WO2015098949A1 - 仮固定用フィルム、仮固定用フィルムシート及び半導体装置 - Google Patents
仮固定用フィルム、仮固定用フィルムシート及び半導体装置 Download PDFInfo
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- WO2015098949A1 WO2015098949A1 PCT/JP2014/084120 JP2014084120W WO2015098949A1 WO 2015098949 A1 WO2015098949 A1 WO 2015098949A1 JP 2014084120 W JP2014084120 W JP 2014084120W WO 2015098949 A1 WO2015098949 A1 WO 2015098949A1
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- temporary fixing
- film
- semiconductor wafer
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- support
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2225/00—Details relating to assemblies covered by the group H01L25/00 but not provided for in its subgroups
- H01L2225/03—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00
- H01L2225/04—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00 the devices not having separate containers
- H01L2225/065—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00 the devices not having separate containers the devices being of a type provided for in group H01L27/00
- H01L2225/06503—Stacked arrangements of devices
- H01L2225/06541—Conductive via connections through the device, e.g. vertical interconnects, through silicon via [TSV]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2225/00—Details relating to assemblies covered by the group H01L25/00 but not provided for in its subgroups
- H01L2225/03—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00
- H01L2225/04—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00 the devices not having separate containers
- H01L2225/065—All the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/648 and H10K99/00 the devices not having separate containers the devices being of a type provided for in group H01L27/00
- H01L2225/06503—Stacked arrangements of devices
- H01L2225/06555—Geometry of the stack, e.g. form of the devices, geometry to facilitate stacking
- H01L2225/06565—Geometry of the stack, e.g. form of the devices, geometry to facilitate stacking the devices having the same size and there being no auxiliary carrier between the devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/35—Mechanical effects
- H01L2924/351—Thermal stress
- H01L2924/3512—Cracking
- H01L2924/35121—Peeling or delaminating
Definitions
- the present invention relates to a temporarily fixing film and a temporarily fixing film sheet used when processing a semiconductor wafer, and a semiconductor device manufactured using these films.
- a so-called BG tape which is called a BG tape
- a BG tape is attached to a semiconductor wafer and ground in a supported state.
- a thinned semiconductor wafer is likely to warp due to the influence of a circuit applied to the surface, and a BG tape, which is a tape material that is easily deformed, cannot sufficiently support a thinned semiconductor wafer.
- semiconductor wafers to be ground are not limited to those with high smoothness, and there are increasing numbers of wafers with surface irregularities exceeding 80 ⁇ m equipped with solder balls on the circuit surface. It is relatively difficult to peel the pressure-sensitive adhesive from such a large uneven surface, and when the adhesive strength of the solder ball is insufficient, there is a concern that the solder ball is missing when the pressure-sensitive adhesive is peeled off. .
- the present invention has been made in view of the above circumstances, and can sufficiently fix a semiconductor wafer on a support, and can easily separate the processed semiconductor wafer from the support and the temporary fixing film.
- An object of the present invention is to provide a temporary fixing film, a temporary fixing film sheet, and a semiconductor device manufactured using these films.
- the present invention includes a temporary fixing step of temporarily fixing a semiconductor wafer to a support via a temporary fixing film, a processing step of processing the semiconductor wafer temporarily fixed to the support, a processed semiconductor wafer as a support, and A temporary fixing film for use in a method for processing a semiconductor wafer comprising a separation step for separating from a temporary fixing film, comprising (A) a high molecular weight component and (B) a silicone-modified resin, and 30 at 110 ° C.
- a temporary fixing film having an elastic modulus of 0.1 to 1000 MPa at 23 ° C. for 1 minute at 170 ° C. for 1 minute.
- the semiconductor wafer can be sufficiently fixed on the support, and the processed semiconductor wafer can be easily separated from the support and the temporarily fixing film.
- the temporary fixing film according to the present invention has the above-described elastic modulus, so that it can be easily peeled even from a semiconductor wafer with unevenness.
- the high molecular weight component (A) has a crosslinkable functional group having a glass transition temperature of ⁇ 50 ° C. to 50 ° C. and a weight average molecular weight of 100,000 to 1,200,000 ( It preferably contains a (meth) acrylic copolymer.
- the (B) silicone-modified resin preferably contains a silicone-modified alkyd resin.
- the content of the (B) silicone-modified resin is preferably 1 to 100 parts by mass with respect to 100 parts by mass of the (A) high molecular weight component.
- the temporary fixing film according to the present invention may further contain (C) a curing accelerator.
- the temporary fixing film according to the present invention preferably has a melt viscosity before curing of 15000 Pa ⁇ s or less at 120 ° C. and a thickness of 10 to 150 nm.
- the temporary fixing film according to the present invention preferably has a 30 ° peel strength between the semiconductor wafer and the temporary fixing film of 300 N / m or less.
- the present invention also provides a temporary fixing film sheet comprising a support film having releasability and the temporary fixing film according to any one of claims 1 to 7 provided on the support film. provide.
- the present invention also provides a semiconductor device including a semiconductor element obtained from a semiconductor wafer processed using the temporary fixing film or the temporary fixing film sheet according to the present invention.
- the semiconductor wafer for temporary fixing which can fully isolate
- a film sheet and a semiconductor device manufactured using these can be provided.
- FIG. 1 (A) is a top view showing an embodiment of a film sheet for temporary fixing according to the present invention
- FIG. 1 (B) is a schematic cross-sectional view along the line II in FIG. 1 (A).
- FIG. 2 (A) is a top view showing another embodiment of the film sheet for temporary fixing according to the present invention
- FIG. 2 (B) is a schematic cross section taken along line II-II in FIG. 2 (A).
- FIG. 3A, 3B, and 3C are schematic cross-sectional views for explaining one embodiment of a method for processing a semiconductor wafer
- FIG. 3D is a semiconductor after processing. It is a top view which shows a wafer.
- FIG. 3A, 3B, and 3C are schematic cross-sectional views for explaining one embodiment of a method for processing a semiconductor wafer
- FIG. 3D is a semiconductor after processing. It is a top view which shows a wafer.
- FIG. 4 is a schematic cross-sectional view for explaining an embodiment of a separation process for separating a processed semiconductor wafer from a support and a temporary fixing film.
- FIG. 5 is a schematic cross-sectional view for explaining an embodiment of a method for manufacturing a semiconductor device.
- the temporary fixing film according to the present embodiment is processed by a temporary fixing step of temporarily fixing a semiconductor wafer to a support via a temporary fixing film, and a processing step of processing the semiconductor wafer temporarily fixed to the support.
- a separation step of separating the semiconductor wafer from the support and the temporary fixing film, and a temporary fixing film used in a method for processing a semiconductor wafer comprising (A) a high molecular weight component and (B) a silicone-modified resin. And having an elastic modulus of 0.1 to 1000 MPa at 23 ° C. after heating at 110 ° C. for 30 minutes and 170 ° C. for 1 hour.
- a polymer having a crosslinkable functional group can be used as the high molecular weight component (A) used in this embodiment.
- the polymer include polyimide resin, (meth) acrylic copolymer, urethane resin polyphenylene ether resin, polyetherimide resin, phenoxy resin, and modified polyphenylene ether resin.
- a (meth) acrylic copolymer having a crosslinkable functional group is preferable.
- (meth) acryl is used to mean either acrylic or methacrylic.
- the above resins may be used alone or in combination of two or more.
- (meth) acrylic copolymer having a crosslinkable functional group one obtained by a polymerization method such as pearl polymerization or solution polymerization may be used, or a commercially available product may be used.
- the polymer may have a crosslinkable functional group in the polymer chain or at the end of the polymer chain.
- the crosslinkable functional group include an epoxy group, an alcoholic hydroxyl group, a phenolic hydroxyl group, and a carboxyl group.
- a carboxyl group is preferable.
- the carboxyl group can be introduced into the polymer chain by using acrylic acid.
- a (meth) acrylic copolymer having a carboxyl group examples thereof include a (meth) acrylic acid ester copolymer having a carboxyl group and an acrylic rubber having a carboxyl group. It can. Of these, (meth) acrylic acid ester copolymers having a carboxyl group are preferred.
- the acrylic rubber has an acrylic ester as a main component, and examples thereof include rubber made of butyl acrylate and / or a copolymer of ethyl acrylate and acrylonitrile.
- the glass transition temperature (hereinafter referred to as “Tg”) of the high molecular weight component is preferably ⁇ 50 ° C. to 50 ° C., and more preferably ⁇ 30 ° C. to 20 ° C.
- Tg glass transition temperature
- Glass transition temperature refers to a value measured using a DSC (thermal differential scanning calorimeter) (for example, “Thermo Plus 2” manufactured by Rigaku Corporation).
- the weight average molecular weight of the high molecular weight component is not particularly limited, but is preferably 100,000 to 1,200,000, more preferably 200,000 to 1,000,000. When the weight average molecular weight of the high molecular weight component is in such a range, it becomes easy to ensure film forming properties and fluidity.
- the weight average molecular weight is a polystyrene conversion value using a standard polystyrene calibration curve by gel permeation chromatography (GPC).
- the silicone-modified resin used in this embodiment is not particularly limited as long as it is a resin modified with silicone.
- silicone-modified resin a silicone-modified alkyd resin is preferable.
- the temporary fixing film contains the silicone-modified alkyd resin
- the temporary fixing film can be easily peeled off without using a solvent when the film is temporarily peeled off from the semiconductor wafer.
- a method for obtaining a silicone-modified alkyd resin for example, (i) a normal synthesis reaction for obtaining an alkyd resin, that is, when reacting a polyhydric alcohol with a fatty acid, a polybasic acid, etc., the organopolysiloxane is simultaneously reacted as an alcohol component. And (ii) a method of reacting a general alkyd resin synthesized in advance with an organopolysiloxane.
- Examples of the polyhydric alcohol used as a raw material for the alkyd resin include dihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, trimethylene glycol, tetramethylene glycol, and neopentyl glycol, glycerin, trimethylolethane, Examples thereof include trihydric alcohols such as trimethylolpropane, and tetrahydric or higher polyhydric alcohols such as diglycerin, triglycerin, pentaerythritol, dipentaerythritol, mannitol, and sorbit. These may be used individually by 1 type and may be used in combination of 2 or more type.
- polybasic acid used as a raw material for the alkyd resin examples include aromatic polybasic acids such as phthalic anhydride, terephthalic acid, isophthalic acid, and trimetic anhydride, and aliphatic saturated polybasic acids such as succinic acid, adipic acid, and sebacic acid.
- Aliphatic unsaturated polybasic acids such as basic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, citraconic anhydride, cyclopentadiene-maleic anhydride adduct, terpene-maleic anhydride adduct, rosin-maleic anhydride
- polybasic acids by Diels-Alder reaction such as acid adducts. These may be used individually by 1 type and may be used in combination of 2 or more type.
- the alkyd resin may further contain a modifying agent or a crosslinking agent.
- the modifier examples include octylic acid, lauric acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linoleic acid, eleostearic acid, ricinoleic acid, dehydrated ricinoleic acid, or coconut oil, linseed oil, kiri oil, castor Oil, dehydrated castor oil, soybean oil, safflower oil, and these fatty acids can be used. These may be used individually by 1 type and may be used in combination of 2 or more type.
- crosslinking agent examples include amino resins such as melamine resins and urea resins, urethane resins, epoxy resins, and phenol resins. Among these, when an amino resin is used, an amino alkyd resin crosslinked with an amino resin is preferably obtained.
- a crosslinking agent may be used individually by 1 type, and may be used in combination of 2 or more type.
- an acidic catalyst can be used as a curing catalyst.
- an acidic catalyst It can select suitably from well-known acidic catalysts as a crosslinking reaction catalyst of an alkyd resin, and can use it.
- an acidic catalyst for example, an organic acidic catalyst such as p-toluenesulfonic acid and methanesulfonic acid is suitable.
- An acidic catalyst may be used individually by 1 type, and may be used in combination of 2 or more type.
- silicone-modified alkyd resin examples include Tesfine TA31-209E (trade name, manufactured by Hitachi Chemical Co., Ltd.).
- a combination of a silicone-modified alkyd resin and a polyether-modified silicone, an alkyl-modified silicone, an epoxy-modified silicone, etc. from the viewpoint of easy peeling.
- silicones as described above include SH3773M, L-7001, SH-550, SH-710 manufactured by Toray Dow Corning Co., Ltd., X-22-163, KF-105, X-manufactured by Shin-Etsu Silicone Co., Ltd. 22-163B, X-22-163C and the like, but there is no particular limitation as long as it is compatible with the high molecular weight substance.
- the blending amount of the (B) silicone-modified resin in the temporary fixing film according to this embodiment is preferably 1 to 100 parts by mass, more preferably 10 to 80 parts by mass with respect to 100 parts by mass of the (A) high molecular weight component. .
- (B) When the compounding quantity of a silicone modified resin exists in the said range, it becomes possible to make compatible the adhesiveness at the time of semiconductor wafer processing, and the peelability after a process. Moreover, it is preferable that the compounding quantity of (B) silicone modified resin is 30 mass parts or more with respect to 100 mass parts of (A) high molecular weight component.
- the film for temporary fixing according to the present embodiment can contain (C) a curing accelerator and other components as required in addition to (A) a high molecular weight component and (B) a silicone-modified resin.
- curing accelerator examples include imidazoles, dicyandiamide derivatives, dicarboxylic acid dihydrazide, triphenylphosphine, tetraphenylphosphonium tetraphenylborate, 2-ethyl-4-methylimidazole-tetraphenylborate, 1,8-diazabicyclo. [5,4,0] undecene-7-tetraphenylborate and the like. These can be used alone or in combination of two or more.
- the film for temporary fixing according to the present embodiment contains a (meth) acrylic copolymer having a carboxyl group, it is preferable to contain a curing accelerator that accelerates curing of an epoxy group contained in the acrylic copolymer. .
- the amount of curing accelerator added is too small, it may be difficult to completely cure the temporary fixing film due to the heat history in the manufacturing process of the semiconductor element, and the semiconductor wafer and the support may not be securely fixed. There is.
- the addition amount of the curing accelerator is too large, not only does the melt viscosity of the temporary fixing film easily increase due to heating during the production process, but the storage stability of the film tends to deteriorate.
- the blending amount of the (C) curing accelerator in the temporary fixing film according to this embodiment is preferably 0.01 to 2.0 parts by mass with respect to 100 parts by mass of the (A) high molecular weight component. Yes.
- Other components include inorganic fillers.
- an inorganic filler it is preferable to mix
- blend 10 it is preferable to blend 10 to 100 parts by mass of an inorganic filler with respect to 100 parts by mass of the high molecular weight component.
- the temporary fixing film according to the present embodiment can contain a coupling agent from the viewpoint of heat resistance.
- the coupling agent include ⁇ -ureidopropyltriethoxysilane, ⁇ -mercaptopropyltrimethoxysilane, 3-phenylaminopropyltrimethoxysilane, 3- (2-aminoethyl) aminopropyltrimethoxysilane, and the like.
- the temporary fixing film according to the present embodiment can contain a thermosetting resin such as an epoxy resin, a phenol resin, or a bismaleimide resin.
- a thermosetting resin such as an epoxy resin, a phenol resin, or a bismaleimide resin.
- the film for temporary fixing preferably has an elastic modulus of 0.1 to 1000 MPa at 23 ° C. after being heated at 110 ° C. for 30 minutes and 170 ° C. for 1 hour. If the elastic modulus at 23 ° C. is 0.1 MPa or more, the film becomes soft and the possibility of adhesive residue occurring on the semiconductor wafer during the peeling process can be reduced.
- the elastic modulus at 23 ° C. is 1000 MPa or less. If it exists, it will become easy to peel from the semiconductor wafer which has unevenness
- Elastic modulus means a measured value when measured using a dynamic viscoelasticity measuring device (manufactured by UBM Co., Ltd.) while increasing the temperature at a rate of temperature increase of 3 ° C./min.
- the film for temporary fixing preferably has a melt viscosity before curing of 15000 Pa ⁇ s or less at 120 ° C.
- the melt viscosity at 120 ° C. is 15000 Pa ⁇ s or less, for example, a semiconductor wafer without generating voids under the conditions of 70 to 150 ° C./0.02 to 0.2 MPa / 1 to 5 minutes / 5 to 15 mbar. It is possible to crimp to. Further, when the melt viscosity at 120 ° C. is 15000 Pa ⁇ s or less, sufficient fluidity can be obtained when the semiconductor wafer is vacuum-bonded under the above conditions, and the generation of voids can be suppressed.
- melt viscosity is a measured value when measured using ARES (manufactured by Rheometric Scientific) and increasing the temperature at a rate of temperature increase of 20 ° C./min while applying 5% strain to the temporary fixing film. Means.
- the film thickness of the temporary fixing film according to this embodiment is preferably 10 to 150 ⁇ m from the viewpoint of ensuring the function of temporary fixing and sufficiently filling irregularities such as bumps of the semiconductor wafer.
- the film thickness is 10 ⁇ m or more, it is excellent in sufficiently embedding bumps and the like, and when it is 150 ⁇ m or less, it is economical.
- the thickness is preferably 15 to 150 ⁇ m, more preferably 30 to 110 ⁇ m, from the viewpoint of sufficiently embedding the bumps.
- the thickness is preferably 10 to 30 ⁇ m, more preferably 10 to 20 ⁇ m from the economical viewpoint.
- the temporary fixing film according to the present embodiment preferably has a 30 ° peel strength between the temporary fixing film and a semiconductor wafer (for example, a silicon wafer) of 300 N / m or less. In this case, when the semiconductor wafer and the temporary fixing film are peeled off, it becomes easy to prevent the semiconductor wafer from being cracked.
- a semiconductor wafer for example, a silicon wafer
- the film for temporary fixing according to the present embodiment can be produced from a varnish of a film-forming composition for temporary fixing including the above-described components.
- the (A) high molecular weight component and the (B) silicone-modified resin and, if necessary, other additions such as the (C) curing accelerator, the inorganic filler, and the coupling agent.
- the components are mixed and kneaded in an organic solvent to prepare a varnish.
- a layer of the varnish is formed by applying the obtained varnish on the base film.
- the base film is removed to obtain a temporary fixing film.
- the above mixing and kneading can be performed by appropriately combining these using a normal stirrer, a raking machine, a three-roller, a ball mill or the like.
- the heat drying is not particularly limited as long as the solvent used is sufficiently volatilized, but it can be performed by heating at 60 to 200 ° C. for 0.1 to 90 minutes.
- the base film is not particularly limited, and examples thereof include a polyester film, a polypropylene film, a polyethylene terephthalate film, a polyimide film, a polyetherimide film, a polyether naphthalate film, and a methylpentene film.
- the organic solvent is not particularly limited as long as it can uniformly dissolve, knead or disperse the above components, and a conventionally known organic solvent can be used.
- a solvent include ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone, dimethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone, toluene, xylene, and the like. It is preferable to use methyl ethyl ketone, cyclohexanone, etc. in terms of fast drying speed and low price.
- FIG. 1A is a top view showing an embodiment of a resin film sheet for temporary fixing according to this embodiment
- FIG. 1B is a schematic cross-sectional view taken along the line II in FIG. 1A. It is.
- the temporary fixing film sheet 1 shown in FIG. 1 is a support film 10 having releasability, a temporary fixing film 20 provided on the supporting film 10, and a side opposite to the supporting film 10 of the temporary fixing film 20. And a protective film 30 provided on the surface.
- the support film 10 is not particularly limited, and examples thereof include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, polyamide, and polyimide.
- polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polypropylene, polyamide, and polyimide are preferable from the viewpoints of flexibility and toughness.
- the thickness of the support film 10 may be appropriately changed depending on the intended flexibility, but is preferably 3 to 250 ⁇ m. If it is 3 ⁇ m or more, the film strength is sufficient, and if it is 250 ⁇ m or less, sufficient flexibility is obtained. From such a viewpoint, the thickness of the support film 10 is more preferably 5 to 200 ⁇ m, and particularly preferably 7 to 150 ⁇ m.
- the thickness of the temporary fixing film 20 of the present embodiment is preferably 10 to 150 ⁇ m from the viewpoint of ensuring the function of temporary fixing and sufficiently filling irregularities such as bumps of the semiconductor wafer.
- the film thickness is 10 ⁇ m or more, it is excellent in sufficiently embedding bumps and the like, and when it is 150 ⁇ m or less, it is economical.
- the thickness is preferably 15 to 150 ⁇ m, more preferably 30 to 110 ⁇ m, from the viewpoint of sufficiently embedding the bumps.
- the thickness is preferably 10 to 30 ⁇ m, more preferably 10 to 20 ⁇ m from the economical viewpoint.
- a previously formed film having a thickness of 100 ⁇ m or less may be bonded.
- the residual solvent when producing a thick film can be reduced.
- the protective film 30 is not particularly limited, and examples thereof include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene, and polypropylene. Among these, polyethylene terephthalate, polyethylene, and polypropylene are preferable from the viewpoints of flexibility and toughness. Moreover, it is preferable to use as a protective film the film in which mold release processing was given by the silicone type compound, the fluorine type compound, etc. from a viewpoint of peelability improvement with the film for temporary fixing (resin layer).
- the thickness of the protective film 30 can be appropriately set depending on the intended flexibility, but is preferably 10 to 250 ⁇ m. If it is 10 ⁇ m or more, the film strength is sufficient, and if it is 250 ⁇ m or less, sufficient flexibility is obtained. From such a viewpoint, the thickness of the protective film 30 is more preferably 15 to 200 ⁇ m, and particularly preferably 20 to 150 ⁇ m.
- FIG. 2A is a top view showing another embodiment of the film sheet for temporary fixing according to the present invention
- FIG. 2B is a schematic cross-sectional view taken along the line II-II in FIG. It is.
- the temporarily fixing film sheet 2 shown in FIG. 2 has the same configuration as the temporarily fixing film sheet 1 except that the temporarily fixing film 20 and the protective film 30 are cut in advance according to the shape of the temporarily fixed member.
- the outer edges of the temporarily fixed film 20 and the protective film 30 that have been cut are removed, but the temporary fixing film and the protective film are provided with cuts in accordance with the shape of the temporarily fixed member. The outer edge may be left.
- the semiconductor wafer processing method according to the present embodiment is roughly divided into the following four steps.
- FIGS. 3A, 3B, and 3C are schematic cross-sectional views for explaining one embodiment of a method for processing a semiconductor wafer
- FIG. 3D is a semiconductor after processing. It is a top view which shows a wafer.
- FIG. 3A shows a process of temporarily fixing the semiconductor wafer 60 to the support 50 by interposing the temporary fixing film 40 according to the present embodiment between the support 50 and the semiconductor wafer 60.
- the thickness of the semiconductor wafer 60 is not particularly limited, but can be 600 to 800 ⁇ m.
- a temporary fixing film is pasted on a circular support made of glass or a wafer. After pasting, the temporary fixing film is cut into a circle according to the shape of the support. At this time, it is preferable to set the shape to be cut in accordance with the shape of the semiconductor wafer to be processed. Moreover, you may affix the film for temporary fixing on the semiconductor wafer side to process instead of a support body.
- a support provided with a temporary fixing film is set on a vacuum press or a vacuum laminator, and the semiconductor wafer is pressed and pasted with a press.
- a temporary fixing film is provided on the semiconductor wafer side
- a wafer on which the temporary fixing film is bonded is set on a vacuum press or a vacuum laminator, and the support is pressed and pasted with a press.
- the temporary fixing film 40 is interposed between the support 50 and the semiconductor wafer 60 to temporarily fix the semiconductor wafer 60 to the support 50.
- the pressure is 1 hPa or less, the pressure is 1 MPa, the pressure is 60 ° C. to 200 ° C., the holding time is 100 seconds to 300 seconds.
- the wafer 60 and the support body 50 are temporarily fixed via the temporary fixing film 40.
- a vacuum laminator for example, a vacuum laminator LM-50 ⁇ 50-S (trade name) manufactured by NPC Corporation, or a vacuum laminator V130 (trade name) manufactured by Nichigo Morton Co., Ltd. is used, and the pressure is 1 hPa or less.
- the semiconductor wafer 60 and the support 50 are temporarily fixed via the temporary fixing film 40.
- the temporary fixing film 40 is thermally cured by heating.
- the thermosetting conditions include heating at 110 ° C. for 30 minutes and subsequently heating at 170 ° C. for 1 hour.
- the support of this embodiment may be subjected to a peeling process, and the peeling layer 52 is formed by peeling all or part of the surface of the support 50 as shown in FIG.
- the release agent used for the release treatment is not particularly limited.
- a surface modifier having a fluorine element, a polyolefin wax and silicone oil, a silicone oil containing a reactive group, and a silicone-modified alkyd resin have excellent release properties. Therefore, it is preferable.
- the semiconductor wafer can be processed at a high temperature using the support, and the temporary fixing film is peeled off from the semiconductor wafer and the support without any adhesive residue after processing. can do.
- the processing steps include grinding, electrode formation, metal wiring formation, protective film formation and the like used at the wafer level.
- a well-known grinding system can be utilized.
- the grinding is preferably performed while cooling the semiconductor wafer and a grindstone (such as diamond) with water.
- the back surface of the semiconductor wafer 80 that is, the surface of the semiconductor wafer 80 opposite to the side in contact with the temporary fixing film 70 is ground by a grinder 90, and the thickness is about 725 ⁇ m, for example. Thinning to 100 ⁇ m or less.
- DGP-8761 (trade name) manufactured by DISCO Corporation can be cited, and the cutting conditions in this case can be arbitrarily selected according to the desired thickness and grinding state of the semiconductor wafer.
- other processes include metal sputtering for forming electrodes, etc., wet etching for etching metal sputtering layers, application of resist for masking the formation of metal wiring, pattern formation by exposure / development, resist coating
- Known processes such as peeling, dry etching, formation of metal plating, silicon etching for TSV formation, and formation of an oxide film on the silicon surface can be mentioned.
- the back surface of the thinned semiconductor wafer 80 is subjected to processing such as dry ion etching or Bosch process, through holes are formed, and then processing such as copper plating is performed to form through electrodes 82.
- processing such as dry ion etching or Bosch process
- through holes are formed, and then processing such as copper plating is performed to form through electrodes 82.
- An example is shown.
- FIG. 3D is a top view of the semiconductor wafer 80 after processing.
- a thick film semiconductor wafer in which a through electrode is prepared in advance is prepared, a temporary fixing film is provided on the circuit surface of the wafer, and the back surface of the semiconductor wafer (in this embodiment, the wiring pattern of the semiconductor wafer is provided by a grinder).
- the thickness of about 700 ⁇ m can be reduced to 100 ⁇ m or less.
- the thinned semiconductor wafer is etched to cue the through electrode, thereby forming a passivation film.
- the copper electrode is cueed again by ion etching or the like to form a circuit.
- a semiconductor wafer thus processed can be obtained.
- FIG. 4 is a schematic cross-sectional view for explaining an embodiment of a separation process for separating a processed semiconductor wafer from a support and a temporary fixing film.
- the separation process according to this embodiment includes a first peeling process for peeling the semiconductor wafer from the support and a second peeling process for peeling the temporarily fixing film from the semiconductor wafer.
- the first peeling step is a step of peeling the semiconductor wafer processed in the processing step from the support, that is, a step of peeling the thinned semiconductor wafer from the support before dicing after various processing. It is.
- the peeling method mainly a method of separating the two by sliding in the opposite direction along the horizontal direction while heating (preferably 200 to 250 ° C.) the semiconductor wafer and the support, A method in which one side of the support is fixed horizontally and the other side is lifted at a certain angle from the horizontal direction, and a protective film is attached to the ground surface of the ground semiconductor wafer, and the semiconductor wafer and the protective film are peeled off.
- the method of peeling from a support body etc. is mentioned by a system, It can employ
- one of the support semiconductor wafer 80 and the support 50 as shown in FIG. 4A is fixed horizontally, and the other is fixed.
- a method of lifting at a certain angle from the horizontal direction, a method of attaching a protective film to the ground surface of the ground semiconductor wafer, and peeling the semiconductor wafer and the protective film by a peel method are more suitable.
- These peeling methods are usually carried out at room temperature, but may be carried out at a temperature that does not damage the semiconductor wafer at about 40 to 100 ° C.
- a De-Bonding device EVG805EZD manufactured by EVG is used.
- the semiconductor wafer 80 and the support 50 are separated from each other by, for example, installing a jig having a key shape on the interface between the temporary fixing film and the semiconductor wafer and applying an upward stress. Can do.
- the semiconductor wafer 80 is fixed horizontally, and the end of the temporary fixing film 70 is lifted at a certain angle from the horizontal direction.
- the semiconductor wafer 80 from which the temporarily fixing film is peeled can be obtained (see FIG. 4C).
- the temporary fixing film according to the present embodiment a processed semiconductor wafer in which residues such as adhesive residue are sufficiently reduced can be easily obtained.
- separation may be performed between the semiconductor wafer and the film-like temporary fixing material in the first peeling step.
- ⁇ (D) Cleaning step> A part of the temporarily fixed material tends to remain on the circuit forming surface of the semiconductor wafer.
- a cleaning step for removing the temporary fixing material can be provided.
- the temporary fixing material can be removed, for example, by washing the semiconductor wafer.
- the cleaning solution used is not particularly limited as long as it is a cleaning solution that can remove the partially remaining temporary fixing material, and examples thereof include the organic solvents that can be used for dilution of the temporary fixing resin composition. These organic solvents can be used individually by 1 type or in combination of 2 or more types.
- bases and acids may be added to the organic solvent.
- bases examples include amines such as ethanolamine, diethanolamine, triethanolamine, triethylamine, and ammonia; and ammonium salts such as tetramethylammonium hydroxide.
- acids organic acids such as acetic acid, oxalic acid, benzenesulfonic acid, and dodecylbenzenesulfonic acid can be used.
- the addition amount is preferably 0.01 to 10% by mass in terms of the concentration in the cleaning solution.
- an existing surfactant may be added.
- the cleaning method is not particularly limited, and examples thereof include a method of cleaning with a paddle using the cleaning liquid, a cleaning method by spraying, and a method of immersing in a cleaning liquid tank.
- the temperature is preferably 10 to 80 ° C., and preferably 15 to 65 ° C.
- a thin semiconductor wafer 80 is obtained by washing with water or alcohol and drying.
- the processed semiconductor wafer 80 has through electrodes 82 formed in the same manner as described above, and is further separated into semiconductor elements by dicing along a dicing line 84.
- a semiconductor device can be manufactured by connecting the obtained semiconductor element to another semiconductor element or a semiconductor element mounting substrate.
- FIG. 5 is a schematic cross-sectional view for explaining an embodiment of a method for manufacturing a semiconductor device.
- the semiconductor element 100 in which the through electrode 86 is formed and separated into pieces by the above-described method is prepared (FIG. 5A).
- a semiconductor device 120 can be obtained by stacking a plurality of semiconductor elements 100 over the wiring substrate 110 (FIG. 5B).
- Examples 1 to 5 and Comparative Examples 1 and 2 Cyclohexanone was added to a composition having the composition shown in Table 1 or 2 (components and composition ratio (unit: part by mass)), and the mixture was stirred and mixed to obtain a varnish.
- the obtained varnish was filtered through a 100 mesh filter and vacuum degassed.
- the varnish after vacuum defoaming was applied onto a polyethylene terephthalate (PET) film that had been subjected to a release treatment with a thickness of 38 ⁇ m.
- PET polyethylene terephthalate
- the applied varnish was heat-dried in two stages of 90 ° C. for 5 minutes, followed by 140 ° C. for 5 minutes.
- a temporarily fixing film sheet provided with a 40 ⁇ m-thick temporary fixing film in a B-stage state on a PET film as a support film was obtained.
- the temporary fixing material surface of the obtained temporary fixing film sheet was bonded to a polyethylene (PE) film to form a three-layer structure, thereby preventing foreign matter from adhering to the temporarily fixing material surface.
- HTR-860P-30B (acrylic rubber, sample name, Teikoku Chemical Industry Co., Ltd., weight average molecular weight 250,000, Tg: 12 ° C.).
- HTR-280-CHN (acrylic rubber, sample name, Teikoku Chemical Industry Co., Ltd., weight average molecular weight 900,000, Tg: -28 ° C).
- HTR-280-CHN Rev. 17 (acrylic rubber, sample name, Teikoku Chemical Industry Co., Ltd., weight average molecular weight 900,000, Tg: ⁇ 10 ° C.).
- Curezol 2PZ-CN (trade name, 1-cyanoethyl-2-phenylimidazole manufactured by Shikoku Kasei Kogyo Co., Ltd.).
- a varnish for forming a film was prepared by dissolving and mixing the polyimide resin PI-1 in an NMP solvent so that the solid content concentration was 50% by mass. Using this varnish, a temporary fixing film sheet was obtained in the same manner as described above.
- the melt viscosity of the temporarily fixing film was evaluated by the following method.
- the temporary fixing film (thickness 40 ⁇ m) obtained above was roll-laminated at 80 ° C., and four films were stacked to obtain a temporary fixing film having a thickness of 160 ⁇ m. This was punched out to a 10 mm square in the thickness direction to obtain a quadrangular laminate having a 10 mm square and a thickness of 160 ⁇ m.
- a circular aluminum plate jig having a diameter of 8 mm was set in a dynamic viscoelastic device ARES (manufactured by Rheometric Scientific), and a laminated body of temporary fixing films punched out was set here. Then, it measured while heating up to 150 degreeC by the temperature increase rate of 20 degree-C / min, giving 5% distortion at 35 degreeC, and recorded the melt viscosity in 120 degreeC.
- the step embedding property of the film adhesive was evaluated by the following method.
- the temporary fixing film (thickness 40 ⁇ m) obtained above was roll-laminated at 80 ° C., and two films were stacked to obtain a temporary fixing film having a thickness of 80 ⁇ m.
- grooves having a width of 40 ⁇ m and a depth of 40 ⁇ m were formed at intervals of 100 ⁇ m on the surface of a 625 ⁇ m thick silicon mirror wafer (6 inches) by blade dicing.
- the stepped silicon mirror wafer thus produced was placed on the stage of a vacuum laminator (manufactured by NPC Corporation, LM-50X50-S) so that the level difference is on the upper surface.
- the fixing film was placed so as to stick to the stepped silicon mirror wafer side, and vacuum laminated at 15 mbar at 120 ° C./0.1 MPa / 2 minutes. A cross section of the obtained sample was observed, and the embedding property of the groove produced by blade dicing was evaluated.
- the evaluation criteria for embeddability are as follows. ⁇ : Void ratio is less than 5%. X: Void ratio is 5% or more.
- the heat resistance at 200 ° C. of the temporarily fixing film was evaluated by the following method.
- a 625 ⁇ m thick silicon mirror wafer (6 inches) was cut into 25 mm square pieces by blade dicing. It roll-laminated at 80 degreeC so that the film for temporary fixing might stick on the silicon mirror wafer surface cut into pieces.
- a slide glass having a thickness of 0.1 to 0.2 mm and a size of about 18 mm square was roll-laminated at 80 ° C. on the temporary fixing film, and the temporary fixing film was sandwiched between the silicon wafer and the slide glass.
- a laminate was produced.
- the obtained sample was heated at 110 ° C. for 30 minutes, then heated at 170 ° C. for 1 hour to cure the temporary fixing film, and then heated at 200 ° C. for 30 minutes.
- the sample obtained in this way is observed from the slide glass surface, the image is analyzed with a soft wafer such as Photoshop (registered trademark), and the heat resistance at 200 ° C. is determined from the proportion of voids in the total area of the temporary fixing film. Evaluated.
- the evaluation criteria are as follows. ⁇ : Void ratio is less than 5%. X: Void ratio is 5% or more.
- the tensile modulus after curing of the temporary fixing film was evaluated by the following method.
- the temporary fixing film (40 ⁇ m thickness) obtained above was roll-laminated at 80 ° C., and three films were stacked to obtain a temporary fixing film having a thickness of 120 ⁇ m. After heating in an oven at 110 ° C. for 30 minutes and further at 170 ° C. for 1 hour, it was cut into a width of 4 mm and a length of 33 mm.
- the support film of the temporarily fixing film sheet was peeled off.
- the obtained sample was set in a dynamic viscoelastic device (product name: Rheogel-E4000, manufactured by UMB Co., Ltd.), applied with a tensile load, measured at a frequency of 10 Hz, and a heating rate of 3 ° C./min, and 23 ° C. The measured value at was recorded.
- a dynamic viscoelastic device product name: Rheogel-E4000, manufactured by UMB Co., Ltd.
- the 30 ° peel strength between the silicon wafer and the temporary fixing film was evaluated by the following method. Grooves having a width of 40 ⁇ m and a depth of 40 ⁇ m were formed at 100 ⁇ m intervals on the surface of a 625 ⁇ m thick silicon mirror wafer (6 inches) by blade dicing.
- the stepped silicon mirror wafer thus produced was placed on the stage of a vacuum laminator (manufactured by NPC Corporation, LM-50X50-S) so that the level difference is on the upper surface.
- the fixing film was placed so as to stick to the stepped silicon mirror wafer side, and vacuum laminated at 15 mbar at 120 ° C./0.1 MPa / 2 minutes. The obtained sample was heated at 110 ° C.
- the peelability of the temporary fixing film with a debonding apparatus was evaluated by the following method.
- the temporary fixing film (thickness 40 ⁇ m) obtained above and a support film (thickness 60 ⁇ m) were roll-laminated at 80 ° C. to obtain a film having a thickness of 100 ⁇ m.
- the film obtained above is attached by roll lamination at 80 ° C. so that the temporary fixing film side is attached to the silicon mirror wafer side.
- the temporary fixing film side is attached to the silicon mirror wafer side.
- a silicon mirror wafer 8 inches having a thickness of 725 ⁇ m
- grooves having a width of 40 ⁇ m and a depth of 40 ⁇ m were formed at intervals of 100 ⁇ m by blade dicing, and a silicon wafer having a step on the surface was prepared.
- the step side of the silicon wafer and the temporary fixing film side of the support with the temporary fixing film obtained above were 120 ° C./0.1 MPa / 5 with a vacuum bonding apparatus (VE07-14 manufactured by Ayumi Industry Co., Ltd.).
- the laminated body thus obtained was heated at 110 ° C. for 30 minutes, and subsequently heated at 170 ° C. for 1 hour to cure the temporary fixing film, and then heated at 200 ° C. for 30 minutes.
- Sharp tweezers were inserted between the stepped side of the silicon wafer and the temporary fixing film, and the tweezers were moved along the outer edge.
- the case where the silicon wafer and the support were able to be peeled without cracking was marked with ⁇ , and the case where the silicon wafer and the support could not be peeled or where damage was observed was marked with x.
- the temporary fixing films of Examples 1 to 5 are excellent in step embedding and heat resistance of the silicon wafer and have a low elastic modulus after curing, and are used for temporary fixing to the silicon wafer. It was confirmed that the 30 ° peel strength between the film and the film was low, and the peelability from the silicon wafer was good.
- DESCRIPTION OF SYMBOLS 1 ... Film sheet for temporarily fixing, 2 ... Film sheet for temporarily fixing, 10 ... Support film, 20 ... Film for temporarily fixing, 30 ... Protective film, 40 ... Film for temporarily fixing, 50 ... Support body, 52 ... Release layer, DESCRIPTION OF SYMBOLS 60 ... Semiconductor wafer, 70 ... Temporary fixing film, 80 ... Semiconductor wafer, 82 ... Through electrode, 84 ... Dicing line, 86 ... Through electrode, 100 ... Semiconductor element, 110 ... Wiring board, 120 ... Semiconductor device.
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Abstract
Description
本実施形態に係る仮固定用フィルムは、半導体ウェハを支持体に仮固定用フィルムを介して仮固定する仮固定工程と、支持体に仮固定された半導体ウェハを加工する加工工程と、加工された半導体ウェハを支持体及び仮固定用フィルムから分離する分離工程と、を備える半導体ウェハの加工方法に用いられる仮固定用フィルムであって、(A)高分子量成分及び(B)シリコーン変性樹脂を含有し、110℃で30分間及び170℃で1時間加熱された後の弾性率が23℃において0.1~1000MPaであることを特徴とする。
本実施形態に係る半導体ウェハの加工方法は、大きく分けて以下の4工程からなる。(a)半導体ウェハと支持体とを仮固定用フィルムを介して仮固定する仮固定工程と、(b)支持体に仮固定された半導体ウェハを加工する加工工程と、(c)加工された半導体ウェハを支持体及び仮固定用フィルムから分離する分離工程と、(d)半導体ウェハに残渣がある場合に洗浄する洗浄工程とからなる。
図3の(A)は、支持体50及び半導体ウェハ60の間に、本実施形態に係る仮固定用フィルム40を介在させ、支持体50に半導体ウェハ60を仮固定する工程を示す。
加工工程には、ウェハレベルで用いられる研削、電極形成、金属配線形成、保護膜形成などが含まれる。研削方式には特に制限はなく、公知の研削方式が利用できる。研削は半導体ウェハと砥石(ダイヤモンドなど)とに水をかけて冷却しながら行うことが好ましい。
図4は、加工された半導体ウェハを支持体及び仮固定用フィルムから分離する分離工程の一実施形態を説明するための模式断面図である。本実施形態に係る分離工程は、支持体から半導体ウェハを剥離する第一の剥離工程と、半導体ウェハから仮固定用フィルムを剥離する第二の剥離工程と、を含む。第一の剥離工程は、加工工程で加工を施した半導体ウェハを支持体から剥離する工程、即ち、薄型化した半導体ウェハに様々な加工を施した後、ダイシングする前に支持体から剥離する工程である。剥離方法としては、主に半導体ウェハと支持体とを加熱(好ましくは200~250℃)しながら、水平方向に沿って反対方向にスライドさせることにより両者を分離する方法、支持体の半導体ウェハ又は支持体の一方を水平に固定しておき、他方を水平方向から一定の角度を付けて持ち上げる方法、及び、研削された半導体ウェハの研削面に保護フィルムを貼り、半導体ウェハと保護フィルムとをピール方式で支持体から剥離する方法等が挙げられるが、特に制限なく採用することができる。
半導体ウェハの回路形成面は仮固定材の一部が残存しやすい。剥離した半導体ウェハの回路形成面に仮固定材が一部残存した場合、これを除去するための洗浄工程を設けることができる。仮固定材の除去は、例えば、半導体ウェハを洗浄することにより行うことができる。
表1又は表2に示す組成(成分及び組成比(単位:質量部))を有する組成物に、シクロヘキサノンを加え、撹拌混合してワニスを得た。
(高分子量成分)
HTR-860P-30B:(アクリルゴム、帝国化学産業株式会社製サンプル名、重量平均分子量25万、Tg:12℃)。
HTR-280-CHN:(アクリルゴム、帝国化学産業株式会社製サンプル名、重量平均分子量90万、Tg:-28℃)。
HTR-280-CHN 改17:(アクリルゴム、帝国化学産業株式会社製サンプル名、重量平均分子量90万、Tg:-10℃)。
TA31-209E: (日立化成ポリマー(株)製商品名、シリコーン変性アルキッド樹脂)
KF-105: (信越シリコーン株式会社製商品名、エポキシ変性シリコーン)
SH-550: (東レ・ダウコーニング株式会社製商品名、メチルフェニルシリコーン)
SH3773M: (東レ・ダウコーニング株式会社製商品名、ポリエーテル変性シリコーン)
キュアゾール2PZ-CN:(四国化成工業株式会社製商品名、1-シアノエチル-2-フェニルイミダゾール)。
[ポリイミド樹脂PI-1の合成]
撹拌機、温度計、窒素置換装置(窒素流入管)、及び水分受容器付きの還流冷却器を備えたフラスコ内に、ジアミンである、BAPP(商品名、東京化成製、2,2-ビス[4-(4-アミノフェノキシ)フェニル]プロパン)、分子量410.51)を10.26g(0.025mol)及び1,4-ブタンジオール ビス(3-アミノプロピル)エーテル(東京化成製、商品名:B-12、分子量:204.31)5.10g(0.025mol)と、溶媒である、N-メチル-2-ピロリドン(NMP)100gとを仕込み、撹拌してジアミンを溶媒に溶解させた。上記フラスコを氷浴中で冷却しながら、デカメチレンビストリメリテート酸二無水物(DBTA)26.11g(0.05mol)を、フラスコ内の溶液に少量ずつ添加した。添加終了後、窒素ガスを吹き込みながら溶液を180℃に昇温させて5時間保温し、ポリイミド樹脂PI-1を得た。ポリイミド樹脂PI-1の重量平均分子量は50000、Tgは70℃であった。
上記で得られた実施例1~5、比較例1~3の仮固定用フィルムシートについて、以下に示す方法にしたがって、溶融粘度、段差埋込性、200℃での耐熱性評価、硬化後の弾性率、30°剥離強度、及び剥離性をそれぞれ評価した。結果を表3及び4に示す。
仮固定用フィルムの溶融粘度を下記の方法により評価した。
上記で得られた仮固定用フィルム(厚み40μm)を80℃でロールラミネートし、4枚重ねることで、厚み160μmの仮固定用フィルムを得た。これを、厚み方向に10mm角に打ち抜くことで、10mm角、厚み160μmの四角形の積層体を得た。動的粘弾性装置ARES(レオメトリック・サイエンティフィック社製)に直径8mmの円形アルミプレート治具をセットし、更にここに打ち抜いた仮固定用フィルムの積層体をセットした。その後、35℃で5%の歪みを与えながら20℃/分の昇温速度で150℃まで昇温させながら測定し、120℃での溶融粘度を記録した。
フィルム状粘着剤の段差埋込性を下記の方法により評価した。
上記で得られた仮固定用フィルム(厚み40μm)を80℃でロールラミネートし、2枚重ねることで、厚み80μmの仮固定用フィルムを得た。次に、厚み625μmシリコンミラーウェハ(6インチ)表面に、ブレードダイシングにより幅40μm、深さ40μmの溝を100μm間隔で作製した。このようにして作製した段差付きシリコンミラーウェハの段差が上面となるように真空ラミネーター((株)エヌ・ピー・シー製、LM-50X50-S)のステージ上に置き、上記で得られた仮固定用フィルムを段差付きシリコンミラーウェハ側に貼り付くように設置し、120℃/0.1MPa/2分、15mbarで真空ラミネートした。得られたサンプルを断面観察し、ブレードダイシングで作製した溝の埋込性を評価した。埋込性の評価基準は以下の通りである。
○:ボイドの割合が5%未満。
×:ボイドの割合が5%以上。
仮固定用フィルムの200℃での耐熱性を下記の方法により評価した。
厚み625μmシリコンミラーウェハ(6インチ)をブレードダイシングにより25mm角に小片化した。小片化したシリコンミラーウェハ表面に、仮固定用フィルムが貼り付くように80℃でロールラミネートした。次に、仮固定用フィルム上に厚みが0.1~0.2mmで大きさが約18mm角のスライドガラスを80℃でロールラミネートし、仮固定用フィルムがシリコンウェハとスライドガラスで挟まれた積層品を作製した。得られたサンプルを110℃で30分間加熱し、続いて170℃で1時間加熱して仮固定用フィルムを硬化させ、その後、200℃で30分間加熱した。
○:ボイドの割合が5%未満。
×:ボイドの割合が5%以上。
仮固定用フィルムの硬化後の引っ張り弾性率を下記の方法により評価した。
上記で得られた仮固定用フィルム(厚み各40μm)を80℃でロールラミネートし、3枚重ねることで、厚み120μmの仮固定用フィルムを得た。110℃のオーブンで30分、さらに170℃で1時間加熱した後、厚み方向に4mm幅、長さ33mmに切り出した。なお、仮固定用フィルムシートの支持フィルムは剥離除去した。得られたサンプルを動的粘弾性装置(製品名:Rheogel-E4000、(株)UMB製)にセットし、引張り荷重をかけて、周波数10Hz、昇温速度3℃/分で測定し、23℃での測定値を記録した。
シリコンウェハ及び仮固定用フィルムの間の30°剥離強度を下記の方法により評価した。
厚み625μmシリコンミラーウェハ(6インチ)表面に、ブレードダイシングにより幅40μm、深さ40μmの溝を100μm間隔で作製した。このようにして作製した段差付きシリコンミラーウェハの段差が上面となるように真空ラミネーター((株)エヌ・ピー・シー製、LM-50X50-S)のステージ上に置き、上記で得られた仮固定用フィルムを段差付きシリコンミラーウェハ側に貼り付くように設置し、120℃/0.1MPa/2分、15mbarで真空ラミネートした。得られたサンプルを110℃で30分間加熱し、続いて170℃で1時間加熱して硬化させ、その後、200℃で30分間加熱した後、10mm幅に切り出した。これを、剥離角度が30°となるように設定した剥離試験機で300mm/分の速度で剥離試験を実施し、そのときの剥離強度を記録した。
仮固定用フィルムのデボンド装置での剥離性を下記の方法により評価した。
上記で得られた仮固定用フィルム(厚み40μm)と支持フィルム(厚み60μm)とを80℃でロールラミネートし、厚み100μmのフィルムを得た。
Claims (9)
- 半導体ウェハを支持体に仮固定用フィルムを介して仮固定する仮固定工程と、前記支持体に仮固定された前記半導体ウェハを加工する加工工程と、加工された前記半導体ウェハを前記支持体及び前記仮固定用フィルムから分離する分離工程と、を備える半導体ウェハの加工方法に用いられる前記仮固定用フィルムであって、
(A)高分子量成分及び(B)シリコーン変性樹脂を含有し、110℃で30分間及び170℃で1時間加熱された後の弾性率が23℃において0.1~1000MPaである、仮固定用フィルム。 - 前記(A)高分子量成分が、ガラス転移温度が-50℃~50℃であり、重量平均分子量が10万~120万である架橋性官能基を有する(メタ)アクリル共重合体を含む、請求項1に記載の仮固定用フィルム。
- 前記(B)シリコーン変性樹脂が、シリコーン変性アルキド樹脂を含む、請求項1又は2に記載の仮固定用フィルム。
- 前記(B)シリコーン変性樹脂の含有量が、前記(A)高分子量成分100質量部に対して、1~100質量部である、請求項1~3のいずれか一項に記載の仮固定用フィルム。
- (C)硬化促進剤を更に含有する、請求項1~4のいずれか一項に記載の仮固定用フィルム。
- 硬化前の溶融粘度が120℃において15000Pa・s以下であり、且つ、厚さが10~150nmである、請求項1~5のいずれか一項に記載の仮固定用フィルム。
- 半導体ウェハと仮固定用フィルムとの間の30°剥離強度が300N/m以下である、請求項1~6のいずれか一項に記載の仮固定用フィルム。
- 離型性を有する支持フィルムと、該支持フィルム上に設けられた、請求項1~7のいずれか一項に記載の仮固定用フィルムと、を備える、仮固定用フィルムシート。
- 請求項1~7のいずれか一項に記載の仮固定用フィルム又は請求項8に記載の仮固定用フィルムシートを用いて加工された半導体ウェハから得られる半導体素子を備える、半導体装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/107,985 US10550295B2 (en) | 2013-12-26 | 2014-12-24 | Film for temporary fixing, film sheet for temporary fixing and semiconductor device |
CN201480070497.2A CN105849215B (zh) | 2013-12-26 | 2014-12-24 | 临时固定用膜、临时固定用膜片材及半导体装置 |
JP2015554949A JP6443343B2 (ja) | 2013-12-26 | 2014-12-24 | 仮固定用フィルム、仮固定用フィルムシート及び半導体装置 |
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KR20160103010A (ko) | 2016-08-31 |
JP6443343B2 (ja) | 2018-12-26 |
TW201533788A (zh) | 2015-09-01 |
US10550295B2 (en) | 2020-02-04 |
JPWO2015098949A1 (ja) | 2017-03-23 |
KR102239643B1 (ko) | 2021-04-12 |
US20160326409A1 (en) | 2016-11-10 |
TWI668748B (zh) | 2019-08-11 |
CN105849215B (zh) | 2019-09-03 |
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