ダイシングフィルムを作製する際、製造例1に係るアクリル樹脂を使用する代わりに製造例2に係るアクリル樹脂を使用したこと、及び、架橋剤の量を8.0質量部とする代わりに6.0質量部としたことの他は実施例1と同様にして、複数のダイシング・ダイボンディング一体型フィルムを得た。
ダイシングフィルムを作製する際、架橋剤の量を8.0質量部とする代わりに6.0質量部としたことの他は実施例1と同様にして、複数のダイシング・ダイボンディング一体型フィルムを得た。
ダイシングフィルムを作製する際、製造例2に係るアクリル樹脂を使用する代わりに製造例3に係るアクリル樹脂を使用したことの他は比較例1と同様にして、複数のダイシング・ダイボンディング一体型フィルムを得た。
ダイシングフィルムを作製する際、製造例2に係るアクリル樹脂を使用する代わりに製造例4に係るアクリル樹脂を使用したこと、及び、紫外線を照射しなかったことの他は比較例1と同様にして、複数のダイシング・ダイボンディング一体型フィルムを得た。
(1)接着剤層に対する粘着剤層の粘着力(30°ピール強度)の測定
接着剤層に対する粘着剤層の粘着力を30°ピール強度を測定することによって評価した。すなわち、ダイシング・ダイボンディング一体型フィルムから幅25mm及び長さ100mmの測定試料を切り出した。測定試料は、粘着剤層と、接着剤層の積層体とした。引張試験機を用いて接着剤層に対する粘着剤層のピール強度を測定した。測定条件は、剥離角度30°、引張速度60mm/分とした。なお、試料の保存及びピール強度の測定は、温度23℃、相対湿度40%の環境下で行った。実施例1~5及び比較例1~3については、粘着剤層における紫外線照射領域の粘着力を評価対象とし、比較例4については粘着剤層の粘着力を評価対象とした。
シリコンウェハ(直径:12インチ、厚さ:50μm)及びダイシングリングにダイシング・ダイボンディング一体型フィルムを以下条件で貼り付けた。シリコンウェハ及びダイシングリングを貼り付けた後のダイシング・ダイボンディング一体型フィルムのMD方向の伸びは、1.0~1.3%程度であった。
<貼付条件>
・貼付装置:DFM2800(株式会社ディスコ製)
・貼付温度:70℃
・貼付速度:10mm/s
・貼付テンションレベル:レベル6
<ダイシング条件>
・ダイサー:DFD6361(株式会社ディスコ製)
・ブレード:ZH05-SD4000-N1-70-BB(株式会社ディスコ製)
・ブレード回転数:40000rpm
・ダイシング速度:30mm/秒
・ブレードハイト:90μm
・粘着剤層の表面からの切り込み深さ:20μm
・ダイシング時の水量
ブレードクーラー:1.5L/分
シャワー:1.0L/分
スプレー:1.0L/分
<測定条件>
・測定装置:小型卓上試験機EZ-SX(株式会社島津製作所製)
・ロードセル:50N
・押し込み冶具:ZTSシリーズ付属アタッチメント(形状:円錐型、株式会社イマダ製)
・押し込み速度:60mm/分
・温度:23℃
・湿度:45±10%
以下の評価基準によりダイシング性を評価した。表2,3に結果を示す。
<チップ飛び>
ダイシング後にチップ飛びが全く発生しなかったものを「A」、チップ飛びには至らなかったが、接着剤層と粘着剤層との間に切削水の浸入がわずかにでも認められたものを「B」、チップ飛びが一回でも発生したものを「C」とした。
<クラック>
ダイシング後のチップの切削断面を顕微鏡にて確認し、チップの欠けが生じているか否かを評価した。10個のチップの切削断面を観察し、まったく欠けが認められなかった試料を「A」と評価し、わずかでも欠けが認められる試料を「B」と評価した。
上記のエッジ剥離強度の測定後、以下の条件で100個の接着剤片付きチップをピックアップした。
<ピックアップ条件>
・ダイボンダ装置:DB800-HSD(株式会社日立ハイテクノロジーズ製)
・突上げピン:EJECTOR NEEDLE SEN2-83-05(直径:0.7mm、先端形状:半径350μmの半球、マイクロメカニクス社製)
・突き上げ高さ:150μm
・突き上げ速度:1mm/秒、
なお、突上げピンは、チップの中央部に1本配置した。ピックアップの成功率が100%であったものを「A」、80%以上100%未満であったものを「B」、60%以上80%未満であったものを「C」、60%未満であったものを「D」とした。表2,3に結果を示す。
Claims (8)
- (A)基材層と、前記基材層と対面する第1の面及びその反対側の第2の面を有する粘着剤層と、前記粘着剤層の前記第2の面の中央部を覆うように設けられた接着剤層とを備える評価対象のダイシング・ダイボンディング一体型フィルムを準備する工程と、
(B)温度23℃において剥離角度30°及び剥離速度60mm/分の条件で、前記接着剤層からの前記粘着剤層の剥離強度を測定する第1測定工程と、
(C)前記ダイシング・ダイボンディング一体型フィルムの前記接着剤層に対して厚さ50μmのシリコンウェハを貼るとともに、前記粘着剤層の前記第2の面に対してダイシングリングを貼る工程と、
(D)前記シリコンウェハ及び前記接着剤層を複数の接着剤片付きチップに個片化し、辺の長さが2mmの正方形の前記接着剤片付きチップを得る工程と、
(E)温度23℃において前記基材層側から前記接着剤片付きチップの中央部を速度60mm/分で押し込み、前記接着剤片付きチップのエッジが前記粘着剤層から剥離するときのエッジ剥離強度を測定する第2測定工程と、
を含み、
前記第1測定工程で測定される前記剥離強度が3.0N/25mm以下であり且つ前記第2測定工程で測定される前記エッジ剥離強度が1.2N以下であるとき、前記ダイシング・ダイボンディング一体型フィルムは良好なピックアップ性を有すると判定する、ダイシング・ダイボンディング一体型フィルムの評価方法。 - (i)基材層と、前記基材層と対面する第1の面及びその反対側の第2の面を有する粘着剤層と、前記粘着剤層の前記第2の面の中央部を覆うように設けられた接着剤層とを備える評価対象のダイシング・ダイボンディング一体型フィルムを準備する工程と、
(ii)剥離角度30°の条件で前記接着剤層からの前記粘着剤層の剥離強度を測定する第1測定工程と、
(iii)前記ダイシング・ダイボンディング一体型フィルムの前記接着剤層に対して厚さ10~100μmのウェハを貼るとともに、前記粘着剤層の前記第2の面に対してダイシングリングを貼る工程と、
(iv)前記ウェハ及び前記接着剤層を、面積9mm2以下の接着剤片付きチップに個片化する工程と、
(v)前記基材層側から前記接着剤片付きチップの中央部を押し込み、前記接着剤片付きチップのエッジが前記粘着剤層から剥離するときのエッジ剥離強度を測定する第2測定工程と、
を含む、ピックアップ性の評価方法。 - 基材層と、
前記基材層と対面する第1の面及びその反対側の第2の面を有する粘着剤層と、
前記粘着剤層の前記第2の面の中央部を覆うように設けられた接着剤層と、
を備え、
温度23℃において剥離角度30°及び剥離速度60mm/分の条件で測定される、前記接着剤層からの前記粘着剤層の剥離強度が3.0N/25mm以下であり且つ以下の工程を経て測定されるエッジ剥離強度が1.2N以下である、ダイシング・ダイボンディング一体型フィルム。
<エッジ剥離強度の測定>
・前記接着剤層に対して厚さ50μmのシリコンウェハを貼るとともに、前記粘着剤層の前記第2の面に対してダイシングリングを貼る工程
・前記シリコンウェハ及び前記接着剤層を複数の接着剤片付きチップに個片化し、辺の長さが2mmの正方形の前記接着剤片付きチップを得る工程
・温度23℃において前記基材層側から前記接着剤片付きチップの中央部を速度60mm/分で押し込み、前記接着剤片付きチップのエッジが前記粘着剤層から剥離するときのエッジ剥離強度を測定する工程 - 面積9mm2以下の複数の接着剤片付きチップにウェハ及び接着剤層を個片化する工程を含む半導体装置製造プロセスに適用される、請求項3に記載のダイシング・ダイボンディング一体型フィルム。
- 前記個片化する工程において、ブレードダイシングによって前記複数の接着剤片付きチップが得られる、請求項4に記載のダイシング・ダイボンディング一体型フィルム。
- 請求項3~5のいずれか一項に記載のダイシング・ダイボンディング一体型フィルムを準備する工程と、
前記ダイシング・ダイボンディング一体型フィルムの前記接着剤層に対してウェハを貼るとともに、前記粘着剤層の前記第2の面に対してダイシングリングを貼る工程と、
前記ウェハ及び前記接着剤層を面積9mm2以下の複数の接着剤片付きチップに個片化する工程と、
前記接着剤片付きチップを前記粘着剤層からピックアップする工程と、
前記接着剤片付きチップを、基板又は他のチップ上にマウントする工程と、
を含む、半導体装置の製造方法。 - 基材層と、前記基材層と対面する第1の面及びその反対側の第2の面を有する粘着剤層と、前記粘着剤層の前記第2の面の中央部を覆うように設けられた接着剤層とをそれぞれ備える二種以上のダイシング・ダイボンディング一体型フィルムを準備する工程と、
前記二種以上のダイシング・ダイボンディング一体型フィルムの前記接着剤層からの前記粘着剤層の剥離強度、及びエッジ剥離強度を比較する工程と、
を含む、ダイシング・ダイボンディング一体型フィルムの選別方法。 - 基材層と、前記基材層と対面する第1の面及びその反対側の第2の面を有する粘着剤層と、前記粘着剤層の前記第2の面の中央部を覆うように設けられた接着剤層とをそれぞれ備え、温度23℃において剥離角度30°及び剥離速度60mm/分の条件で測定される、前記接着剤層からの前記粘着剤層の剥離強度が3.0N/25mm以下である、複数のダイシング・ダイボンディング一体型フィルムを準備する工程と、
前記複数のダイシング・ダイボンディング一体型フィルムについて、以下の工程を経て測定されるエッジ剥離強度が1.2N以下であるか否かを検査する工程と、
を含むダイシング・ダイボンディング一体型フィルムの選別方法。
<エッジ剥離強度の測定>
・前記接着剤層に対して厚さ50μmのシリコンウェハを貼るとともに、前記粘着剤層の前記第2の面に対してダイシングリングを貼る工程
・前記シリコンウェハ及び前記接着剤層を複数の接着剤片付きチップに個片化し、辺の長さが2mmの正方形の前記接着剤片付きチップを得る工程
・温度23℃において前記基材層側から前記接着剤片付きチップの中央部を速度60mm/分で押し込み、前記接着剤片付きチップのエッジが前記粘着剤層から剥離するときのエッジ剥離強度を測定する工程
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JP6835296B1 (ja) | 2021-02-24 |
CN113348533B (zh) | 2022-06-03 |
SG11202112361PA (en) | 2021-12-30 |
CN113348533A (zh) | 2021-09-03 |
JPWO2020230211A1 (ja) | 2021-06-03 |
KR20210111867A (ko) | 2021-09-13 |
KR102412771B1 (ko) | 2022-06-27 |
TW202104870A (zh) | 2021-02-01 |
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