WO2004109786A1 - 接着シート、ダイシングテープ一体型接着シート、及び半導体装置の製造方法 - Google Patents
接着シート、ダイシングテープ一体型接着シート、及び半導体装置の製造方法 Download PDFInfo
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- WO2004109786A1 WO2004109786A1 PCT/JP2004/008150 JP2004008150W WO2004109786A1 WO 2004109786 A1 WO2004109786 A1 WO 2004109786A1 JP 2004008150 W JP2004008150 W JP 2004008150W WO 2004109786 A1 WO2004109786 A1 WO 2004109786A1
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- adhesive sheet
- wafer
- dicing tape
- molecular weight
- semiconductor
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- Y10T428/31587—Hydrocarbon polymer [polyethylene, polybutadiene, etc.]
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Definitions
- the present invention relates to an adhesive sheet, a dicing tape-integrated adhesive sheet, and a method for manufacturing a semiconductor device, which are suitable for joining a semiconductor element and a semiconductor element mounting support member.
- silver paste has been mainly used for joining a semiconductor element and a supporting member for mounting the semiconductor element.
- the supporting members used have also been required to be miniaturized and fine.
- silver paste suffered from problems such as the occurrence of defects during wire bonding due to protrusion and inclination of semiconductor elements, difficulty in controlling the thickness of the adhesive sheet, and the generation of voids in the adhesive sheet. It is becoming increasingly difficult to handle demand. Therefore, in order to meet the above demand, a sheet-like adhesive has recently been used.
- This adhesive sheet is used in an individual piece bonding method or a wafer backside bonding method.
- a reel-shaped adhesive sheet is cut into individual pieces by cutting or punching, and then the individual pieces are adhered to a support member to attach the adhesive sheet.
- Dicing process to support member A semiconductor device is obtained by joining the singulated semiconductor elements to form a support member with a semiconductor element; and thereafter, if necessary, through a wire pond process, a sealing process, and the like.
- a special assembly device for cutting out the adhesive sheet and adhering it to the supporting member is required, so that the manufacturing cost is lower than the method using silver paste.
- the adhesive sheet is attached to the backside of the semiconductor wafer, and then a dicing tape is attached to the other surface of the adhesive sheet;
- the semiconductor device is obtained by dicing the semiconductor device into individual pieces by dicing; picking up the individualized semiconductor elements with an adhesive sheet and bonding them to a support member; and performing a subsequent process such as heating, curing, and wire pond to obtain a semiconductor device. Will be done.
- the adhesive sheet of the wafer backside bonding method does not require a device for dividing the adhesive sheet into individual pieces because the semiconductor element with the adhesive sheet is bonded to the support member.
- An object of the present invention is to provide an adhesive sheet that can be attached to a wafer at a low temperature, is flexible enough to be handled at room temperature, and can be cut at the same time as a wafer under ordinary cutting conditions.
- the present inventors have specified the breaking strength and breaking elongation of the adhesive sheet in the B-stage state at 25 t: within a specific numerical range, thereby providing an adhesive sheet that can be cut at the same time as wafer cutting at room temperature. I found that I could get it.
- the present inventors require that the adhesive sheet maintain flexibility at room temperature and that the adhesive sheet be cut at the same time when cutting at room temperature. It was found that it was necessary to have Here, the frequency dependence is a phenomenon in which the elastic modulus varies depending on the frequency of the strain applied to the sample in the measurement of the dynamic viscoelastic modulus.
- the present invention features the following items ⁇ 1> to ⁇ 15>.
- An adhesive sheet containing at least a high molecular weight component, wherein B An adhesive sheet characterized in that the adhesive sheet in a stage state has a breaking strength at 25 ° C of from 0.1 MPa to 10 MPa and an elongation at break of from 1% to 40%.
- ⁇ 6> The high molecular weight component according to any one of ⁇ 1> to ⁇ 5>, wherein the glass transition temperature is 130 to 50 ° C, and the weight average molecular weight is 50,000 to 1,000,000. 3.
- the adhesive sheet according to 1. ⁇ 7> The high molecular weight component having a glass transition temperature of 30 ° C. to 50 ° C. and a weight average molecular weight of 50,000 to 1,000,000 is converted into a weight obtained by subtracting the filler weight from the total weight of the adhesive sheet.
- the adhesive sheet described in 6> above characterized in that it is contained in an amount of 50% by weight or less.
- a dicing tape integrated adhesive sheet wherein the adhesive sheet according to any one of ⁇ 1> to ⁇ 11> above and a dicing tape are laminated.
- ⁇ 1 3> I) a step of attaching the adhesive sheet described in any one of the above ⁇ 1> to ⁇ 11> to a semiconductor wafer; II) a step of allowing the semiconductor wafer to be cut; and III) a step of attaching the adhesive sheet. Attaching a dicing tape in the order of 1-11-111, II-I-III or I-III-II, and IV) by cutting the semiconductor wafer and the adhesive sheet. A step of obtaining a plurality of individualized semiconductor chips with an adhesive sheet; and V) a step of bonding the semiconductor chip with an adhesive sheet to a support member for mounting a semiconductor chip. Production method.
- ⁇ 15> The method for manufacturing a semiconductor device according to ⁇ 13> or ⁇ 14>, wherein the method for cutting the semiconductor wafer is half-cut dicing or stealth dicing.
- FIG. 1 is a conceptual diagram showing one embodiment of the step I) in the present invention.
- FIG. 2 is a conceptual diagram showing one embodiment of step (i) in the present invention.
- FIG. 3 is a conceptual diagram showing one embodiment of the step III) in the present invention.
- FIG. 4 is a conceptual diagram showing one embodiment of the step IV) in the present invention.
- FIG. 5 is a conceptual diagram showing one embodiment of step V) in the present invention.
- FIG. 6 is a conceptual diagram showing one embodiment of the step I ′) in the present invention.
- FIG. 7 is a conceptual diagram showing one embodiment of the step II) in the present invention.
- FIG. 8 is a conceptual diagram showing a state where an external force is applied to the wafer of FIG. 7 to cut the wafer and the adhesive sheet.
- FIG. 9 is a conceptual diagram showing one embodiment of the step V) in the present invention.
- FIG. 10 is a conceptual diagram showing one embodiment of a semiconductor chip with an adhesive sheet.
- FIG. 11 is a conceptual diagram showing one embodiment of the steps I-1), II) and IV) in the present invention. Best mode for carrying out the invention.
- the adhesive sheet of the present invention comprises at least a high molecular weight component and is in a B-stage state.
- the adhesive sheet has a breaking strength at 25 ° C of 0.1 MPa or more and 1 OMPa or less, and a breaking elongation. Is 1% or more and 40% or less.
- the breaking strength is less than 0. IMPa, the adhesive sheet is brittle and the handleability is reduced. On the other hand, if it exceeds 10 MPa, the adhesive sheet cannot be cut at the same time when the wafer is cut, which is inappropriate. Similarly, when the elongation at break is less than 1%, the adhesive sheet is brittle and the handleability is reduced. If the elongation at break exceeds 40%, the adhesive sheet cannot be cut at the same time when the wafer is cut, which is inappropriate. It is preferable that the breaking strength is 1 to 8 MPa and the breaking elongation is 5 to 35% from the viewpoint that the adhesive sheet can be reliably broken when the wafer breaks and that it has sufficient strength and is excellent in handleability. More preferably, the strength is 3 to 7 MPa and the elongation at break is 10 to 30%.
- Breaking strength (Pa) Maximum strength (N) Sample cross-sectional area (m 2 )
- Elongation at break (%) (Sample length at break (mm)-20) / 20 X 100
- oligomers and monomers having a low Tg and a high molecular weight component and a softening point of less than 30 ° C are effective. It is effective to increase the amount of addition.
- it is effective to increase the amount of oligomers and monomers having a softening point of 30 ° C or higher, the amount of high Tg high molecular weight components, and to reduce the toughness by adding fillers. is there.
- the adhesive sheet of the present invention contains at least a high molecular weight component, and the adhesive sheet in the B-stage state has an elastic modulus of 1 to 3000 MPa by dynamic viscoelasticity measurement at 25 ° C and 10 Hz, It is characterized in that the elastic modulus by dynamic viscoelasticity measurement at 900 Hz at 25 ° C is 400 to 2000 MPa.
- the elastic modulus at 25 Hz and 10 Hz is preferably from 100 to 150 MPa, and preferably from 100 to 120 OMPa. More preferred. If the elastic modulus is less than IMP a, the adhesive sheet will have a large elongation and will be difficult to handle. Exceeding 300 OMPa is not preferable because cracks occur in the adhesive sheet during handling. Further, the elastic modulus at 25 ° C. and 900 Hz is preferably 5000 to 15000 MPa. If the elastic modulus is less than 400 OMPa, cutting tends to be difficult, and if it exceeds 20000 MPa, cracks tend to occur during handling.
- the adhesive sheet of the present invention contains at least a high molecular weight component, and the elastic modulus of the adhesive sheet in the B-stage state by dynamic viscoelasticity measurement at 10 Hz at 25 ° C. is 1 to 3 It is characterized by a dynamic modulus of 400 MPa to 2000 OMPa at 100 ° C. at 100 ° C. at 100 ° C.
- the elastic modulus at 10 Hz at ⁇ 20 ° C. is preferably 5000 to 15000 MPa. If the elastic modulus is less than 4000 MPa, cutting tends to be difficult, and if it exceeds 2000 OMPa, cracks tend to occur during handling.
- the adhesive sheet according to the present invention may be in the range of the various characteristic values defined above when it is cut after being attached to the wafer, and may not be in this range when it is attached. In other words, any material that falls within the above-mentioned various characteristic values after a certain storage period after being attached to the wafer or after processing by irradiation with radiation such as heat treatment or photo-curing may be used. If an adhesive sheet with large breaking strength and breaking elongation is used before being attached to the body, the adhesive sheet can be attached to the semiconductor wafer at a low temperature. By setting the elongation at break within the above numerical range, the breakability can be improved.
- the adhesive sheet has strong tackiness when attached to the wafer and has room temperature. Then, laminating can be easily performed, and thereafter, by setting the elastic modulus within the above numerical range, the breakability can be improved.
- the adhesive sheet of the present invention When the adhesive sheet of the present invention is used, it is preferable to laminate the wafer at a temperature of 40 to 100 ° C. in order to reduce the warpage of the wafer and improve the handleability at room temperature. Therefore, the adhesive sheet of the present invention has an elastic modulus of 0.1 to 20 MPa according to a dynamic viscosity measurement at 60 ° C. and 10 Hz at 60 ° C. of the adhesive sheet in the B-stage state.
- the pressure is more preferably 0.1 to 10 MPa, and particularly preferably 0.1 to 5 MPa. If it is less than 0. IMPa, the sheet may peel off or slip off from the wafer after application, which is not preferable.
- the adhesive sheet of the present invention preferably has, in addition to the above properties, heat resistance and moisture resistance required when a semiconductor element is mounted on a support member for mounting a semiconductor element.
- the adhesive sheet of the present invention is not particularly limited as long as it satisfies the above-mentioned properties. However, since the adhesive sheet has an appropriate backing strength and is easy to handle in a sheet form, the adhesive sheet has a high molecular weight. It is preferable to include a thermosetting component and a filler in addition to the amount component, and may further include a curing accelerator, a catalyst, an additive, a coupling agent, and the like in addition to these components.
- breaking strength and breaking elongation tend to increase as the amount of the high molecular weight component contained in the adhesive sheet increases and the amount of the filler decreases, so that these components have the breaking strength and breaking elongation specified in the present invention. It is important to make adjustments within the specified numerical range.
- the high molecular weight component in the present invention is not particularly limited as long as it satisfies the properties of the adhesive sheet.
- (Tg) is -30 ° (: It is preferable that the weight average molecular weight is 50,000 to 100,000 at ⁇ 50 ° C. If Tg exceeds 50 ° C, it is disadvantageous in that the flexibility of the sheet is low. If the Tg is less than -30 ° C, the sheet is too flexible, which is inconvenient in that the sheet does not easily break when the wafer breaks, and the weight-average molecular weight is less than 50,000, This is inconvenient in that the heat resistance is reduced, and when the molecular weight exceeds 1,000,000, the fluidity of the sheet is reduced.
- a high molecular weight component having a ⁇ g of ⁇ 20 ° (: a weight average molecular weight of 100,000 to 900,000 at up to 40 ° C. is more preferable, however, a high molecular weight component having a weight average molecular weight of 50,000 to 1,000,000 at 50 ° C is preferred, and a weight average molecular weight of 500,000 to 90 at Tg of -10 to 30 ° C.
- the weight-average molecular weight is a value converted to polystyrene using a calibration curve based on standard polystyrene by gel permeation chromatography (GPC), and Hitachi pump L_6000 is used.
- the high molecular weight component examples include polyimide, polystyrene, polyethylene, polyester, polyamide, butadiene rubber, acrylic rubber, (meth) acrylic resin, urethane resin, polyphenylene ether resin, polyetherimide resin, and phenoxy resin.
- Resin, modified polyphenylene Examples include a lenether resin, a phenoxy resin, a polycarbonate, and a mixture thereof.
- a high molecular weight component containing a functional monomer and having a weight average molecular weight of 100,000 or more for example, a functional monomer such as glycidyl acrylate or glycidyl methacrylate, and having a weight average molecular weight of 100,000 or more
- a functional monomer such as glycidyl acrylate or glycidyl methacrylate
- an epoxy group-containing (meth) acrylic copolymers are preferred.
- the epoxy group-containing (meth) acrylic copolymer for example, a (meth) acrylic ester copolymer, acrylic rubber and the like can be used, and acrylic rubber is more preferable.
- the acryl rubber is a rubber having an acrylic ester as a main component and mainly comprising a copolymer such as butyl acrylate and acrylonitrile, or a copolymer such as ethyl acrylate and acrylonitrile.
- the high molecular weight component is preferably contained in an amount of 50% by weight or less, more preferably 35% by weight or less, and more preferably 25% by weight or less, based on the total weight of the adhesive sheet excluding the weight of the filler. % Or more and not more than 35% by weight. If the blending amount of the high molecular weight component is large, the breakability of the adhesive sheet tends to deteriorate, and if the blending amount is too small, the fluidity at the time of bonding is too large, and thus a void tends to be generated.
- thermosetting component examples include an epoxy resin, a cyanate resin, a phenol resin, and a curing agent thereof, and an epoxy resin is preferable because of its high heat resistance.
- the epoxy resin is not particularly limited as long as it is cured and has an adhesive action.
- Bifunctional epoxy resins such as bisphenol A-type epoxy, and nopolak epoxy resins such as phenol nopolak epoxy resin and cresol nopolak epoxy resin can be used.
- polyfunctional epoxy resin, glycidylamine type epoxy resin, heterocyclic epoxy resin or alicyclic epoxy resin For example, commonly known ones can be applied.
- the adhesive sheet of the present invention includes a B-stage adhesive sheet having a reduced breaking strength, reduced elongation at break, improved adhesive handleability, improved thermal conductivity, adjusted melt viscosity, and improved thixotropic properties. It is preferable to add a filler, preferably an inorganic filler, for the purpose of imparting.
- Inorganic fillers include aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium magnesium oxide, calcium oxide, magnesium oxide, alumina, aluminum nitride, aluminum borate whisker, boron nitride, and crystals. Silica, amorphous silica, antimony oxide and the like. In order to improve the thermal conductivity, alumina, aluminum nitride, boron nitride, crystalline silica, amorphous silicon, and the like are preferable.
- Aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium gateate, magnesium gayate, calcium oxide, magnesium oxide, alumina, crystalline silica were used for the purpose of adjusting the melt viscosity and adding thixotropic properties. And amorphous silica are preferred. In order to improve moisture resistance, alumina, silica, aluminum hydroxide, and antimony oxide are preferable.
- the amount of the filler is preferably 5% by weight or more and 70% by weight or less, more preferably 35% by weight or more and 60% by weight or less based on the total weight of the adhesive sheet. If the amount is too large, problems such as an increase in the storage elastic modulus of the adhesive sheet, a decrease in adhesiveness, and a decrease in electrical properties due to residual voids are likely to occur. Therefore, the content is particularly preferably 50% by weight or less.
- the specific gravity of the filler is preferably 1 to 10 g / cm 3 .
- the adhesive sheet of the present invention has a UV curable property by containing an acrylic monomer having at least one unsaturated double bond in a molecule and a photoinitiator thereof. After laminating at a low temperature, UV irradiation reduces breaking elongation, thereby improving breakability.
- the adhesive sheet of the present invention is prepared by mixing and kneading the high molecular weight component, and further, if necessary, a thermosetting component, a filler, and other components in an organic solvent to prepare a varnish, and then forming the varnish on a base film. After forming a varnish layer and drying by heating, the substrate can be removed.
- the above-mentioned mixing and kneading can be carried out by appropriately combining ordinary dispersing machines such as a stirrer, a grinder, a three-roll mill and a pole mill.
- the heating and drying conditions are not particularly limited as long as the solvent used is sufficiently volatilized. Usually, the heating and drying are performed at 60 to 200 ° C. for 0.1 to 90 minutes. .
- the organic solvent used for preparing the varnish in the production of the adhesive sheet is not particularly limited as long as the material can be uniformly dissolved, kneaded or dispersed, and a conventionally known organic solvent can be used.
- a conventionally known organic solvent examples include ketone solvents such as dimethylformamide, dimethylacetamide, N-methylpyrrolidone, acetone, methylethylketone and cyclohexanone, toluene, xylene and the like. It is preferable to use methyl ethyl ketone, cyclohexanone, or the like because the drying speed is high and the price is low.
- the amount of the organic solvent used is not particularly limited as long as the residual volatile matter after the production of the adhesive sheet is 0.01 to 3% by weight based on the total weight. It is preferably from 0.1 to 2.0% by weight, more preferably from 0.01 to 1.5% by weight based on the total weight.
- a plurality of adhesive sheets of the present invention may be laminated to form a multilayer adhesive sheet as long as the adhesive sheet can be cut.
- the adhesive sheet of the present invention may be formed by combining a film made of a thermoplastic film, an adhesive, a thermosetting resin, or the like, and superposing an adhesive sheet on both sides of the film.
- the range in which the adhesive sheet can be cut means that the breaking strength, the breaking elongation and the elastic modulus of the multilayer adhesive sheet are within the above numerical ranges.
- examples of such a film include films made of thermoplastic resins such as polyimide and polyester, epoxy resins, silicone resins, and mixtures thereof. These films may contain various fillers.
- the thickness of the adhesive sheet of the present invention is not particularly limited, but is preferably 1 to 250 m. If the thickness is less than 1 m, the stress relaxation effect and adhesiveness tend to be poor.If the thickness is more than 250 m, it is not economical, and furthermore, the demand for miniaturization of semiconductor devices cannot be met and breakage becomes difficult. Tend. The thickness is preferably from 3 to 100 m, more preferably from 5 to 55 m, from the viewpoint of high adhesiveness and reduction in thickness of the semiconductor device.
- the dicing tape-integrated adhesive sheet of the present invention can be obtained by laminating the adhesive sheet of the present invention on a known dicing tape.
- the use of the dicing tape-integrated adhesive sheet requires only one laminating step on the wafer, which can increase the efficiency of work.
- a method of laminating the adhesive sheet on the dicing tape in addition to printing, a method of pressing an adhesive sheet prepared in advance on the dicing tape and a hot roll laminating method can be cited.However, it can be manufactured continuously and is efficient. The hot laminating method is preferred.
- Examples of the dicing tape used in the present invention include polytetrafluoroethylene film, polyethylene terephthalate film, polyethylene film, polypropylene film, and polymethylpentene. And plastic films such as polyimide films. If necessary, a surface treatment such as primer application, UV treatment, corona discharge treatment, polishing treatment, etching treatment, etc. may be performed.
- the dicing tape needs to have adhesiveness, and an adhesive layer may be provided on one surface of the dicing tape. This can be formed by applying and drying a resin composition having an appropriate tack strength obtained by adjusting the ratio of the liquid component and the Tg of the high molecular weight component in the resin composition of the pressure-sensitive adhesive layer. .
- the thickness of the dicing tape is not particularly limited, and is appropriately determined based on the knowledge of a person skilled in the art according to the thickness of the adhesive sheet and the use of the dicing tape-integrated adhesive sheet.
- the thickness is preferably from 60 to 150 m, and more preferably from 70 to 130 PLm, in terms of good film handling.
- the adhesive sheet of the present invention or the adhesive sheet with a dicing tape integrated adhesive sheet has an adhesive force such that semiconductor elements do not scatter during dicing when manufacturing a semiconductor device, and can be peeled off from the dicing tape during pick-up thereafter.
- the 90 ° peel strength of the adhesive sheet of the present invention and the dicing tape in the B-stage state is preferably 15 ON nm or less, more preferably 5 to 10 ON Zm, and 5 to 10 ON Zm. More preferably, it is 550 N / m.
- peel strength exceeds 150 NZm, the chip tends to break easily during pick-up.
- the peel strength was measured by dicing the adhesive sheet in an atmosphere of 25 ° C at an angle of 90 and a pulling speed of 5 Omm / min. The result when peeled off from the tape.
- the tack strength of the adhesive sheet In order to make the 90 ° peel strength equal to or less than 150 NZm, it is desirable to appropriately adjust the tack strength of the adhesive sheet.
- increasing the fluidity of the adhesive sheet at room temperature tends to increase the adhesive strength and tack strength
- decreasing the fluidity tends to decrease the adhesive strength and tack strength. This can be done by using the property that there is.
- to increase the fluidity there are methods such as increasing the content of a plasticizer and increasing the content of a tackifier.
- the content of the compound may be reduced.
- the plasticizer include a monofunctional acrylic monomer, a monofunctional epoxy resin, a liquid epoxy resin, an acrylic resin, and an epoxy so-called diluent.
- a semiconductor device By using the above-described adhesive sheet of the present invention or the dicing tape-integrated adhesive sheet including the adhesive sheet of the present invention, a semiconductor device can be manufactured.
- the method for manufacturing a semiconductor device of the present invention includes: I) a step of attaching the adhesive sheet of the present invention to a semiconductor wafer, a step of allowing the semiconductor wafer to be cut, and III) attaching a dicing tape to the adhesive sheet of the present invention. 1) —1—1—11, II—I—III or I—III—II, and IV) by cutting the semiconductor wafer and the adhesive sheet of the present invention. And v) a step of bonding the semiconductor chip with the adhesive sheet to a supporting member for mounting the semiconductor chip.
- FIG. 1 shows the process of attaching the adhesive sheet 1 of the present invention to the semiconductor wafer A.
- FIG. 2 shows that the laser beam is applied to the cutting line 4 of the semiconductor wafer A. Irradiation to form a modified area (scheduled section) 5 inside the wafer so that the wafer can be cut.
- Figure 3 shows the adhesive layer 1a and the base layer 2 on the adhesive sheet 1.
- b) a step of attaching dicing tape 2 consisting of b
- FIG. 4 shows a step of cutting semiconductor wafer A and adhesive sheet 1 by expanding dicing tape 2
- FIG. 5 shows a semiconductor chip with an adhesive sheet Bonding the semiconductor chip 6 to the semiconductor chip mounting support member 7.
- the temperature at which the adhesive sheet is attached to the wafer in the above step I), that is, the lamination temperature is preferably in the range of 0 ° C to 170 ° C, and 20 ° C to reduce the warpage of the wafer.
- the temperature is more preferably in the range of 130 ° C to 130 ° C, particularly preferably in the range of 20 ° C to 60 ° C.
- the wafer can be cut, for example, a method of processing a groove to be a fold without completely cutting a chip with a dicing cutter or irradiating laser light inside the wafer on the line to be cut And a method of easily cutting the wafer by applying an external force or the like thereafter.
- the method of laser processing of the wafer the methods described in Japanese Patent Publication No. 2002-192370 and Japanese Patent Publication No. 2003-338467 can be used.
- For the equipment for example, use MAHOHD ICI NG MACHINE manufactured by Tokyo Seimitsu Co., Ltd. Can be.
- the laser beam to the semiconductor wafer may be irradiated from the front surface of the semiconductor wafer, that is, the surface on which the circuit is formed, or the back surface of the semiconductor wafer, that is, the adhesive sheet on which the circuit is not formed, is attached. Irradiation may be performed from the side surface.
- the adhesive sheet or the dicing tape can irradiate the semiconductor wafer with laser light. It is preferable to use a tape that transmits laser light as the dicing tape. Further, it is preferable that the adhesive sheet is different from the dicing tape in transparency and color tone from the viewpoint of easily recognizing a broken part, that is, a part that could not be cut.
- a laser beam is irradiated from the front side of the silicon wafer along the line to be cut along a line to be cut, by setting a focal point inside the silicon wafer using the above-mentioned laser processing apparatus under the following conditions.
- a modified region is formed inside the box. With this modified region, the wafer can be cut along the line to be cut.
- the modified region is preferably a melt-processed region formed by locally heating and melting the inside of the semiconductor wafer by multiphoton absorption.
- Pulse width 30 ns
- Output 20 J / pulse
- step III Moving speed of the mounting table on which the semiconductor substrate is mounted: 10 OmmZ seconds
- step III a dicing tape is formed by a conventionally known method, and the surface of the adhesive sheet on which the semiconductor layer 8 is adhered is bonded to the dicing tape. Can be attached to the opposite side.
- Pasting temperature, that is, laminating temperature is o ° c ⁇
- the reaction is preferably performed in the range of 60 ° C, more preferably in the range of 1 O: to 40 ° C, and still more preferably in the range of 15 ° C to 30 ° C.
- step III) after step II), it is preferable to perform lamination while supporting the wafer so that the wafer is not deformed in order to prevent the wafer from being broken due to stress or deformation in the laminating step.
- the method for manufacturing a semiconductor device of the present invention may include a step of attaching the dicing tape-integrated adhesive sheet of the present invention to a semiconductor wafer as step I ′) instead of steps I) and III).
- the method for manufacturing a semiconductor device of the present invention includes the following steps: I ′) a step of attaching the dicing tape-integrated adhesive sheet of the present invention to a semiconductor wafer; and II) a step of cutting the semiconductor wafer. II or II-I ', in order. IV) By cutting the semiconductor wafer and the adhesive sheet of the dicing table-type adhesive sheet of the present invention, a plurality of individualized semiconductor chips with the adhesive sheet are obtained. Process, and V) adhesive Bonding the semiconductor chip with the support to the semiconductor chip mounting support member.
- FIG. 6 shows a process of attaching the dicing tape-integrated adhesive sheet 3 of the present invention to the semiconductor wafer A.
- FIG. 7 shows a process of cutting the semiconductor wafer A by half-cutting using a dicing saw 23.
- FIG. 8 shows a state in which an external force is applied to the dicing tape-integrated adhesive sheet 3 to cut off the wafer A and the adhesive sheet 1 of the dicing tape-integrated adhesive sheet 3, and
- FIG. 9 shows the semiconductor chip 6 with the adhesive sheet. Bonding the semiconductor chip to the support member 7 for mounting a semiconductor chip. Further, FIG.
- the combination of the method of attaching the adhesive sheet and the dicing tape to the wafer and the dicing method are not particularly limited. From the viewpoint of workability and efficiency, it is most preferable that the combination is such that the dicing tape-integrated adhesive sheet of the present invention is attached to a wafer and stealth dicing is performed.
- the bonding temperature that is, the lamination temperature is preferably in the range of 0 ° C to 170 ° C, and in the range of 20 ° C to 130 ° C in order to reduce the warpage of the wafer. Is better Particularly preferably, it is in the range of 20 ° (: to 60 ° C).
- step IV) is performed.
- the cutting of the semiconductor wafer and the adhesive sheet is performed using a dicing tape or a dicing tape. This can be done by applying an external force to the body adhesive sheet.
- the external force is preferably applied in a bending direction or a twisting direction, and in the case of stealth dicing, it is preferable to apply the external force in a pulling (expanding) direction.
- a commercially available wafer expanding device can be used. More specifically, as shown in FIG. 4, the ring 11 is attached and fixed to the periphery of the dicing tape 2 placed on the stage 13, and then the push-up portion 12 is raised, whereby the dicing is performed. Apply tension to tape 2 from both ends. If the speed at which the push-up portion rises at this time is defined as the expand speed, and the height 14 at which the push-up portion rises is defined as the expand amount, in the present invention, the expanse speed is 10 to 100 O mmZ seconds.
- the expanded amount is preferably from 5 to 3 Omm, more preferably from 10 to 3 Omm, and particularly preferably from 15 to 2 Omm. If the expansion speed is less than 1 Om mZ seconds, it tends to be difficult to cut the semiconductor wafer and the adhesive sheet, and if it exceeds 100 O mmZ seconds, the dicing tape tends to be broken. . Further, if the expanded amount is less than 5 mm, it tends to be difficult to cut the semiconductor wafer and the adhesive sheet, If it exceeds 30 mm, the dicing tape tends to break easily.
- the expansion amount exceeds 25 mm, it is preferable to use a vinyl chloride base material as the base layer of the dicing tape.However, when the stretch amount is small, use various polyolefin base materials. It is preferable to do so.
- the expansion is preferably performed at room temperature, but may be adjusted at a temperature between ⁇ 50 T and 100 ° C. as necessary. In the present invention, the temperature is preferably from 50 to 60 ° C, more preferably from 0 to 40 ° C. Temperature Expanded is more towards the low temperature, less elongation at break of contact adhesive sheet, for easy cutting preferable because of preventing the yield decreases due to poor cutting of the adhesive sheet ⁇
- a UV-curable adhesive is used for the adhesive layer of the dicing tape, irradiate ultraviolet light from the side opposite to the surface where the semiconductor chip is attached to the dicing tape before or after expanding, Curing The adhesive is cured. As a result, the adhesion between the UV-curable pressure-sensitive adhesive and the adhesive sheet is reduced, and pickup in the subsequent step V) is facilitated.
- step V) a plurality of individualized contacts are used as a pickup means using an adsorption collet 21 and a needle 22 as shown in FIGS. 5 and 9.
- the semiconductor chip with the contact sheet is picked up, placed on the semiconductor chip mounting portion of the semiconductor chip mounting support member, and the adhesive sheet is heated and cured. Heat curing is usually performed at a temperature of 100 to 220 ° C.
- the method of manufacturing a semiconductor device according to the present invention is not limited to the above steps, but may include any steps. For example, at any stage after performing step I) or step I ') and before performing step IV), irradiating the adhesive sheet with ultraviolet light, infrared light, or microwave, or heating or bonding the adhesive sheet. A cooling step may be included. After performing step V), a wire bonding step, a sealing step, and the like shall be included as necessary.
- Bisphenol F-type epoxy resin (epoxy equivalent: 160, trade name: YD-811 C manufactured by Toto Kasei Co., Ltd.) used as epoxy resin 30 parts by weight, cresol nopolak type epoxy resin (epoxy equivalent: 21 0, using YDCN—703 manufactured by Toto Kasei Co., Ltd.) 10 parts by weight; phenol nopolak resin as a curing agent for epoxy resin (Plaofen LF 288 8 2 manufactured by Dainippon Ink and Chemicals, Inc.) 27 parts by weight; epoxy group-containing acrylic rubber as epoxy group-containing acryl-based copolymer (weight average molecular weight 800,000 by gel permeation chromatography, glycidyl methacrylate 3% by weight, T g _ 7 ° C , Nagase ChemteX Corporation brand name HTR-860 P-3 table 1
- HTR-860 P-3 parts by weight 28 44.1 33.1 31.7 28.3 28.0 180 28.3 66.1 44.1 66.1
- Polymer fraction The weight fraction of the high molecular weight component having a weight average molecular weight of 50,000 to 100,000 at a Tg of -10 to 50 ° C and excluding the filler component from all components of the adhesive sheet. rate
- This adhesive varnish was applied on a 50 im-thick release-treated polyethylene terephthalate film, and was heated and dried at 90 ° C for 10 minutes and at 120 ° C for 5 minutes to obtain a film thickness of 25 z / As a m-thick coating film, an adhesive sheet in a B-stage state was produced. In addition, an adhesive sheet in a B stage state having a film thickness of 75/2 m was produced by the same operation.
- An adhesive sheet was produced in the same manner as in Example 1 for the compositions shown in Table 1.
- the adhesive sheet of Example 6 was obtained by heat-treating the sheet obtained in Example 1 at 40 ° C. for 24 hours to reduce the elongation at break.
- An adhesive sheet was produced in the same manner as in Example 1 for the compositions shown in Table 1.
- the adhesive sheet having a film thickness of 75 m was used for the elastic modulus, and the film thickness was 25 for the other items.
- the evaluation was performed using an m adhesive sheet. Table 2 shows the obtained results.
- the tensile strength and breaking elongation of the adhesive sheet in the B-stage state at 25 ° C were measured for a sample with a width of 10 mm, a length of 30 mm, and a thickness of 25 / m. 55), the stress and strain curves were measured at a chuck distance of 20 mm and a pulling speed of 0.5 m / min.
- Breaking strength (P a) the maximum intensity (N) cross-sectional area of Z samples (m 2)
- Elongation at break (%) (length between chucks of sample at break (mm)-20) / 20X100
- Mass A For residual volatiles, weigh a B-stage film cut to 5 cm square (mass A), leave it in a dryer at 170 ° C for 1 hour on a releasable substrate, and measure it again. (Mass B) was obtained from the following equation.
- Residual volatiles () (A-B) X 1 00 / A
- the storage elastic modulus of the adhesive sheet in the B-stage state was measured using a dynamic viscoelasticity measuring device (DVE-V4, manufactured by Rheology Inc.) (sample size: length 20 mm, width 4 mm, film thickness 75 m, Temperature range 1 to 30; L 0 ° C, heating rate 5 ° CZmin, tensile mode, 10 Hz or 900 Hz, automatic static load).
- DVE-V4 dynamic viscoelasticity measuring device
- a chip (5 mm square) is plated with gold on an adhesive sheet.
- (Flexible substrate with copper foil is plated with gold (Ni: 5 m, Au: 0.3 ⁇ m) ) And cured at 130 ° C., 30 min + 170 ° C. for 1 h.
- the peel strength of this sample was measured at 260 ° C. before moisture absorption at 85 ° C. and 85% RH for 48 hours.
- thermo-compression tester manufactured by Tester Sangyo Co., Ltd.
- the sample obtained by punching the adhesive sheet and PET film into a 1 x 2 cm strip was used for 18 seconds at a hot plate temperature of 160 and a pressure of IMP a
- the length of the resin protruding from the end of the sample was measured with an optical microscope, and this was defined as the amount of the opening.
- the thickness of the dicing tape was 80 / im.
- a semiconductor wafer to be diced was attached to the adhesive sheet surface of the dicing tape integrated adhesive sheet. At this time, a semiconductor wafer having a thickness of 80 m was used as the semiconductor wafer.
- the laminating temperature was 60 ° C.
- the wafer is half-cut dicing using a dicing cutter, followed by washing and drying, and processing is performed so that at least two or more semiconductor chips can be obtained when an external force is applied to the semiconductor wafer. did.
- the adhesive sheet and the semiconductor wafer were cut by bending the dicing tape-integrated adhesive sheet to obtain a semiconductor chip with an adhesive sheet.
- the semiconductor wafer and the adhesive sheet were cut 90% or more of the half-cut dicing distance and cut at the same time.
- a semiconductor device sample (formed with a solder pole on one side) was prepared by bonding a semiconductor element and an adhesive sheet cut into a square of 5 mm and a wiring board using a polyimide film with a thickness of 25 m as a base material. was examined. For the evaluation method of heat resistance, reflow crack resistance and temperature cycle test were applied.
- the evaluation of the reflow crack resistance was performed by measuring the maximum temperature of the sample surface at 260 ° C and setting the IR reflow temperature to maintain this temperature for 20 seconds. —The sample was passed through a furnace, and the process of cooling it by leaving it at room temperature was repeated twice. Cracks in the sample were visually observed and observed with an ultrasonic microscope. Samples in which no cracks occurred in all 10 samples were marked with “ ⁇ ”, and samples in which one or more samples had cracks were marked with “X”.
- the temperature cycling resistance was as follows: the sample was left for 30 minutes in an atmosphere of -55 ° C for 30 minutes, and then left for 30 minutes in an atmosphere of 125 ° C. Using an acoustic microscope, specimens in which delamination such as peeling or cracking did not occur in all 10 samples were designated as ⁇ , and those in which one or more specimens occurred were designated as X.
- Example 1 the elastic modulus, the breaking strength and the breaking elongation were within the ranges specified in the present invention, and the laminating property and the breaking property were good. In addition, because of its low tack strength at room temperature, it has excellent handling properties, and because of its excellent high-temperature adhesive strength, it has excellent reflow crack resistance and temperature cycle resistance. In Example 5, the breakability was good, but the laminability at 60 ° C was poor, and it was not suitable for low-temperature lamination. In Comparative Examples 1 to 5, the elastic modulus, the breaking strength, and the breaking elongation were out of the range of the present invention, and all of them were poor in breaking properties.
- An adhesive sheet was laminated on a semiconductor wafer (80 m thick) of a semiconductor wafer to be diced by hot roll laminating (Riston manufactured by DuPont) at 60 ° C.
- the resulting semiconductor wafer A with an adhesive sheet was irradiated with a laser beam as shown in FIG. 2 to form a modified region inside the wafer.
- a dicing tape (UC 3004M-80, manufactured by Furukawa Electric Co., Ltd.) was laminated on the other side of the adhesive sheet.
- a stainless steel ring was attached to the outer periphery of the dicing tape.
- the ring was fixed and the dicing tape was expanded using an expendable device. In this expanding condition, the expanding speed was 30 mm / and the expanse amount was 15 mm.
- a semiconductor wafer 80 m thick
- a dicing tape integrated sheet with an adhesive sheet and a dicing tape (Furukawa Electric Co., Ltd. (UC3004M-80)) laminated on the wafer is used for hot-opening and laminating (DuPont). (Riston) at 60 ° C.
- a stainless steel ring was attached to the outer periphery of the dicing tape.
- the ring was fixed and the dicing tape was expanded by an expanding device. In this expanding condition, the expanding speed was 30 mm / s, and the expanding amount was 15 mm.
- a semiconductor wafer 80 m thick was irradiated with laser light to form a modified region inside the wafer.
- the adhesive sheet was laminated on the wafer with a hot laminator (Riston manufactured by Du Pont) at 60, and then the adhesive sheet was heated at 120 ° C for 10 minutes.
- a dicing tape (Furukawa Electric Co., Ltd. (UC 3 004 M—80)) were laminated.
- a stainless steel ring was attached to the outer periphery of the dicing tape. The ring was fixed and the dicing tape was expanded by an expanding device. Under these expanding conditions, the expanding speed was 30 mm / s, and the expanding amount was 15 mm.
- the length 8 of the adhesive sheet that protruded from the end of the chip without being ruptured was used as the protruding length.
- the case where the length is 0 to less than 20 zm is extremely good ( ⁇ ) 20 to;
- the modulus of elasticity, the breaking strength, and the breaking elongation were out of the range of the present invention, and all of them had poor breaking properties.
- the present invention can be attached to a wafer at a low temperature of 10 ° C. or less, is flexible enough to be handled at room temperature, and can be cut simultaneously with the wafer under ordinary cutting conditions. It is possible to provide a certain adhesive sheet.
- the adhesive sheet of the present invention in the dicing step in the manufacture of a semiconductor device, a wafer cutting method such as half-cut dicing and stealth dicing and a method using an adhesive sheet of a wafer backside bonding method are simultaneously applied. Therefore, the dicing step can be performed efficiently.
- the adhesive sheet of the present invention even when an ultra-thin wafer having a thickness of 100 m or less is used, it is not necessary to cut the wafer and the adhesive sheet at the same time using a dicing machine. Speed can be increased. Therefore, according to the adhesive sheet of the present invention, it is possible to improve the processing speed and the yield of the semiconductor device.
- the cut surfaces of the chip and the adhesive sheet can be matched within 100 or less. Even if the cutting is not performed, it is possible to easily confirm whether or not the adhesive sheet can be separated, so that the semiconductor device can be efficiently manufactured without causing a pickup failure.
- the bonding reliability is excellent in the bonding process of the semiconductor element and the supporting member for mounting the semiconductor element in the manufacture of the semiconductor device. That is, the adhesive sheet of the present invention has heat resistance and moisture resistance necessary for mounting a semiconductor element on a support member, and is excellent in workability.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
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Abstract
Description
Claims
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020117029423A KR101215728B1 (ko) | 2003-06-06 | 2004-06-04 | 반도체 장치의 제조방법 |
KR1020117015582A KR101169182B1 (ko) | 2003-06-06 | 2004-06-04 | 반도체 장치의 제조방법 |
KR1020057023097A KR101204197B1 (ko) | 2003-06-06 | 2004-06-04 | 접착시트, 다이싱 테이프 일체형 접착시트 및 반도체장치의 제조방법 |
JP2005506837A JP5017861B2 (ja) | 2003-06-06 | 2004-06-04 | 接着シート、及びダイシングテープ一体型接着シート |
KR1020127008270A KR101177251B1 (ko) | 2003-06-06 | 2004-06-04 | 접착시트, 다이싱 테이프 일체형 접착시트 및 반도체 장치의 제조방법 |
KR1020127008271A KR101177250B1 (ko) | 2003-06-06 | 2004-06-04 | 접착시트, 다이싱 테이프 일체형 접착시트 및 반도체 장치의 제조방법 |
US10/559,684 US20060128065A1 (en) | 2003-06-06 | 2004-06-04 | Adhesive sheet, dicing tape intergrated type adhesive sheet, and semiconductor device producing method |
US12/047,200 US20080171187A1 (en) | 2003-06-06 | 2008-03-12 | Adhesive sheet, dicing tape integrated type adhesive sheet, and method of producing semiconductor device |
US12/219,188 US7875500B2 (en) | 2003-06-06 | 2008-07-17 | Bonding semiconductor wafer stuck on dicing tape laminated adhesive sheet onto mounting support |
US12/219,187 US7968194B2 (en) | 2003-06-06 | 2008-07-17 | Dicing tape laminated with adhesive sheet of polymer, thermosetting resin and filler |
US12/219,189 US7968195B2 (en) | 2003-06-06 | 2008-07-17 | Dicing tape laminated with adhesive sheet of polymer, epoxy resin and filler |
US13/658,985 US8617930B2 (en) | 2003-06-06 | 2012-10-24 | Adhesive sheet, dicing tape integrated type adhesive sheet, and method of producing semiconductor device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2003-161656 | 2003-06-06 | ||
JP2003161656 | 2003-06-06 | ||
JP2003402748 | 2003-12-02 | ||
JP2003-402748 | 2003-12-02 |
Related Child Applications (5)
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US10559684 A-371-Of-International | 2004-06-04 | ||
US12/047,200 Division US20080171187A1 (en) | 2003-06-06 | 2008-03-12 | Adhesive sheet, dicing tape integrated type adhesive sheet, and method of producing semiconductor device |
US12/219,188 Division US7875500B2 (en) | 2003-06-06 | 2008-07-17 | Bonding semiconductor wafer stuck on dicing tape laminated adhesive sheet onto mounting support |
US12/219,187 Division US7968194B2 (en) | 2003-06-06 | 2008-07-17 | Dicing tape laminated with adhesive sheet of polymer, thermosetting resin and filler |
US12/219,189 Division US7968195B2 (en) | 2003-06-06 | 2008-07-17 | Dicing tape laminated with adhesive sheet of polymer, epoxy resin and filler |
Publications (1)
Publication Number | Publication Date |
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WO2004109786A1 true WO2004109786A1 (ja) | 2004-12-16 |
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ID=33513388
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PCT/JP2004/008150 WO2004109786A1 (ja) | 2003-06-06 | 2004-06-04 | 接着シート、ダイシングテープ一体型接着シート、及び半導体装置の製造方法 |
Country Status (5)
Country | Link |
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US (6) | US20060128065A1 (ja) |
JP (2) | JP5017861B2 (ja) |
KR (5) | KR101215728B1 (ja) |
TW (3) | TWI401302B (ja) |
WO (1) | WO2004109786A1 (ja) |
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TWI401302B (zh) | 2013-07-11 |
KR101215728B1 (ko) | 2012-12-26 |
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US20090186216A1 (en) | 2009-07-23 |
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US20080286594A1 (en) | 2008-11-20 |
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US8617930B2 (en) | 2013-12-31 |
TW200909595A (en) | 2009-03-01 |
US20080171187A1 (en) | 2008-07-17 |
KR20110138301A (ko) | 2011-12-26 |
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TW200911956A (en) | 2009-03-16 |
KR101169182B1 (ko) | 2012-07-30 |
US20080305583A1 (en) | 2008-12-11 |
US20130224932A9 (en) | 2013-08-29 |
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KR20110094117A (ko) | 2011-08-19 |
US20060128065A1 (en) | 2006-06-15 |
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