WO2010103903A1 - スペーサ形成用フィルム、半導体ウエハーおよび半導体装置 - Google Patents
スペーサ形成用フィルム、半導体ウエハーおよび半導体装置 Download PDFInfo
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- WO2010103903A1 WO2010103903A1 PCT/JP2010/052503 JP2010052503W WO2010103903A1 WO 2010103903 A1 WO2010103903 A1 WO 2010103903A1 JP 2010052503 W JP2010052503 W JP 2010052503W WO 2010103903 A1 WO2010103903 A1 WO 2010103903A1
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14683—Processes or apparatus peculiar to the manufacture or treatment of these devices or parts thereof
- H01L27/14685—Process for coatings or optical elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24752—Laterally noncoextensive components
Definitions
- the present invention relates to a film for forming a spacer, a semiconductor wafer, and a semiconductor device.
- a semiconductor device represented by a CMOS sensor, a CCD sensor, or the like comprising: a semiconductor substrate having a light receiving portion; a spacer provided on the semiconductor substrate; and a transparent substrate bonded to the semiconductor substrate through the spacer.
- a semiconductor device having the same is known.
- Such a photosensitive film includes a sheet base material and an adhesive layer (spacer forming layer), and an adhesive layer (spacer forming layer) is usually provided on the entire surface of the sheet base material.
- the photosensitive film is cut into a size equivalent to that of a semiconductor wafer or the like, and then the cut-out photosensitive film is bonded to a semiconductor wafer or the like.
- the conventional photosensitive film is provided with the adhesive layer on the entire surface of the sheet base material, when the film is cut out as described above, a part of the adhesive layer adheres to the blade used for the cutting. There was a problem. This deposit adheres to the edge of the photosensitive film when the next photosensitive film is cut out, and adheres to the surface of the photosensitive film when laminating the semiconductor wafer and the photosensitive film. It was. The adhered matter on the surface becomes a factor that hinders exposure when the adhesive layer is exposed. As a result, there is a problem that patterning cannot be performed with sufficient accuracy, and productivity of the semiconductor device is lowered.
- An object of the present invention is to provide a film for forming a spacer which is excellent in patterning property at the time of exposure, and part of a spacer forming layer is difficult to adhere to a blade at the time of cutting, and which is excellent in productivity of a semiconductor device. It is an object of the present invention to provide a semiconductor wafer excellent in device productivity and a semiconductor device manufactured using such a semiconductor wafer.
- a spacer forming film that is used to form a spacer for forming a void on one side of a semiconductor wafer, and is used by cutting it into a predetermined shape, A sheet-like support substrate; A spacer-forming layer provided on the support substrate and having adhesiveness;
- the spacer forming layer is made of a material containing an alkali-soluble resin, a thermosetting resin, and a photopolymerization initiator,
- the spacer forming film is characterized in that the edge of the spacer forming layer is formed inside the cut line without intersecting the cut line at the time of the cut.
- the planar shape of the spacer forming layer is a substantially circular shape having a diameter X
- the cut-out line has a diameter Y and a substantially circular shape arranged concentrically with a circle formed by an edge of the spacer forming layer.
- the diameter X and the diameter Y are 0.80 ⁇ X / Y ⁇ The film for spacer formation as described in (1) above, which satisfies a relationship of 1.00.
- the cut line has a substantially circular shape
- the diameter of the circle formed by the cut line is Y [cm]
- the diameter of the semiconductor wafer to which the spacer forming layer is bonded is Z [cm]
- the relationship of 0.85 ⁇ Y / Z ⁇ 1.15 is established.
- the planar shape of the spacer forming layer is a substantially circular shape having a diameter X, and when the diameter of the semiconductor wafer to which the spacer forming layer is bonded is Z [cm], 0.80 ⁇ X /
- the distance between the edge of the spacer forming layer and the cut line at the position where the edge of the spacer forming layer and the cut line are closest to each other is 10 to 20000 ⁇ m (1) to (4) The film for spacer formation according to any one of the above.
- a semiconductor wafer wherein the spacer forming film obtained by cutting out the spacer forming film according to any one of (1) to (7) above by the cut line is attached.
- FIG. 1 is a cross-sectional view illustrating an example of a semiconductor device.
- FIG. 2 is a cross-sectional view showing a preferred embodiment of the spacer forming film of the present invention.
- FIG. 3 is a plan view showing a preferred embodiment of the spacer forming film of the present invention.
- FIG. 4 is a process diagram showing an example of a semiconductor device manufacturing method.
- FIG. 5 is a plan view of the joined body obtained in the manufacturing process of the semiconductor device.
- FIG. 1 is a cross-sectional view showing an example of a semiconductor device (light receiving device) according to the present embodiment.
- a semiconductor device (light receiving device) 100 includes a base substrate 101, a transparent substrate 102, a light receiving unit 103 including a light receiving element, and a spacer 104 formed so as to surround the light receiving unit 103.
- the base substrate 101 is a semiconductor substrate, and on the base substrate 101, for example, a microlens array (not shown) is formed.
- the transparent substrate 102 is disposed so as to face the base substrate 101 and has substantially the same planar dimension as that of the base substrate 101.
- the transparent substrate 102 is, for example, an acrylic resin, a polyethylene terephthalate resin (PET), a glass substrate, or the like.
- the spacer 104 is directly bonded to the microlens array on the base substrate 101 and the transparent substrate 102, and bonds the base substrate 101 and the transparent substrate 102 together.
- the spacer 104 forms a gap 105 between the base substrate 101 and the transparent substrate 102.
- the spacer 104 is disposed so as to surround the center portion of the microlens array of the base substrate 101, and a portion of the microlens array surrounded by the spacer 104 functions as the light receiving unit 103.
- a photoelectric conversion unit (not shown) is formed on the lower surface of the light receiving unit 103, that is, the base substrate 101, and the light received by the light receiving unit 103 is converted into an electric signal.
- a light receiving element such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS) is formed.
- CCD charge coupled device
- CMOS complementary metal oxide semiconductor
- the semiconductor device manufactured using the spacer forming film of the present invention is not limited to the light receiving device as described above.
- a pressure sensor, an acceleration sensor, a printer head, an optical scanner, a flow path module, etc. Can be applied.
- the spacer forming film of the present invention is used for forming the spacer in the production of the semiconductor device as described above.
- the film for forming a spacer of the present invention is used by cutting into an arbitrary shape in the manufacture of a semiconductor device as described above, and then sticking to one side of a semiconductor wafer.
- FIG. 2 is a sectional view showing a preferred embodiment of the spacer forming film of the present invention
- FIG. 3 is a plan view showing a preferred embodiment of the spacer forming film of the present invention.
- the spacer-forming film 1 has a support base 11 and a spacer-forming layer 12 provided on the support base 11. Further, the spacer forming film 1 is cut out by a cutting line 111 as shown in FIG. 2 and used for manufacturing the semiconductor device 100 as described above.
- the support substrate 11 is a sheet-like substrate and has a function of supporting the spacer forming layer 12.
- the support base 11 is preferably made of a light transmissive material.
- exposure of the spacer formation layer 12 can be performed through the support base material 11 in manufacture of a semiconductor device which is mentioned later.
- the spacer forming layer 12 can be reliably exposed while effectively preventing dust and the like from adhering to the spacer forming layer 12 effectively. Further, it is possible to prevent a mask used for exposure from adhering to the spacer formation layer 12.
- Examples of the material constituting the support base 11 include polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE). Among these, it is preferable to use polyethylene terephthalate (PET) from the viewpoint of excellent balance between light transmittance and breaking strength.
- PET polyethylene terephthalate
- PP polypropylene
- PE polyethylene
- the spacer forming layer 12 is a layer that has adhesiveness to the surface of a semiconductor wafer or a transparent substrate described later, and is adhered to the semiconductor wafer or a transparent substrate described later.
- the semiconductor wafer generally has a substantially circular shape, and has a notch called an orientation flat or notch for indicating the directionality of the semiconductor wafer.
- planar shape of the spacer forming layer 12 is substantially circular as shown in FIG.
- the edge of the spacer forming layer is formed on the inner side of the cut line without intersecting with the cut line at the time of cutting.
- the cut line 111 is set so as to surround the edge of the spacer forming layer.
- the cut line 111 has a substantially circular shape, and the circle formed by the cut line and the circle formed by the edge of the spacer forming layer 12 are arranged concentrically, and the spacer forming layer The diameter of the circle formed by the 12 edges is smaller than the diameter of the circle formed by the cut line.
- the circle formed by the edge of the spacer forming layer 12 and the circle formed by the cut line is formed by the diameter of the circle formed by the edge of the spacer forming layer 12 X [cm] and the cut line 111.
- the diameter of the circle is Y [cm]
- the patterning property at the time of exposure can be made more excellent, and the productivity of the semiconductor device can be made higher.
- the diameter of the circle formed by the cut line 111 is Y [cm] and the diameter of the semiconductor wafer to which the spacer forming layer 12 is bonded is Z [cm], 0.85 ⁇ Y / Z ⁇ 1.15. It is preferable to satisfy this relationship, and it is more preferable to satisfy the relationship of 0.90 ⁇ Y / Z ⁇ 1.10.
- Y / Z is less than the lower limit value, the area of the spacer forming layer 12 adhered to the semiconductor wafer becomes small, and the semiconductor wafer may not be sufficiently effectively used for manufacturing a semiconductor device.
- the spacer forming layer 12 protrudes from between the semiconductor wafer and the spacer forming film 1 when the semiconductor wafer and the spacer forming film 1 are bonded together. In some cases, the yield of the semiconductor device decreases.
- the diameter of the circle formed by the edge of the spacer forming layer 12 is X [cm] and the diameter of the semiconductor wafer to which the spacer forming layer 12 is bonded is Z [cm], 0.80 ⁇ X / Z ⁇ 1 It is preferable that the relationship of 0.00 is satisfied, and it is more preferable that the relationship of 0.85 ⁇ X / Z ⁇ 1.00 is satisfied.
- X / Z is less than the lower limit, the area of the spacer forming layer 12 adhered to the semiconductor wafer becomes small, and the semiconductor wafer may not be sufficiently effectively used for manufacturing a semiconductor device.
- the spacer forming layer 12 is exposed to light of all wavelengths with a mercury lamp, and the elastic modulus at 80 ° C. after exposure so that the integrated exposure amount becomes 700 mJ / cm 2 with i-line (365 nm) light.
- the elastic modulus of the spacer forming layer 12 when measured under the following conditions (1) to (3) is preferably 500 Pa or more, more preferably 1,000 Pa or more, and 5,000 Pa or more. Further preferred. When the elastic modulus is within the above range, the shape retention of the spacer of the semiconductor device can be made particularly excellent.
- the upper limit of the elastic modulus is not particularly limited, but is preferably 200,000 Pa or less, and particularly preferably 150,000 Pa or less. If the upper limit of the elastic modulus exceeds the above range, stress relaxation may not be sufficient, and the reliability of the semiconductor device may be reduced.
- the elastic modulus can be evaluated by, for example, a dynamic viscoelasticity measuring device Rheo Stress RS150 (manufactured by HAAKE). Specifically, after a spacer forming layer 12 having a film thickness of 50 ⁇ m is formed on a polyester film having a size of 250 mm ⁇ 200 mm, three samples cut to a size of 30 mm ⁇ 30 mm are prepared. Each sample is irradiated with light using a mercury lamp, and the spacer forming layer 12 is photocured.
- the exposure amount is 700 mJ / cm 2 with light having a wavelength of 365 nm.
- the photocured spacer forming layer 12 is peeled from the polyester film, and three sheets are stacked and set in the above-described dynamic viscoelasticity measuring apparatus.
- the gap between the cone plates on which the sample was set was set to 100 ⁇ m (three resin layers described above were stacked and pressed between the plates to be 100 ⁇ m).
- the measurement conditions were a frequency of 1 Hz, a temperature increase rate of 10 ° C./min, and a temperature range of room temperature to 250 ° C.
- the elastic modulus at a temperature at which the transparent substrate is pressure-bonded, and it is generally in a temperature range of 80 to 180 ° C.
- the shape retention of the resin spacer is excellent when the elastic modulus measured at 130 ° C., which is the average value of the temperature range, is within the range.
- the reason why the thickness of the spacer formation layer 12 is set to 100 ⁇ m is preferably evaluated by the same thickness as that of the spacer formation layer 12 that is originally used, but the thickness of the spacer formation layer 12 is small. Since the stability of the result of the elastic modulus may be insufficient, the elastic modulus was evaluated as 100 ⁇ m.
- the elastic modulus obtained by the actual thickness of the spacer forming layer 12 and the elastic modulus of the spacer forming layer 12 having the thickness of 100 ⁇ m described above are substantially the same.
- the reason for irradiating the ultraviolet rays at 700 is to sufficiently cure the spacer forming layer 12.
- the exposure amount is adjusted as appropriate.
- the average thickness of the spacer forming layer 12 is preferably 10 to 300 ⁇ m, and more preferably 15 to 250 ⁇ m. Thereby, the thickness of the formed semiconductor device can be made sufficiently thin while the size of the gap between the semiconductor wafer and the transparent substrate is made sufficient.
- the spacer forming layer 12 as described above is a layer having photocurability, alkali developability and thermosetting, and is a material (resin composition) containing an alkali-soluble resin, a thermosetting resin, and a photopolymerization initiator. ).
- resin composition constituting the spacer forming layer 12 will be described in detail.
- the resin composition constituting the spacer forming layer 12 contains an alkali-soluble resin. Thereby, the spacer formation layer 12 has alkali developability.
- alkali-soluble resin examples include (meth) acryl-modified novolak resin such as (meth) acryl-modified bis A novolak resin, acrylic resin, copolymer of styrene and acrylic acid, polymer of hydroxystyrene, polyvinylphenol, poly Examples include ⁇ -methylvinylphenol, among which alkali-soluble novolak resins are preferable, and (meth) acryl-modified novolak resins are particularly preferable.
- novolak resin such as (meth) acryl-modified bis A novolak resin, acrylic resin, copolymer of styrene and acrylic acid, polymer of hydroxystyrene, polyvinylphenol, poly Examples include ⁇ -methylvinylphenol, among which alkali-soluble novolak resins are preferable, and (meth) acryl-modified novolak resins are particularly preferable.
- the content of the alkali-soluble resin is not particularly limited, but is preferably 50 to 95% by weight of the entire resin composition constituting the spacer forming layer 12. If the content of the alkali-soluble resin is less than the lower limit, the compatibility with other resins in the resin composition may be lowered. Moreover, when content of alkali-soluble resin exceeds the said upper limit, developability or resolution may fall.
- the resin composition constituting the spacer forming layer 12 includes a thermosetting resin.
- the spacer formation layer 12 has adhesiveness even after exposure and development. That is, after bonding the spacer forming layer 12 and the semiconductor wafer, exposing and developing, the transparent substrate can be thermocompression bonded to the spacer forming layer 12.
- thermosetting resin examples include phenol novolak resins, cresol novolak resins, novolac type phenol resins such as bisphenol A novolak resin, phenol resins such as resol phenol resin, bisphenol type epoxy such as bisphenol A epoxy resin and bisphenol F epoxy resin.
- Resin novolak epoxy resin, cresol novolac epoxy resin, etc., novolak epoxy resin, biphenyl epoxy resin, stilbene epoxy resin, triphenolmethane epoxy resin, alkyl-modified triphenolmethane epoxy resin, epoxy resin containing triazine nucleus Epoxy resins such as cyclopentadiene-modified phenolic epoxy resins, resins with triazine rings such as urea (urea) resins and melamine resins, unsaturated Examples include reester resin, bismaleimide resin, polyurethane resin, diallyl phthalate resin, silicone resin, resin having a benzoxazine ring, cyanate ester resin, epoxy-modified siloxane, and the like. Use one or a combination of two or more of these. Can do. Among these, it is particularly preferable to use an epoxy resin. Thereby, heat resistance and adhesiveness with a transparent substrate can be improved more.
- an epoxy resin that is solid at room temperature particularly a bisphenol type epoxy resin
- an epoxy resin that is liquid at room temperature particularly a silicone-modified epoxy resin that is liquid at room temperature
- the content of the thermosetting resin is not particularly limited, but is preferably 10 to 40% by weight, and more preferably 15 to 35% by weight of the entire resin composition constituting the spacer forming layer 12. If the content of the thermosetting resin is less than the lower limit, the effect of improving heat resistance may be reduced. Moreover, when content of a thermosetting resin exceeds the said upper limit, the effect which improves the toughness of the spacer formation layer 12 may fall.
- the thermosetting resin preferably further contains a phenol novolac resin in addition to the epoxy resin as described above.
- the developability can be improved by adding a phenol novolac resin.
- the thermosetting property of the epoxy resin can be improved, and the strength of the formed spacer can be further improved.
- the resin composition constituting the spacer forming layer 12 contains a photopolymerization initiator. Thereby, the spacer formation layer 12 can be efficiently patterned by photopolymerization.
- photopolymerization initiator examples include benzophenone, acetophenone, benzoin, benzoin isobutyl ether, methyl benzoin benzoate, benzoin benzoic acid, benzoin methyl ether, benzylfinyl sulfide, benzyl, dibenzyl, diacetyl, benzyldimethyl ketal, and the like. .
- the content of the photopolymerization initiator is not particularly limited, but is preferably 0.5 to 5% by weight, and preferably 0.8 to 3.0% by weight based on the entire resin composition constituting the spacer forming layer 12. Is more preferable. If the content of the photopolymerization initiator is less than the lower limit, the effect of initiating photopolymerization may not be sufficiently obtained. Moreover, when content of a photoinitiator exceeds the said upper limit, reactivity will become high and a preservability and resolution may fall.
- the resin composition constituting the spacer forming layer 12 may contain a photopolymerizable resin in addition to the above components.
- the photopolymerizable resin for example, an acrylic polyfunctional monomer is used.
- the polyfunctional monomer means a monomer having three or more functions.
- a trifunctional or tetrafunctional acrylate compound can be particularly preferably used.
- the strength of the spacer 104 to be formed may not be sufficient, and the shape of the semiconductor device 100 may not be sufficiently retained.
- an acrylic polyfunctional monomer for example, trifunctional (meth) acrylate such as trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, ditrile
- examples include tetrafunctional (meth) acrylates such as methylolpropane tetra (meth) acrylate and hexafunctional (meth) acrylates such as dipentaerythritol hexa (meth) acrylate.
- the resin composition constituting the spacer forming layer 12 contains an acrylic polyfunctional monomer
- its content is preferably 1 to 50% by weight of the entire resin composition, and is 5% to 25% by weight. Is more preferable. Thereby, the intensity
- the photopolymerizable resin may contain an epoxy vinyl ester resin.
- Epoxy vinyl ester resins include 2-hydroxy-3-phenoxypropyl acrylate, Epolite 40E methacrylic adduct, Epolite 70P acrylic acid adduct, Epolite 200P acrylic acid adduct, Epolite 80MF acrylic acid adduct, Epolite 3002 methacrylic acid adduct.
- the content thereof is not particularly limited, but is preferably 3 to 30% by weight of the total resin composition, and 5% to 15%. More preferably, it is% by weight. Thereby, after sticking, the foreign material which remain
- the resin composition which comprises the spacer formation layer 12 you may contain an inorganic filler, however, It is preferable to set it as 9 weight% or less of the whole resin composition. If the content of the inorganic filler exceeds the upper limit, foreign matter due to the inorganic filler may adhere to the semiconductor wafer after development or undercut may occur. When the resin component as described above is included, the inorganic filler may not be included.
- inorganic fillers include fibrous fillers such as alumina fibers and glass fibers, acicular fillers such as potassium titanate, wollastonite, aluminum borate, acicular magnesium hydroxide, whiskers, talc, mica, and seric. Sites, glass flakes, flake graphite, plate-like fillers such as plate-like calcium carbonate, spherical fillers such as calcium carbonate, silica, fused silica, fired clay and unfired clay, porous materials such as zeolite and silica gel A filler etc. are mentioned. These may be used alone or in combination of two or more. Among these, it is preferable to use a porous filler.
- the average particle diameter of the inorganic filler is not particularly limited, but is preferably 0.01 to 90 ⁇ m, and particularly preferably 0.1 to 40 ⁇ m. If the average particle diameter exceeds the above upper limit value, the appearance of the spacer forming film 1 may be abnormal or the resolution may be poor. Further, if the average particle size is less than the lower limit, there may be a poor adhesion during heat pasting.
- the average particle diameter can be evaluated using, for example, a laser diffraction particle size distribution analyzer SALD-7000 (manufactured by Shimadzu Corporation).
- the inorganic filler a porous filler may be used.
- the average pore diameter of the porous filler is preferably 0.1 to 5 nm, particularly preferably 0.3 to 1 nm.
- the resin composition constituting the spacer forming layer 12 can contain additives such as a plastic resin, a leveling agent, an antifoaming agent, and a coupling agent within the range not impairing the object of the present invention in addition to the above-described components. .
- Such a film 1 for spacer formation forms, for example, a coating film composed of the resin composition described above on the entire surface of the support substrate 11, and then the spacer formation layer 12 inside the set cut line. It may be formed by cutting out the part to be formed and removing the part other than the part, or may be formed by applying the above-described resin composition inside the cut line set by the support base 11. Good.
- FIG. 4 is a process diagram illustrating an example of a method for manufacturing a semiconductor device
- FIG. 5 is a plan view of a joined body obtained in the process of manufacturing the semiconductor device.
- the spacer forming film 1 according to the present invention as described above is prepared, and the spacer forming film 1 is cut out using a cutting roll along a cutting line 111 as shown in FIG. 3 (cutting process). .
- the spacer forming layer 12 is formed on the inner side of the cut line 111 without the edge of the spacer forming layer 12 intersecting the cut line 111. For this reason, since a part of the spacer forming layer 12 does not adhere to the blade of the cutting cutter, when the other spacer forming film 1 is continuously cut out, the spacer forming layer is formed on the surface of the spacer forming film 1. A part of 12 does not adhere.
- a semiconductor wafer 101 ' having a plurality of light receiving portions 103 and a microlens array (not shown) formed on the functional surface is prepared (see FIG. 4A).
- the functional surface of the semiconductor wafer 101 ′ and the spacer forming layer 12 (adhesion surface) of the cut-out spacer forming film 1 are bonded together (laminating step).
- a semiconductor wafer 101 '(semiconductor wafer of the present invention) to which the spacer forming film 1 cut by the cut line is attached is obtained.
- the spacer forming layer 12 is exposed to light (ultraviolet rays) and exposed (exposure process).
- the mask 20 is used to selectively irradiate the site to be the spacer. Thereby, the part irradiated with light among the spacer formation layers 12 is photocured.
- the exposure of the spacer forming layer 12 is performed through the support base 11 as shown in FIG. Thereby, the spacer forming layer 12 can be reliably exposed while effectively preventing dust and the like from adhering to the spacer forming layer 12 effectively. Further, it is possible to prevent the mask 20 from adhering to the spacer formation layer 12 during exposure.
- the spacer forming layer 12 is developed using an alkaline aqueous solution, whereby the uncured portion of the spacer forming layer 12 is removed. Then, the photocured portion remains as the spacer 104 ′ (development process). In other words, portions 105 ′ that form a plurality of gaps between the semiconductor wafer and the transparent substrate are formed.
- thermocompression bonding thermocompression step
- thermocompression bonding is preferably performed within a temperature range of 80 to 180 ° C. Thereby, the shape of the spacer 104 to be formed can be improved.
- the obtained bonded body 1000 is divided according to the light receiving unit (dicing step, see FIG. 4F). Specifically, first, a cut 21 is made by a dicing saw from the semiconductor wafer 101 ′ side. Next, a metal film (not shown) is formed by sputtering or the like so as to cover the inner wall surface of the cut 21 and the surface of the semiconductor wafer 101 ′ opposite to the transparent substrate 102 ′. After that, a cut 21 is made by a dicing saw from the transparent substrate 102 ′ side, and the joined body 1000 is divided according to the light receiving unit.
- the semiconductor device 100 shown in FIG. 1 can be obtained.
- the wiring and a metal film (not shown) on the back surface of the base substrate 101 are electrically connected to each other on the substrate on which the wiring is patterned through solder bumps. Mounted on.
- the spacer forming film has been described as having a support base material and a spacer forming layer, but the present invention is not limited to this.
- the protective film any material can be used as long as it is excellent in breaking strength, flexibility, etc., and has good peelability from the adhesive surface.
- PET polyethylene terephthalate
- PP polypropylene
- PE polyethylene
- the protective film may be formed from an opaque material.
- the shape formed by the cut line and the shape formed by the edge of the adhesion surface of the spacer forming layer are described as circular, but the present invention is not limited to this.
- the distance between the edge of the adhesion surface of the spacer formation layer and the cut line 111 at the position where the edge of the adhesion surface of the spacer formation layer and the cut line are closest is 10 to 20000 ⁇ m.
- the thickness is preferably 100 to 10,000 ⁇ m. Thereby, it can prevent more reliably that a part of spacer formation layer adheres to the blade used for cutting. As a result, the productivity of the semiconductor device can be increased.
- the spacer forming layer is exposed through the support base material.
- the spacer formation layer may be exposed after the support base material is removed.
- resin varnish of resin composition constituting spacer forming layer As photopolymerizable resin, trimethylolpropane trimethacrylate (manufactured by Kyoeisha Chemical Co., Ltd., light ester TMP) 15% by weight, epoxy vinyl ester resin (Kyoeisha Chemical Co., Ltd.) ), Epoxy ester 3002 methacrylic acid adduct) 5% by weight, epoxy resin as thermosetting resin, cresol novolac type epoxy resin (manufactured by Nippon Kayaku Co., Ltd., EOCN-1020-70) 5% by weight, bisphenol A Type epoxy resin (Japan Epoxy Resin Co., Ltd., Ep-1001) 10% by weight, silicone epoxy resin (Toray Dow Corning Silicone Co., Ltd., BY16-115) 5% by weight, phenol novolac resin (Sumitomo Bakelite ( Co., Ltd., PR53647) 3% by weight, Arca Weighed 55% by weight of the above (
- the resin varnish prepared as described above is applied to the polyester film as a supporting substrate with a comma coater (manufactured by Yasui Seiki Co., Ltd., model number: MFG No. 194001 type 3-293), thereby being composed of a resin varnish.
- a coating film was formed on the entire supporting substrate.
- a cut line having a circular shape with a diameter of 20 cm is set on the support substrate, and the shape of the coating film in plan view is determined by a die-cut system (manufactured by Fuji Shoko Co., Ltd., model number: DL-500W). It was pre-cut so as to be concentric with a circle composed of a cut line in a circle having a diameter of 18 cm. Then, the inner part cut
- the average thickness of the spacer forming layer was 50 ⁇ m, and the diameter of the circle formed by the edge of the adhesion surface of the spacer forming layer was 18 cm.
- Example 2 Except for adjusting the diameter of the circle formed by the set cut line and the diameter of the circle formed by the edge of the adhesion surface of the spacer forming layer to be the values shown in Table 1, the same as in Example 1 above. Thus, a spacer forming film was produced.
- Example 6 A spacer-forming film was produced in the same manner as in Example 5 except that the compounding ratio of each component of the resin composition constituting the spacer-forming layer was changed as shown in Table 1.
- Table 1 shows the types and amounts of components of the resin composition of the spacer forming layer, the diameter of the cut line, the diameter of the circle formed by the edge of the adhesion surface of the spacer forming layer, and the like in each example and comparative example.
- methacryloyl-modified novolak bisphenol A resin is “MPN”
- trimethylolpropane trimethacrylate is “TMP”
- epoxy vinyl ester resin is “3002”
- cresol type novolac type epoxy resin is “EOCN”
- bisphenol A type bisphenol A type.
- the epoxy resin was indicated as “Ep”, the silicone epoxy resin as “BY16”, and the phenol novolac resin as “PR”.
- an 8-inch semiconductor wafer (base substrate) manufactured by SUMCO Corporation, product number: PW, diameter: 20.3 cm, thickness: 725 ⁇ m
- a pre-cut product of a spacer forming film is laminated under the conditions of a roll laminator (roll temperature: 60 ° C., speed: 0.3 m / min, syringe pressure: 2.0 kgf / cm 2 ), and a semiconductor wafer with a spacer forming film 50 were produced continuously.
- a fully automatic dry resist film sticking machine manufactured by Takatori Co., Ltd., product number: TEAM-100RF capable of continuously pre-cutting and laminating to a semiconductor wafer is used for the spacer forming film obtained in the comparative example. Then, 50 semiconductor wafers with spacer-forming films were produced continuously.
- an 8-inch semiconductor wafer with a spacer-forming film laminated 50th in each example and comparative example through a mask was exposed to 700 mJ / cm 2 of 365 nm light, and then exposed to a support substrate. The material was peeled off.
- TMAH tetramethylammonium hydroxide
- the shape of the spacer obtained in each Example and Comparative Example was observed with an electron microscope (x5,000 times), and the patterning property by exposure was evaluated according to the following evaluation criteria.
- ⁇ The spacers were slightly chipped and thickened, but the patterning property showed no problem in practical use.
- X There was a portion where the spacer was not formed, and the accuracy of the patterning property was low.
- the spacer forming film of the present invention was excellent in productivity of the semiconductor device without deteriorating patterning properties.
- the present invention it is possible to obtain a spacer forming film that has excellent patterning properties during exposure and excellent semiconductor device productivity. Moreover, a semiconductor wafer excellent in productivity of the semiconductor device and a semiconductor device manufactured using such a semiconductor wafer can be provided. Therefore, it has industrial applicability.
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Abstract
Description
(1) 半導体ウエハーの片面側に空隙部を形成するためのスペーサを形成するのに用いられ、所定の形状に切り抜いて使用されるスペーサ形成用フィルムであって、
シート状の支持基材と、
前記支持基材上に設けられ、接着性を有するスペーサ形成層とを有し、
前記スペーサ形成層は、アルカリ可溶性樹脂と、熱硬化性樹脂と、光重合開始剤とを含む材料で構成され、
前記スペーサ形成層は、該スペーサ形成層の縁部が、前記切り抜き時の切り抜き線と交わることなく、かつ、前記切り抜き線よりも内側に形成されていることを特徴とするスペーサ形成用フィルム。
前記切り抜き線は、直径Yで、かつ、前記スペーサ形成層の縁部がなす円と同心的に配置された略円形状をなし
前記直径Xと前記直径Yとは、0.80≦X/Y<1.00の関係を満足する上記(1)に記載のスペーサ形成用フィルム。
前記切り抜き線がなす円の直径をY[cm]、前記スペーサ形成層が接着される前記半導体ウエハーの直径をZ[cm]としたとき、0.85≦Y/Z≦1.15の関係を満足する上記(1)または(2)に記載のスペーサ形成用フィルム。
<半導体装置>
まず、本発明のスペーサ形成用フィルムの説明に先立ち、本発明のスペーサ形成用フィルムを用いて製造される半導体装置について説明する。
図1に示すように、半導体装置(受光装置)100は、ベース基板101と、透明基板102と、受光素子で構成される受光部103と、受光部103を取り囲むように形成されたスペーサ104とを有する。
次に、本発明のスペーサ形成用フィルムの好適な実施形態について説明する。
本発明のスペーサ形成用フィルムは、上述したような半導体装置の製造において、上記スペーサを形成するのに用いられるものである。また、本発明のスペーサ形成用フィルムは、上述したような半導体装置の製造において、任意の形状に切り抜かれ、その後、半導体ウエハーの片面に貼着されて使用されるものである。
図2は、本発明のスペーサ形成用フィルムの好適な実施形態を示す断面図、図3は、本発明のスペーサ形成用フィルムの好適な実施形態を示す平面図である。
この支持基材11は、光透過性を有する材料で構成されているのが好ましい。このように光透過性を有する材料で構成されていることにより、後述するような半導体装置の製造において、支持基材11を介してスペーサ形成層12の露光を行うことができる。これにより、半導体装置の製造において、スペーサ形成層12に不本意に塵等が付着するのを効果的に防止しつつ、スペーサ形成層12を確実に露光することができる。また、露光する際に使用するマスクが、スペーサ形成層12に付着することを防止できる。
(2)700(mJ/cm2)で紫外線を照射後の樹脂スペーサ用フィルム
(3)測定温度:130℃
ここで、前記弾性率は、例えば、動的粘弾性測定装置Rheo Stress RS150(HAAKE社製)で評価することができる。具体的には、250mm×200mmサイズのポリエステルフィルム上に膜厚50μmのスペーサ形成層12を形成した後、30mm×30mmサイズに切断したサンプルを3枚用意する。前記各サンプルに、水銀ランプを用いて光照射して、スペーサ形成層12を光硬化する。露光量は、波長365nmの光で700mJ/cm2とする。次に、ポリエステルフィルムから光硬化したスペーサ形成層12を剥離して、3枚重ねて上述の動的粘弾性測定装置にセットする。ここで、サンプルをセットするコーンプレート間の間隙を100μmとした(上述の樹脂層を3枚重ねて、プレート間を押圧して100μmとした)。測定条件は、周波数1Hz、昇温速度10℃/分にて、温度範囲を室温~250℃とした。
以下、スペーサ形成層12を構成する樹脂組成物について詳細に説明する。
スペーサ形成層12を構成する樹脂組成物は、アルカリ可溶性樹脂を含んでいる。これにより、スペーサ形成層12は、アルカリ現像性を有するものとなる。
スペーサ形成層12を構成する樹脂組成物は、熱硬化性樹脂を含んでいる。これにより、これにより、スペーサ形成層12は、露光、現像した後でも接着性を有するものとなる。すなわち、スペーサ形成層12と半導体ウエハーとを接合して、露光、現像した後、透明基板をスペーサ形成層12に熱圧着することができる。
スペーサ形成層12を構成する樹脂組成物は、光重合開始剤を含んでいる。これにより、光重合によりスペーサ形成層12を効率良くパターニングすることができる。
スペーサ形成層12を構成する樹脂組成物は、上記成分の他、光重合性樹脂を含んでいてもよい。
次に、上述したような半導体装置の製造方法の好適な実施形態について、添付図を参照しつつ説明する。
この際、図4(c)に示すように、マスク20を用いて、スペーサとなるべき部位に選択的に光を照射する。これにより、スペーサ形成層12のうち、光が照射された部分が光硬化する。
以上の工程により、図1に示す半導体装置100を得ることができる。
(実施例1)
1.アルカリ可溶性樹脂((メタ)アクリル変性ビスAノボラック樹脂)の合成
ノボラック型ビスフェノールA樹脂(フェノライトLF-4871、大日本インキ化学(株)製)の固形分60%MEK(メチルエチルケトン)溶液500gを、2Lフラスコ中に投入し、これに触媒としてトリブチルアミン1.5g、および重合禁止剤としてハイドロキノン0.15gを添加し、100℃に加温した。その中へ、グリシジルメタクリレート180.9gを30分間で滴下し、100℃で5時間攪拌反応させることにより、固形分74%のメタクリロイル変性ノボラック型ビスフェノールA樹脂MPN001(メタクリロイル変性率50%)を得た。
光重合性樹脂として、トリメチロールプロパントリメタクリレート(共栄社化学(株)製、ライトエステルTMP)15重量%、エポキシビニルエステル樹脂(共栄社化学(株)製、エポキシエステル3002メタクリル酸付加物)5重量%、熱硬化性樹脂としてエポキシ樹脂として、クレゾールノボラック型エポキシ樹脂(日本化薬(株)製、EOCN-1020-70)5重量%、ビスフェノールA型エポキシ樹脂(ジャパンエポキシレジン(株)製、Ep-1001)10重量%、シリコーンエポキシ樹脂(東レ・ダウコーニング・シリコーン(株)製、BY16-115)5重量%、フェノールノボラック樹脂(住友ベークライト(株)、PR53647)3重量%、アルカリ可溶性樹脂として上記(メタ)アクリル変性ビスAノボラック樹脂を固形分として55重量%、光重合開始剤(チバ・スペシャリティ・ケミカルズ(株)製、イルガキュア651)2重量%を秤量し、ディスパーザーを用い、回転数3000rpmで1時間攪拌し、樹脂ワニスを調製した。
まず、支持基材ポリエステルフィルム(三菱樹脂社製、MRX50、厚さ50μm)を用意した。
設定した切り抜き線で構成される円の直径、および、スペーサ形成層の接着面の縁部のなす円の直径が、表1に示す値となるように調整した以外は、前記実施例1と同様にしてスペーサ形成用フィルムを製造した。
スペーサ形成層を構成する樹脂組成物の各成分の配合比を表1に示すように変更した以外は、前記実施例5と同様にしてスペーサ形成用フィルムを製造した。
プリカットをしなかった以外は、前記実施例1と同様にしてスペーサ形成用フィルムを製造した。
[2-1]露光によるパターニング性の評価
各実施例毎に、スペーサ形成用フィルムを、表1に示すサイズの通り連続して切り抜き、プリカット品を50枚を積層したスペーサ形成用フィルム得た。
◎:スペーサに欠け、厚くなっている部分等が全くなく、高い精度でパターンニングされていた。
○:スペーサにわずかに欠け、厚くなっている部分等が見られるが、実用上問題のないパターンニング性を示した。
△:スペーサに欠け、厚くなっている部分等が多く、十分なパターンニング性を示すものではなかった。
×:スペーサが形成されていない部分があり、パターンニング性の精度が低かった。
上記[2-1]で得られた、スペーサと空隙部となる部位とを備えた半導体ウエハーの、スペーサおよび空隙部となる部位を電子顕微鏡(×5,000倍)で観察し、残渣の有無を以下の評価基準に従い評価した。
◎:残渣が全く確認されず、実用上全く問題ない。
○:残渣が若干確認できるが、実用上問題ないレベルである。
△:残渣が比較的多く観察され、実用レベルではない。
×:残渣が多数確認され、実用レベルではない。
これらの結果を表2に示した。
上記[2-1]で各実施例および比較例の1枚目に切り抜いたスペーサ形成用フィルムを用いて形成された、スペーサと空隙部となる部位とを備えた半導体ウエハーと、8インチ透明基板とを、サブストレート・ボンダ(ズース・マイクロテック(株)製、SB8e)にセットし、8インチ半導体ウエハーと8インチ透明基板の圧着を行い、さらに、150℃、90分の条件でポストキュアを行い、半導体ウエハーと透明基板との間に複数の空隙部を有する接合体を得た。得られた接合体を、ダイシングソーを用い、所定の大きさにダイシングし、受光装置を得た。
得られた受光装置を、-55℃で1時間、125℃で1時間処理するサイクルを繰り返す温度サイクル試験を100サイクル行い(n=10)、クラックおよび剥離の観察を実施し、以下の評価基準に従い評価した。
◎:全サンプルクラックおよび剥離がなく、実用上全く問題なし。
○:僅かなクラックおよび剥離が2個以下のサンプルで確認されるが、実用上問題なし。
△:3個以上のサンプルでクラックおよび剥離が観察され、実用レベルではない。
×:8個以上のサンプルでクラックおよび剥離が観察され、実用レベルではない。
この結果を、表2に合わせて示した。
Claims (9)
- 半導体ウエハーの片面側に空隙部を形成するためのスペーサを形成するのに用いられ、所定の形状に切り抜いて使用されるスペーサ形成用フィルムであって、
シート状の支持基材と、
前記支持基材上に設けられ、接着性を有するスペーサ形成層とを有し、
前記スペーサ形成層は、アルカリ可溶性樹脂と、熱硬化性樹脂と、光重合開始剤とを含む材料で構成され、
前記スペーサ形成層は、該スペーサ形成層の縁部が、前記切り抜き時の切り抜き線と交わることなく、かつ、前記切り抜き線よりも内側に形成されていることを特徴とするスペーサ形成用フィルム。 - 前記スペーサ形成層の平面形状は、直径Xとする略円形状をなし、
前記切り抜き線は、直径Yで、かつ、前記スペーサ形成層の縁部がなす円と同心的に配置された略円形状をなし、
前記直径Xと前記直径Yとは、0.80≦X/Y<1.00の関係を満足する請求項1に記載のスペーサ形成用フィルム。 - 前記切り抜き線は、略円形状をなし、
前記切り抜き線がなす円の直径をY[cm]、前記スペーサ形成層が接着される前記半導体ウエハーの直径をZ[cm]としたとき、0.85≦Y/Z≦1.15の関係を満足する請求項1または2に記載のスペーサ形成用フィルム。 - 前記スペーサ形成層の平面形状は、直径Xとする略円形状をなし、前記スペーサ形成層が接着される前記半導体ウエハーの直径をZ[cm]としたとき、0.80≦X/Z<1.00の関係を満足する請求項1ないし3のいずれかに記載のスペーサ形成用フィルム。
- 前記スペーサ形成層の縁部と前記切り抜き線とが最も接近した位置における、前記スペーサ形成層の縁部と前記切り抜き線との距離は、10~20000μmである請求項1ないし4のいずれかに記載のスペーサ形成用フィルム。
- 前記スペーサ形成層の平均厚さが、10~300μmである請求項1ないし5のいずれかに記載のスペーサ形成用フィルム。
- 前記スペーサ形成層を構成する材料は、光重合性樹脂を含む請求項1ないし6のいずれかに記載のスペーサ形成用フィルム。
- 請求項1ないし7のいずれかに記載のスペーサ形成用フィルムを前記切り抜き線で切り抜いた前記スペーサ形成用フィルムが貼着されたことを特徴とする半導体ウエハー。
- 請求項8の半導体ウエハーを用いて製造されたことを特徴とする半導体装置。
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JP2011503755A JPWO2010103903A1 (ja) | 2009-03-12 | 2010-02-19 | スペーサ形成用フィルム、半導体ウエハーおよび半導体装置 |
SG2011065976A SG174368A1 (en) | 2009-03-12 | 2010-02-19 | Spacer formation film, semiconductor wafer and semiconductor device |
US13/255,633 US20110316127A1 (en) | 2009-03-12 | 2010-02-19 | Spacer formation film, semiconductor wafer and semiconductor device |
CN2010800110016A CN102341908A (zh) | 2009-03-12 | 2010-02-19 | 间隔体形成用膜、半导体晶片和半导体装置 |
EP10750657A EP2408008A4 (en) | 2009-03-12 | 2010-02-19 | FOIL FOR SPACERS, SEMICONDUCTOR WAFERS AND SEMICONDUCTOR ELEMENTS |
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JP2000252384A (ja) * | 1999-02-26 | 2000-09-14 | Sumitomo Metal Mining Co Ltd | 突起電極付き配線基板への熱可塑性接着剤層形成方法 |
JP2006323089A (ja) | 2005-05-18 | 2006-11-30 | Hitachi Chem Co Ltd | 感光性樹脂組成物及びこれを用いた感光性フィルム |
WO2008146723A1 (ja) * | 2007-05-25 | 2008-12-04 | Sumitomo Bakelite Company Limited | 樹脂組成物、樹脂スペーサ用フィルムおよび半導体装置 |
WO2008155896A1 (ja) * | 2007-06-19 | 2008-12-24 | Sumitomo Bakelite Co., Ltd. | 電子装置の製造方法 |
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JP2000252384A (ja) * | 1999-02-26 | 2000-09-14 | Sumitomo Metal Mining Co Ltd | 突起電極付き配線基板への熱可塑性接着剤層形成方法 |
JP2006323089A (ja) | 2005-05-18 | 2006-11-30 | Hitachi Chem Co Ltd | 感光性樹脂組成物及びこれを用いた感光性フィルム |
WO2008146723A1 (ja) * | 2007-05-25 | 2008-12-04 | Sumitomo Bakelite Company Limited | 樹脂組成物、樹脂スペーサ用フィルムおよび半導体装置 |
WO2008155896A1 (ja) * | 2007-06-19 | 2008-12-24 | Sumitomo Bakelite Co., Ltd. | 電子装置の製造方法 |
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