WO2014175321A1 - 半導体ウェハ保護用粘着テープ - Google Patents
半導体ウェハ保護用粘着テープ Download PDFInfo
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- WO2014175321A1 WO2014175321A1 PCT/JP2014/061401 JP2014061401W WO2014175321A1 WO 2014175321 A1 WO2014175321 A1 WO 2014175321A1 JP 2014061401 W JP2014061401 W JP 2014061401W WO 2014175321 A1 WO2014175321 A1 WO 2014175321A1
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- semiconductor wafer
- adhesive tape
- cast film
- film layer
- protecting
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
Definitions
- the present invention relates to an adhesive tape for protecting a semiconductor wafer used in a gas etching process and a plasma dicing process.
- FIG. 3 (a) and 3 (b) are chip layout diagrams of the small-diameter semiconductor wafer 21 and the large-diameter semiconductor wafer 31.
- FIG. 3A In the chip arrangement in which the chips 23 are arranged in a grid pattern as shown in FIG. 3A, dicing by a conventional dicing blade was possible.
- the area that cannot be used increases if patterning is performed on the wafer surface, and many chips cannot be used as products. To do. Therefore, in order to increase the yield of chips, the system is changing to a method in which the chips 33 are densely arranged on the outer peripheral portion of the semiconductor wafer 31 as shown in FIG.
- FIG. 3A Since the conventional method of arranging the chips at equal intervals (FIG. 3A) is a method in which the chips are arranged in various directions (FIG. 3B) instead of the same direction, scribe (dicing) Line) is not a straight line, and linear dicing with a blade becomes difficult.
- dicing can be performed in cases other than straight lines using a laser or the like, and a dicing line is formed by selectively irradiating the inside of the semiconductor wafer with laser light to form a modified portion.
- a so-called stealth dicing method has been proposed in which a semiconductor wafer is cut starting from the above (Patent Document 1).
- Patent Document 1 A so-called stealth dicing method has been proposed in which a semiconductor wafer is cut starting from the above.
- Patent Document 1 since the cutting of the chip with a laser damages the chip, there is a problem that the anti-deposition strength of the chip does not increase.
- Plasma dicing is a method of dividing a semiconductor wafer by selectively etching a portion not covered with a mask with plasma.
- this dicing method is used, the chip can be selectively divided, and even if the scribe line is bent, it can be divided without any problem.
- the etching rate is very high, it has been regarded as one of the most suitable processes for chip cutting in recent years.
- a fluorine-based gas having a very high reactivity with a wafer such as sulfur hexafluoride (SF 6 ) or carbon tetrafluoride (CF 4 ), is used as a plasma generating gas.
- SF 6 sulfur hexafluoride
- CF 4 carbon tetrafluoride
- the adhesive tape for protecting the semiconductor wafer is thermally deteriorated.
- the heat-degraded adhesive tape for protecting a semiconductor wafer does not use the adhesive tape for protecting a semiconductor wafer because the adhesive remains on the adherend or the peeling performance is lost.
- Gas cluster etching is a method of processing a wafer by spraying gas toward a vacuum atmosphere to form a cluster of gas molecules and colliding with the wafer (Patent Document 3).
- the clusters that collide with the wafer give kinetic energy to the wafer, and then are decomposed and scattered as gas molecules. Thereby, the wafer surface can be etched.
- chlorine trifluoride (ClF 3 ) gas is used as a reactive gas, and since the bond of Cl—F is very small, plasma such as carbon tetrafluoride (CF 4 ) is generated. Since it is not necessary to ionize in advance like the working gas, the damage to the substrate is extremely small, and protection with a mask is not required, and the chip can be easily cut.
- heat is generated due to a chemical reaction between the wafer and gas molecules when performing wafer processing. This heat generation may exceed 200 ° C., and in the processing method involving such heat generation, the base film is fused by heat to the chuck table holding the semiconductor wafer protection tape, or the base film shrinks. Therefore, it is necessary to prevent the semiconductor wafer from being damaged.
- the present invention provides a heat-resistant and heat-shrinkable adhesive tape for protecting a semiconductor wafer that does not melt or shrink excessively even when exposed to high heat in a gas etching process or a plasma dicing process.
- the purpose is to provide.
- the following invention is provided.
- the base film has a cast film layer containing a cured resin as an outermost layer on the side where the pressure-sensitive adhesive layer is not formed, and a speed of 30 mm when bringing a 3.0 mm diameter SUS304 probe into contact with a measurement sample.
- Tack force of the cast film layer measured by probe tack when the probe is peeled upward at a peeling speed of 600 mm / min under the conditions where the contact load is 100 gf and the contact time is 1 second.
- the adhesive tape for semiconductor wafer protection characterized by having a peak value of 100 kPa or less at 200 ° C.
- the above-mentioned cast film layer is composed of a curing agent or an acrylic copolymer cured by radiation, for protecting a semiconductor wafer according to any one of (1) to (3) Adhesive tape.
- the probe was peeled off at 600 mm / min under the conditions of 30 mm / min when a SUS304 probe having a diameter of 3.0 mm was brought into contact with the measurement sample, a contact load of 100 gf, and a contact time of 1 second.
- Any of (1) to (5), wherein the peak value of the tack force of the pressure-sensitive adhesive layer measured by probe tack when peeled upward at a speed is 50 to 400 kPa at 25 ° C.
- the adhesive tape for semiconductor wafer protection as described in 2.
- the adhesive tape for protecting a semiconductor wafer has heat resistance and heat shrinkage resistance, and does not melt or shrink excessively to the chuck table. Can be provided.
- FIG. 1A is a cross-sectional view showing an adhesive tape 1 for protecting a semiconductor wafer according to this embodiment
- FIG. 1B is a cross-sectional view showing an adhesive tape 1a for protecting a semiconductor wafer according to this embodiment.
- the adhesive tape 1 for protecting a semiconductor wafer has a base film 3 and an adhesive layer 5 provided on the base film 3.
- Each layer may be cut (precut) into a predetermined shape in advance according to the use process and the apparatus.
- the adhesive tape 1 for protecting a semiconductor wafer according to the present embodiment may be cut for each wafer, or may be a roll of a long sheet rolled up. Good. Below, the structure of each layer is demonstrated.
- the base film 3 has a cast film layer 7 containing a cured resin as an outermost layer on the side where the pressure-sensitive adhesive layer 5 is not formed.
- 1A shows the base film 3 in which the cast film layer 7 and the resin film layer 9 are laminated. As long as the outermost layer is the cast film layer 7, the base film 3 has the resin film layer 9 on the base film 3. Other resin layers may be laminated.
- the cast film layer is a layer obtained by applying a resin composition. Since the cast film layer 7 uses a resin having a three-dimensional network structure by cross-linking, it is difficult to soften even when exposed to a high temperature and hardly cause fusion to the chuck table. In addition, since the cast film layer 7 is formed by coating, there is little residual stress, there is little thermal shrinkage even when exposed to high temperatures, and chip position misalignment hardly occurs in the gas etching process.
- the base film 3 is comprised only by the cast film layer 7, and the adhesive tape 1a for semiconductor wafer protection which has the adhesive layer 5 on the single side
- the adhesive tape 1 a for protecting a semiconductor wafer includes the resin film layer 9, the cast film layer 7, and the like. Compared to the adhesive tape 1 for protecting a semiconductor wafer that uses the base film 3 laminated with the film, the adhesive tape has a low thermal shrinkage rate. Since the semiconductor wafer protecting adhesive tape 1a has a low thermal shrinkage rate, even in a gas etching process exposed to a high temperature, displacement of the position of a chip as an adherence hardly occurs and kerf shrink hardly occurs.
- the tack force of the cast film layer 7 is 100 kPa or less at 200 ° C., preferably 50 kPa, more preferably 30 kPa or less.
- the tack force here is a peak value of the tack force measured by the probe tack.
- the tack force of the cast film layer 7 exceeds 100 kPa at 200 ° C., the cast film layer 7 tends to adhere to the chuck table when heated in a gas etching step or the like.
- it is preferable that the tack force of the cast film layer 7 is 20 kPa or less at 25 degreeC. When the tack force of the cast film layer 7 exceeds 20 kPa at 25 ° C., peeling from the chuck table at room temperature becomes worse. Further, when the pressure-sensitive adhesive tape is rolled, blocking may occur.
- the resin film 9 is not particularly limited, but the resins used are polyethylene, polypropylene, ethylene-propylene copolymer, polybutene-1, poly-4-methylpentene-1, ethylene-vinyl acetate copolymer, ethylene -Acrylic acid copolymer, homopolymer or copolymer of ⁇ -olefin such as ionomer, or a mixture thereof, engineering plastics such as polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyurethane, styrene-ethylene-butene or pentene copolymer A thermoplastic elastomer such as a polymer can be listed.
- the thickness of the base film 3 is preferably 50 to 200 ⁇ m.
- the thickness of the cast film layer 7 is preferably 5 to 100 ⁇ m and more preferably 5 to 50 ⁇ m. preferable.
- the thickness of the cast film layer 7 is preferably 50 to 200 ⁇ m, and more preferably 50 ⁇ m to 100 ⁇ m.
- the thickness of the resin film layer 9 is not particularly limited, but is generally in the range of 50 to 150 ⁇ m.
- the cast film layer 7 is preferably composed of a coating of an acrylic polymer or a polyester resin composition and further curing with a curing agent or radiation.
- the cast film layer 7 formed by coating has less residual stress and less heat shrinkage even when exposed to high temperatures, compared to a stretched film formed by extrusion and further thinned by a stretching process.
- the cast film layer 7 according to the present embodiment has a three-dimensional network structure by cross-linking and has a small tack force at 200 ° C., and therefore does not fuse to the chuck table even when exposed to high temperatures.
- the breaking strength of the adhesive tapes 1 and 1a for protecting a semiconductor wafer is 0.5 N / mm or more and the breaking elongation is 200% or more.
- the cast film layer 7 is formed of a cured resin, and is particularly formed of a resin obtained by curing an acrylic copolymer or a polyester resin.
- the acrylic polymer or polyester resin is not particularly limited, and an energy beam curable resin, a curing agent curable resin, a thermosetting resin, or the like is used, preferably an energy beam curable resin or a curing agent curable resin. Resin is used.
- an energy ray curable resin the resin is cured by irradiating energy rays after coating.
- a crosslinking agent is added to the resin and cured by application and drying.
- a thermosetting resin is used, the resin is cured by heating after application.
- the cast film layer 7 When laminating the cast film layer 7 and the resin film layer 9, a method of applying a curable resin to the resin film layer 9 and curing it, or a method of adhering the cured cast film through an adhesive or the like Etc.
- the cast film layer 7 is obtained by applying a curable resin to a peelable film, then curing and peeling the film from the film.
- the acrylic copolymer for forming the cast film layer 7 is not particularly limited.
- the acrylic copolymer and the energy ray polymerizable compound are the main components. .
- Specific examples of these acrylic pressure-sensitive adhesives and energy beam polymerizable compounds are as follows.
- the acrylic pressure-sensitive adhesive contains a (meth) acrylic copolymer and a curing agent as components.
- the (meth) acrylic copolymer include a polymer having (meth) acrylic acid ester as a polymer constituent unit, a copolymer of (meth) acrylic acid ester and a functional monomer, and these polymers. And the like.
- the molecular weight of these polymers a low molecular weight having a weight average molecular weight of about 10,000 to 200,000 is suitable from the viewpoint of stretchability of the base film.
- the curing agent is used for adjusting the adhesive force and cohesive force by reacting with the functional group of the (meth) acrylic copolymer.
- the functional group of the (meth) acrylic copolymer For example, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, 1,3-bis (N, N-diglycidylaminomethyl) toluene, 1,3-bis (N, N-diglycidylaminomethyl) ) Epoxy compounds having two or more epoxy groups in the molecule such as benzene, N, N, N, N'-tetraglycidyl-m-xylenediamine, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate , 1,3-xylylene diisocyanate, 1,4-xylene diisocyanate, diphenylmethane-4,4′-diisocyanate, and the like, isocyanate compounds having two or more isocyan
- the functional group reacts with the curing agent in the (meth) acrylic copolymer. It is desirable to add an equal amount of a curing agent, for example, 2.0 to 30 parts by mass is appropriate for 100 parts by mass of the (meth) acrylic copolymer.
- the energy beam curable resin generally contains the acrylic pressure-sensitive adhesive and the energy beam polymerizable compound as main components.
- the energy ray polymerizable compound for example, a low molecular weight compound having at least two photopolymerizable carbon-carbon double bonds in a molecule that can be three-dimensionally reticulated by ultraviolet irradiation is widely used.
- trimethylolpropane triacrylate tetramethylolmethane tetraacrylate
- pentaerythritol triacrylate pentaerythritol tetraacrylate
- dipentaerythritol monohydroxypentaacrylate dipentaerythritol hexaacrylate
- 1,4-butylene glycol diacrylate 1,6 hexanediol diacrylate
- polyethylene glycol diacrylate oligoester acrylate, and the like are widely applicable.
- Urethane acrylate oligomers can also be used as the acrylic pressure-sensitive adhesive.
- Urethane acrylate oligomers include polyester compounds or polyether compounds such as polyol compounds and polyisocyanate compounds (for example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,3-xylylene diene).
- a hydroxyl group for example, 2-hydroxyethyl
- the mixing ratio of the acrylic pressure-sensitive adhesive and the energy beam polymerizable compound in the energy ray curable resin is 50 to 200 parts by mass, preferably 50 to 200 parts by mass of the energy ray polymerizable compound with respect to 100 parts by mass of the acrylic pressure-sensitive adhesive. It is desirable to blend in the range of 150 parts by mass. In the case of this blending ratio range, the tack force of the energy beam curable resin is greatly reduced after the energy beam irradiation.
- the energy ray curable resin may be an energy ray polymerizable acrylate copolymer instead of blending the energy ray polymerizable compound with the acrylic adhesive as described above. Is possible.
- a photopolymerization initiator such as isopropyl benzoin ether, isobutyl benzoin ether, benzophenone, Michler's ketone, chlorothioxanthone, benzyl methyl ketal, ⁇ -hydroxycyclohexyl phenyl ketone, 2-hydroxymethylphenylpropane or the like can be used in combination.
- the polymerization reaction can be efficiently advanced.
- the energy beam referred to here refers to a light beam such as an ultraviolet ray or an ionizing energy beam such as an electron beam.
- polyester resin for forming the cast film layer 7 is not particularly limited.
- a curing agent curable resin when used, a curing agent curable polyester resin composition and a curing agent are used as main components.
- the curing agent-curable polyester resin composition is a composition containing a polyester resin having a functional group capable of reacting with a curing agent, and preferably a polyester polyol having a hydroxyl group can be used. Moreover, a hardening
- an isocyanate compound having two or more isocyanate groups in the molecule can be used.
- the pressure-sensitive adhesive layer 5 can be formed by applying a pressure-sensitive adhesive to the base film 3.
- the pressure-sensitive adhesive layer 5 constituting the semiconductor wafer protecting pressure-sensitive adhesive tape 1 according to the present embodiment only needs to have a retaining property that does not cause separation from the chip during the gas etching step.
- it is desirable that the amount of outgas is small so as not to contaminate the wafer and the apparatus during heating.
- the tack force of the pressure-sensitive adhesive layer 5 before being irradiated with energy rays or the like is preferably 50 to 400 kPa at 25 ° C. Such tack force does not cause separation between the semiconductor wafer and the chip that are the adherends.
- the configuration of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 5 is not particularly limited, but in order to improve the peelability, an energy ray curable material is preferable, and peeling from the chip 21 is facilitated after curing.
- a material is preferred.
- a pressure-sensitive adhesive having energy ray curability for example, a pressure-sensitive adhesive composition having an acrylic pressure-sensitive adhesive used for forming the cast film layer 7 and an energy ray polymerizable compound as main components can be used.
- energy ray curing may be performed before the gas etching step in order to increase heat resistance.
- the adhesive tape 1 for protecting a semiconductor wafer according to the present embodiment is suitably used for an etching process step using a gas to chips separated by a stealth dicing step.
- FIG. 2 is a cross-sectional view showing a gas etching process in which an etching gas 13 is used to etch a chip 11 from which a semiconductor wafer has been separated by a stealth dicing process.
- an etching gas 13 is used to etch a chip 11 from which a semiconductor wafer has been separated by a stealth dicing process.
- a plurality of chips 11 in which a semiconductor wafer is separated into pieces by a stealth dicing process are fixed to the adhesive tape for protecting a semiconductor wafer fixed to the ring frame 15.
- the chip 11 is held by a chuck table 17. Thereafter, the etching gas 13 is irradiated to etch the exposed surface of the chip 11.
- the modified region by the laser beam remaining in the chip cross section is removed by the gas etching process. Since the modified region is brittle, if the modified region remains on the chip 11, the chip 11 is broken from the modified region. The bending strength of the chip 11 is increased by removing the modified region and the unevenness on the surface of the chip 11.
- gas etching is a method in which chlorine trifluoride (ClF 3 ) gas heated to 200 ° C. is blown into a chamber decompressed to about 1 kPa at a pressure of 0.3 to 2.0 MPa.
- the adhesive tape 1 for protecting a semiconductor wafer is heated by irradiation with the heated etching gas 13 or a chemical reaction between the etching gas 13 and the chip 11.
- the portion in contact with the chuck table 17 is cooled by circulating cooling water through the chuck table 17.
- the adhesive tape 1 for protecting the semiconductor wafer is , It may be heated to about 200 ° C.
- the adhesive tape 1 for protecting a semiconductor wafer according to this embodiment is the chuck table 17. Gas etching is possible without fusing.
- the thermal contraction rate of the adhesive tape for semiconductor wafer protection becomes small, and the position of the chip is shifted or the chips are in contact in the gas etching process. Can be prevented.
- the heat shrinkage rate of the adhesive tape for protecting a semiconductor wafer is further reduced.
- UV curable acrylic copolymer composition A is as follows: Acrylic ester copolymer 100 parts by mass Curing agent ("Coronate L” (trade name) manufactured by Nippon Polyurethane) 2 parts by mass Radiation polymerizable Compound 150 parts by mass Photopolymerization initiator ("Irgacure 184" (trade name) manufactured by Ciba Geigy Japan) 5 parts by mass
- the acrylic ester copolymer and the radiation polymerizable compound are as follows.
- Acrylic ester copolymer A copolymer obtained by copolymerizing 2-ethylhexyl acrylate, methyl acrylate and 2-hydroxyethyl acrylate, having a weight average molecular weight of 100,000 and a glass transition point of ⁇ 10 ° C.
- Radiation polymerizable compounds Urethane acrylate oligomer with a weight average molecular weight of 1100
- the curing agent-curable polyester resin composition is coated on a release film, dried, bonded to another release film, cured and cured for 1 week, and then peeled off from the release film. Got.
- the thickness of the cast film B after drying was 70 ⁇ m.
- composition of the curing agent-curable polyester resin composition is as follows: Polyester resin composition (weight average molecular weight: 15,000, glass transition point: 40 ° C.) 100 parts by mass Curing agent (Nippon Polyurethane “Coronate L” (Product name)) 10 parts by mass
- Resin film B A 100 ⁇ m polyethylene terephthalate film (manufactured by Teijin DuPont Films, G2: trade name) was used as the resin film B.
- Adhesive Composition A In 400 g of toluene as a solvent, a mixture of 446.5 g of 2-ethylhexyl acrylate, 45 g of methyl methacrylate, 3.4 g of methacrylic acid, and 0.5 g of benzoyl peroxide as a polymerization initiator was added. While dripping over time, it was made to react at the temperature of 100 degreeC for 4 hours, and the solution of the polymer (2) which has a functional group was obtained.
- Example 1 The pressure-sensitive adhesive composition A prepared on the resin film A side of the film obtained by laminating the cast film A and the resin film A was applied and dried to prepare an adhesive tape for protecting a semiconductor wafer.
- Example 2 The adhesive composition A was applied to the cast film B and dried to prepare an adhesive tape for protecting a semiconductor wafer.
- the probe was peeled upward at a peeling speed of 600 mm / min, the force required for peeling was measured, and the peak value was taken as the tack force.
- the tack force at 200 ° C. was set at 200 ° C. for the probe and plate temperatures.
- Adhesive tape for processing semiconductor wafers is bonded to a mirror wafer with a diameter of 6 inches and a thickness of 100 ⁇ m, and a 6-inch wafer is diced into a 10 mm square from the wafer surface. 20 ⁇ m), a semiconductor wafer processing adhesive tape is adsorbed to the chuck table in a vacuum chamber, and ClF 3 gas etching is performed for 30 seconds. At this time, hot water at 70 ° C. is passed through the chuck table to cool the semiconductor wafer processing adhesive tape and the wafer. After this step, it was evaluated whether the adhesive tape could be easily peeled from the chuck table.
- ⁇ and X in the table mean the following.
- Chip shift evaluation For those that could be processed and peeled off from the chuck table by gas etching evaluation, the chip interval due to dicing was not shifted in the gas etching process. Confirmed. For example, when the interval between chips after the gas etching step is 22 ⁇ m with respect to the cut width of 25 ⁇ m by dicing, the deviation is 3 ⁇ m. ⁇ if the deviation was within ⁇ 1 ⁇ m in all locations, ⁇ if the deviation was within ⁇ 2.5 ⁇ m in all locations, ⁇ if the deviation was ⁇ 2.5 ⁇ m or more in one of the five locations Was x.
- the pressure-sensitive adhesive tape was punched out in a No. 1 dumbbell shape (JIS K 6301) to prepare a test piece, and measured using a tensile test apparatus (JIS B 7721). After putting a 40 mm marked line into the test piece, the load (tensile strength) and elongation at the time of cutting between marked lines were measured using a tensile tester. However, the tensile speed was 300 mm / min.
- the side where the adhesive layer is not formed is the cast film layers A to B, and the tack force of the outermost layer is 100 kPa or less even at 200 ° C. Therefore, the base film of the adhesive tape was not fused to the chuck table in the gas etching process.
- Example 2 since the base film was only a cast film, the shrinkage was small even by heating, and the chip shift was further reduced during the gas etching process.
- the tack force of the outermost layer on the side on which the adhesive of the base film was not formed was 100 kPa or less even at 200 ° C., but it was shrunk due to the residual stress at the time of film forming due to the influence of heating in the etching process.
- the adhesive tape floated from the chuck table and was not cooled by the chuck table discoloration of the wafer and deterioration of the adhesive were observed.
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Abstract
Description
(1)基材フィルムと、前記基材フィルムの片面に形成された粘着剤層とを有し、
前記基材フィルムは、硬化した樹脂を含むキャストフィルム層を前記粘着剤層が形成されない側の最外層に有し、直径3.0mmのSUS304製のプローブを測定試料に接触させる時のスピードを30mm/minとし、接触荷重を100gfとし、接触時間を1秒とした条件において、プローブを600mm/minの剥離速度で上方に引き剥がした際の、プローブタックにより測定された前記キャストフィルム層のタック力のピーク値が200℃において100kPa以下であることを特徴とする半導体ウェハ保護用粘着テープ。
(2)前記基材フィルムが、キャストフィルム層のみからなることを特徴とする(1)に記載の半導体ウェハ保護用粘着テープ。
(3)前記キャストフィルム層が、硬化したアクリル系共重合体またはポリエステル樹脂を含むことを特徴とする(1)または(2)に記載の半導体ウェハ保護用粘着テープ。
(4)前記キャストフィルム層は、硬化剤もしくは放射線により硬化されたアクリル系共重合体で構成するものであることを特徴とする(1)~(3)のいずれかに記載の半導体ウェハ保護用粘着テープ。
(5)破断強度が0.5N/mm以上であり、破断伸度が200%以上であることを特徴とする(1)~(4)のいずれかに記載の半導体ウェハ保護用粘着テープ。
(6)直径3.0mmのSUS304製のプローブを測定試料に接触させる時のスピードを30mm/minとし、接触荷重を100gfとし、接触時間を1秒とした条件において、プローブを600mm/minの剥離速度で上方に引き剥がした際の、プローブタックにより測定された前記粘着剤層のタック力のピーク値が25℃において50~400kPaであることを特徴とする(1)~(5)のいずれかに記載の半導体ウェハ保護用粘着テープ。
図1(a)は、本実施形態に係る半導体ウェハ保護用粘着テープ1を示す断面図であり、図1(b)は、本実施形態に係る半導体ウェハ保護用粘着テープ1aを示す断面図である。
半導体ウェハ保護用粘着テープ1は、基材フィルム3と、基材フィルム3上に設けられた粘着剤層5とを有する。なお、それぞれの層は、使用工程や装置に合わせて予め所定形状に切断(プリカット)されていてもよい。さらに、本実施形態に係る半導体ウェハ保護用粘着テープ1は、ウェハ1枚分ごとに切断された形態であってもよいし、長尺のシートを、ロール状に巻き取った形態であってもよい。以下に、各層の構成について説明する。
基材フィルム3は、硬化した樹脂を含むキャストフィルム層7を、粘着剤層5が形成されない側の最外層に有する。また、図1(a)では、キャストフィルム層7と樹脂フィルム層9を積層した基材フィルム3が示されるが、最外層がキャストフィルム層7である限り、基材フィルム3に樹脂フィルム層9以外の樹脂層が積層していてもよい。
また、キャストフィルム層7のタック力が、25℃において20kPa以下であることが好ましい。キャストフィルム層7のタック力が、25℃において20kPaを超えると、常温でのチャックテーブルからの剥がれが悪くなる。また、粘着テープをロール化する場合にはブロッキングが発生する可能性がある。
また、基材フィルム3を樹脂フィルム層9とキャストフィルム層7の積層とする場合は、キャストフィルム層7の厚さとしては、5~100μmであることが好ましく、5~50μmであることがより好ましい。
基材フィルムをキャストフィルム層7のみで構成する場合は、キャストフィルム層7の厚さは、50~200μmであることが好ましく、50μm~100μmであることがより好ましい。
樹脂フィルム層9の厚さとしては特に制限は無いが、一般的には50~150μmの範囲にあるのが通常である。
キャストフィルム層7は硬化した樹脂により形成され、特にアクリル系共重合体またはポリエステル樹脂を硬化した樹脂により形成される。アクリル系重合体またはポリエステル樹脂は特に限定されるものではなく、エネルギー線硬化型樹脂、硬化剤硬化型樹脂または熱硬化型樹脂等が用いられ、好ましくはエネルギー線硬化型樹脂または硬化剤硬化型の樹脂が用いられる。エネルギー線硬化型樹脂を使用する場合は、塗布後にエネルギー線を照射して樹脂を硬化させる。硬化剤硬化型の樹脂を用いる場合は、樹脂に架橋剤を加え、塗布・乾燥後に養生させることで硬化させる。熱硬化型樹脂を使用する場合は、塗布後に加熱をして樹脂を硬化させる。
キャストフィルム層7を形成するアクリル系共重合体は特に限定されるものではなく、例えばエネルギー線硬化型樹脂を用いる場合はアクリル系粘着剤とエネルギー線重合性化合物とを主成分としてなるものである。これらアクリル系粘着剤、及びエネルギー線重合性化合物については具体的には以下のものが適用可能である。
更には、エネルギー線硬化型樹脂は、上記のようにアクリル系粘着剤にエネルギー線重合性化合物を配合する代わりに、アクリル系粘着剤自体をエネルギー線重合性アクリル酸エステル共重合体とすることも可能である。
キャストフィルム層7を形成するポリエステル樹脂は特に限定されるものではなく、例えば硬化剤硬化型樹脂を用いる場合は硬化剤硬化型のポリエステル樹脂組成物と硬化剤とを主成分としてなるものである。
また、硬化剤は、硬化剤硬化型ポリエステル樹脂組成物が有する官能基と反応して粘着力および凝集力を調整するために用いられるものである。好ましくは、前述の分子中に2個以上のイソシアネート基を有するイソシアネート系化合物を使用することができる。
粘着剤層5は、基材フィルム3に粘着剤を塗工して形成することができる。本実施形態に係る半導体ウェハ保護用粘着テープ1を構成する粘着剤層5は、ガスエッチング工程時においてチップとの剥離を生じない程度の保持性を有するものであればよい。また、加熱時にウェハや装置を汚染しないようアウトガスの少ないものが望ましい。
本実施形態に係る半導体ウェハ保護用粘着テープ1は、ステルスダイシング工程により個片化されたチップへの、ガスによるエッチング処理工程に好適に使用される。
本実施形態に係る半導体ウェハ保護用粘着テープ1を、ガスエッチング工程に適用した場合の、テープの使用方法について、図2を参照しながら説明する。
本実施形態において、チャックテーブル17に接するキャストフィルム層7が、200℃に加熱されてもタック力が所定の値以下であるため、本実施形態に係る半導体ウェハ保護用粘着テープ1はチャックテーブル17に融着せずにガスエッチングが可能である。
(1)基材フィルムの作製
(キャストフィルムAと樹脂フィルムAの積層フィルム)
住友化学製エチレンメチルメタクリレート(EMMA)樹脂「アクリフトWD201(商品名)」を用いて、Tダイ法により厚さ100μmの樹脂フィルムAを成形した。
紫外線硬化型アクリル系共重合体Aを剥離フィルム上に乾燥後の厚さが30μmとなるように塗工し、樹脂フィルムAと貼り合せ、紫外線を照射し、硬化させることで、総厚130μmの樹脂フィルムAとキャストフィルムAの積層フィルムを得た。
アクリル酸エステル共重合体 100質量部
硬化剤(日本ポリウレタン社製「コロネートL」(商品名)) 2質量部
放射線重合性化合物 150質量部
光重合開始剤(日本チバガイギー社製「イルガキュアー184」(商品名)) 5質量部
アクリル酸エステル共重合体:
2-エチルヘキシルアクリレート、メチルアクリレート、2-ヒドロキシエチルアクリレートを共重合して得られた、重量平均分子量が10万、ガラス転移点が-10℃の共重合体。
放射線重合性化合物:
重量平均分子量が1100のウレタンアクリレートオリゴマー
硬化剤硬化型ポリエステル樹脂組成物を、剥離フィルム上に塗工、乾燥させ、別の剥離フィルムと貼りあわせた後、1週間養生し硬化させた後に剥離フィルムから剥がすことでフィルム状のキャストフィルムBを得た。キャストフィルムBの乾燥後の厚さは70μmであった。
ポリエステル樹脂組成物(重量平均分子量:1.5万、ガラス転移点:40℃) 100質量部
硬化剤(日本ポリウレタン社製「コロネートL」(商品名)) 10質量部
100μmのポリエチレンテレフタレートフィルム(帝人デュポンフィルム社製、G2:商品名)を樹脂フィルムBとして用いた。
溶媒のトルエン400g中に、2-エチルヘキシルアクリレート446.5g、メチルメタアクリレート45g、メタクリル酸3.4g、重合開始剤としてベンゾイルペルオキシド0.5gの混合液を2時間かけて滴下しながら、100℃の温度下で4時間反応させ官能基を持つポリマー(2)の溶液を得た。次にこのポリマー溶液(2)に、光重合性炭素-炭素二重結合及び官能基を有する化合物(1)として、2-ヒドロキシエチルメタクリレート5.1g、重合禁止剤としてハイドロキノン0.1gを加え、120℃の温度下で6時間反応させた後、酢酸にて中和し、化合物(A)の溶液を得た。この化合物(A)溶液中の化合物(A)100質量部に対し、ポリイソシアネート(日本ポリウレタン社製:コロネートL)(B)1質量部、光重合開始剤(日本チバガイギー社製イルガキュアー184)0.5質量部を化合物(A)溶液中に加えて混合し、アクリル系エネルギー線硬化性粘着剤組成物Aを調製した。
キャストフィルムAと樹脂フィルムAを積層したフィルムの樹脂フィルムA側に調製した粘着剤組成物Aを塗布・乾燥し、半導体ウェハ保護用粘着テープを作成した。
キャストフィルムBに粘着剤組成物Aを塗布・乾燥し、半導体ウェハ保護用粘着テープを作成した。
樹脂フィルムAに粘着剤組成物Aを塗布・乾燥し、半導体ウェハ保護用粘着テープを作成した。
樹脂フィルムBに粘着剤組成物Aを塗布・乾燥し、半導体ウェハ保護用粘着テープを作成した。
(1)タック力の測定
株式会社レスカのタッキング試験機TAC-IIを用いて行った。測定モードは、設定した加圧値までプローブを押し込み、設定した時間が経過するまで加圧値を保持するようにコントロールし続けるConstant Loadを用いた。セパレータを剥離した後、粘着剤層が形成されない側を上にして基材フィルムをプレート上に置き、上側より直径3.0mmのSUS304製のプローブを接触させた。プローブを測定試料に接触させる時のスピードは30mm/minであり、接触荷重は100gfであり、接触時間は1秒である。その後、プローブを600mm/minの剥離速度で上方に引き剥がし、引き剥がすのに要する力を測定し、そのピーク値をタック力とした。タック力を測定したい温度に合わせて、例えば200℃におけるタック力は、プローブおよびプレート温度を200℃とした。
直径6インチで100μm厚さのミラーウエハに、半導体ウェハ加工用粘着テープを貼り合わせ、ウェハ面より6インチウエハを10mm角にダイシング(基材への切り込み深さ20μm)した後、真空チャンバー内にて、半導体ウェハ加工用粘着テープをチャックテーブルに吸着させ、30秒間ClF3のガスエッチングを行う。なお、この際チャックテーブル内には70℃の温水を流すことで、半導体ウェハ加工用粘着テープおよびウェハの冷却を行う。本工程の後にチャックテーブルから粘着テープが容易に剥離可能かどうか評価を行った。
表中の○、×は、以下を意味する。
「○」・・・ガスエッチング工程後に、粘着テープをチャックテーブルより容易に剥離することができた
「×」・・・ガスエッチング工程後に、粘着テープをチャックテーブルより容易に剥離することができなかったか、粘着テープが破断、溶融した。
ガスエッチング評価にて加工、テープのチャックテーブルからの剥離が可能であったものについて、ダイシングによるチップ間隔がガスエッチング工程でずれていないか光学顕微鏡により、各5箇所において確認を行った。例えば、ダイシングによる切り込み幅25μmに対し、ガスエッチング工程後のチップ間の間隔が22μmである場合、ズレは3μmである。全ての箇所においてズレが±1μm以内であったものを◎、また、全ての箇所においてズレが±2.5μm以内であったものを○、5箇所中、1箇所でもズレが±2.5μm以上であったものを×とした。
粘着テープを1号ダンベル形状(JIS K 6301)で打ち抜いて試験片を作成し、引っ張り試験装置(JIS B 7721)を使用して測定した。試験片に40mmの標線を入れた後、引張試験機を用いて標線間切断時の荷重(引張り強さ)と伸びを測定した。但し、引張速さは300mm/minとした。
3………基材フィルム
5………粘着剤層
7………キャストフィルム層
9………樹脂フィルム層
11………チップ
13………エッチングガス
15………リングフレーム
17………チャックテーブル
21………半導体ウェハ
23………チップ
31………半導体ウェハ
33………チップ
Claims (6)
- 基材フィルムと、前記基材フィルムの片面に形成された粘着剤層とを有し、
前記基材フィルムは、硬化した樹脂を含むキャストフィルム層を前記粘着剤層が形成されない側の最外層に有し、
直径3.0mmのSUS304製のプローブを測定試料に接触させる時のスピードを30mm/minとし、接触荷重を100gfとし、接触時間を1秒とした条件において、プローブを600mm/minの剥離速度で上方に引き剥がした際の、プローブタックにより測定された前記キャストフィルム層のタック力のピーク値が200℃において100kPa以下である
ことを特徴とする半導体ウェハ保護用粘着テープ。 - 前記基材フィルムが、キャストフィルム層のみからなることを特徴とする請求項1に記載の半導体ウェハ保護用粘着テープ。
- 前記キャストフィルム層が、硬化したアクリル系共重合体またはポリエステル樹脂を含むことを特徴とする請求項1または2に記載の半導体ウェハ保護用粘着テープ。
- 前記キャストフィルム層は、硬化剤もしくは放射線により硬化されたアクリル系共重合体で構成するものであることを特徴とする請求項1~3のいずれか1項に記載の半導体ウェハ保護用粘着テープ。
- 破断強度が0.5N/mm以上であり、破断伸度が200%以上であることを特徴とする請求項1~4のいずれか1項に記載の半導体ウェハ保護用粘着テープ。
- 直径3.0mmのSUS304製のプローブを測定試料に接触させる時のスピードを30mm/minとし、接触荷重を100gfとし、接触時間を1秒とした条件において、プローブを600mm/minの剥離速度で上方に引き剥がした際の、プローブタックにより測定された前記粘着剤層のタック力のピーク値が25℃において50~400kPaであることを特徴とする請求項1~5のいずれか1項に記載の半導体ウェハ保護用粘着テープ。
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