WO2009119064A1 - 基板の加工方法および半導体チップの製造方法ならびに樹脂接着層付き半導体チップの製造方法 - Google Patents
基板の加工方法および半導体チップの製造方法ならびに樹脂接着層付き半導体チップの製造方法 Download PDFInfo
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- WO2009119064A1 WO2009119064A1 PCT/JP2009/001277 JP2009001277W WO2009119064A1 WO 2009119064 A1 WO2009119064 A1 WO 2009119064A1 JP 2009001277 W JP2009001277 W JP 2009001277W WO 2009119064 A1 WO2009119064 A1 WO 2009119064A1
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- Prior art keywords
- liquid repellent
- liquid
- resin
- repellent pattern
- mask
- Prior art date
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- 239000011347 resin Substances 0.000 title claims abstract description 221
- 229920005989 resin Polymers 0.000 title claims abstract description 221
- 239000004065 semiconductor Substances 0.000 title claims abstract description 215
- 238000000034 method Methods 0.000 title claims abstract description 101
- 239000012790 adhesive layer Substances 0.000 title claims description 68
- 239000000758 substrate Substances 0.000 title claims description 64
- 238000004519 manufacturing process Methods 0.000 title claims description 35
- 239000007788 liquid Substances 0.000 claims abstract description 219
- 239000005871 repellent Substances 0.000 claims abstract description 170
- 238000005530 etching Methods 0.000 claims abstract description 74
- 230000002940 repellent Effects 0.000 claims description 151
- 238000003672 processing method Methods 0.000 claims description 29
- 239000000853 adhesive Substances 0.000 claims description 26
- 230000001070 adhesive effect Effects 0.000 claims description 26
- 230000001681 protective effect Effects 0.000 claims description 20
- 238000007639 printing Methods 0.000 claims description 17
- 238000009832 plasma treatment Methods 0.000 claims description 15
- 230000015572 biosynthetic process Effects 0.000 abstract description 20
- 238000000206 photolithography Methods 0.000 abstract description 5
- 239000002904 solvent Substances 0.000 description 38
- 238000010586 diagram Methods 0.000 description 15
- 229920001187 thermosetting polymer Polymers 0.000 description 10
- 238000004380 ashing Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 229910052731 fluorine Inorganic materials 0.000 description 5
- 239000011737 fluorine Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 229910001882 dioxygen Inorganic materials 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000001020 plasma etching Methods 0.000 description 4
- 229930195734 saturated hydrocarbon Natural products 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000004528 spin coating Methods 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 3
- 239000013032 Hydrocarbon resin Substances 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 229920006270 hydrocarbon resin Polymers 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000007650 screen-printing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010023 transfer printing Methods 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 150000004292 cyclic ethers Chemical class 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000002596 lactones Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000001846 repelling effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3086—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/027—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34
- H01L21/0271—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers
- H01L21/0273—Making masks on semiconductor bodies for further photolithographic processing not provided for in group H01L21/18 or H01L21/34 comprising organic layers characterised by the treatment of photoresist layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
- H01L2224/8319—Arrangement of the layer connectors prior to mounting
- H01L2224/83191—Arrangement of the layer connectors prior to mounting wherein the layer connectors are disposed only on the semiconductor or solid-state body
Definitions
- the present invention relates to a substrate processing method for performing processing for partially removing a substrate such as a semiconductor wafer, a semiconductor chip manufacturing method to which the substrate processing method is applied, and a semiconductor chip with a resin adhesive layer. Regarding the method.
- a semiconductor device mounted on a substrate of an electronic device or the like is manufactured by dividing a semiconductor chip composed of individual semiconductor devices in which an integrated circuit is formed in a wafer state into individual pieces from a semiconductor wafer.
- plasma dicing has been proposed in which dicing for cutting a semiconductor wafer into pieces of semiconductor chips is performed by plasma etching.
- Plasma dicing is a process in which a semiconductor wafer is cut along a scribe line by etching the semiconductor wafer with plasma in a state where a portion other than the scribe line indicating the lattice-shaped division position is masked by a resist film mask. . Therefore, a step of forming a mask on the semiconductor wafer is required for plasma dicing.
- This mask formation is conventionally performed by a photolithography method in which a scribe line pattern is transferred using a photosensitive material (see Patent Document 1), or in a mask layer formed on the surface of a semiconductor wafer, the region of the scribe line is irradiated with laser light. It has been performed by a method of removing the mask by irradiation to form a mask (see Patent Document 2).
- the photolithography method is originally a method aiming at a high-precision pattern such as an integrated circuit, and it is difficult to avoid an increase in cost because a complicated process and expensive equipment are required. Further, in the mask formation with laser light, it is difficult to form a low-cost mask due to the equipment cost for laser light irradiation.
- the high cost for forming such a mask is not limited to plasma dicing, but various processes using plasma etching, such as a process of providing a through hole in a substrate, and a MEMS (microelectromechanical system) This is also common in substrate processing methods such as processing for a substrate, and further forming an integrated circuit in a transparent panel for display. JP 2004-172364 A JP 2005-191039 A
- the present invention relates to a substrate processing method capable of forming a mask for etching using plasma processing at a low cost, a semiconductor chip manufacturing method to which this substrate processing method is applied, and a semiconductor chip with a resin adhesive layer. Provide a method.
- the substrate processing method of the present invention is a substrate processing method for performing processing for partially removing the substrate by etching using plasma processing. Then, a liquid-repellent pattern forming step for forming a liquid-repellent pattern by printing a liquid-repellent liquid on a region to be removed by etching on the surface to be processed of the substrate, and a processing target surface of the substrate on which the liquid-repellent pattern is formed
- a resin film forming step of forming a resin film having a thickness larger than the thickness of the liquid repellent pattern in an area where the liquid repellent pattern is not formed and curing the resin film by etching
- the liquid repellent liquid is printed on the region to be etched on the surface to be processed to form the liquid repellent pattern, and this liquid repellent pattern is formed.
- a liquid resin is supplied to the processing target surface of the substrate on which the pattern is formed to form a resin film having a thickness greater than the thickness of the liquid repellent pattern in an area where the liquid repellent pattern is not formed.
- the semiconductor chip manufacturing method of the present invention comprises a semiconductor wafer comprising a plurality of semiconductor devices on a circuit forming surface, and a semiconductor wafer comprising individual semiconductor devices by etching a semiconductor wafer having a protective sheet for protecting the circuit forming surface attached thereto.
- a liquid-repellent liquid is applied to a region to be etched on the surface to be processed.
- a liquid-repellent pattern is formed by printing, and a liquid resin is supplied to the processing target surface of the semiconductor wafer on which the liquid-repellent pattern is formed, so that an area where the liquid-repellent pattern is not formed is larger than the thickness of the liquid-repellent pattern.
- an individual semiconductor is provided by etching a semiconductor wafer having a plurality of semiconductor devices on a circuit forming surface and a protective sheet for protecting the circuit forming surface attached thereto by plasma treatment.
- This is a method of manufacturing a semiconductor chip with a resin adhesive, which manufactures a semiconductor chip with a resin adhesive having a resin adhesive layer for die bonding on the back surface by plasma dicing divided into apparatuses.
- a liquid repellent pattern is formed by printing a liquid repellent liquid on a scribe line that is a boundary between semiconductor chips, and a liquid resin is supplied to the back surface of the semiconductor wafer on which the liquid repellent pattern is formed.
- FIG. 1A is a process explanatory diagram of the substrate processing method according to Embodiment 1 of the present invention.
- FIG. 1B is a process explanatory diagram of the substrate processing method according to Embodiment 1 of the present invention.
- FIG. 1C is a process explanatory diagram of the substrate processing method according to Embodiment 1 of the present invention.
- FIG. 1D is a process explanatory diagram of the substrate processing method according to Embodiment 1 of the present invention.
- FIG. 1E is a process explanatory diagram of the substrate processing method according to Embodiment 1 of the present invention.
- FIG. 1F is a process explanatory diagram of the substrate processing method according to Embodiment 1 of the present invention.
- FIG. 1A is a process explanatory diagram of the substrate processing method according to Embodiment 1 of the present invention.
- FIG. 1B is a process explanatory diagram of the substrate processing method according to Embodiment 1 of the present invention.
- FIG. 1C is
- FIG. 2 is a plan view of a semiconductor wafer which is a target of the substrate processing method according to the first embodiment of the present invention.
- FIG. 3 is an enlarged view of a liquid repellent pattern in the substrate processing method according to the first embodiment of the present invention.
- FIG. 4 is an enlarged cross-sectional view of a semiconductor wafer that is a target of the substrate processing method according to the first embodiment of the present invention.
- FIG. 5 is an enlarged view showing a liquid resin and a liquid repellent pattern in the substrate processing method according to the first embodiment of the present invention.
- FIG. 6 is a cross-sectional view of a resin layer and a mask in the substrate processing method according to Embodiment 1 of the present invention.
- FIG. 7A is a process explanatory diagram of the method of manufacturing the semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 7B is a process explanatory diagram of the method of manufacturing the semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 7C is a process explanatory diagram of the method of manufacturing the semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 7D is a process explanatory diagram of the method of manufacturing the semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 7E is a process explanatory diagram of the method of manufacturing the semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 7F is a process explanatory diagram of the method of manufacturing the semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 8 is an enlarged view of a liquid repellent pattern in the method of manufacturing a semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 9 is an enlarged cross-sectional view of a semiconductor wafer that is a target of plasma dicing in the method of manufacturing a semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 10A is a process explanatory diagram showing a bonding method for a semiconductor chip with a resin adhesive manufactured by the method for manufacturing a semiconductor chip with a resin adhesive according to Embodiment 2 of the present invention.
- FIG. 10B is a process explanatory diagram illustrating a method for bonding a semiconductor chip with a resin adhesive manufactured by the method for manufacturing a semiconductor chip with a resin adhesive according to Embodiment 2 of the present invention.
- FIG. 10C is a process explanatory diagram showing a bonding method for a semiconductor chip with a resin adhesive manufactured by the method for manufacturing a semiconductor chip with a resin adhesive according to Embodiment 2 of the present invention.
- FIG. 10D is a process explanatory view showing a method for bonding a semiconductor chip with a resin adhesive manufactured by the method for manufacturing a semiconductor chip with a resin adhesive according to Embodiment 2 of the present invention.
- FIG. 1A to 1F are process explanatory views of a substrate processing method according to Embodiment 1 of the present invention.
- FIG. 2 is a plan view of a semiconductor wafer which is a target of the substrate processing method according to the first embodiment of the present invention.
- FIG. 3 is an enlarged view of a liquid repellent pattern in the substrate processing method according to the first embodiment of the present invention.
- FIG. 4 is an enlarged cross-sectional view of a semiconductor wafer that is a target of the substrate processing method according to the first embodiment of the present invention.
- FIG. 5 is an enlarged view showing a liquid resin and a liquid repellent pattern in the substrate processing method according to the first embodiment of the present invention.
- FIG. 6 is a cross-sectional view of a resin layer and a mask in the substrate processing method according to Embodiment 1 of the present invention.
- the liquid repellent pattern and mask used in the first embodiment will be described.
- a resin (liquid repellent) that exhibits liquid repellency with respect to a solvent contained in a liquid resin used for mask formation described later is used.
- a liquid (liquid repellent liquid) in which a liquid repellent is dissolved in a solvent is printed in a predetermined pattern by transfer printing, screen printing, dispensing, ink jet, etc., and the liquid component is volatilized by volatilizing the solvent component. The pattern is complete.
- the mask is made of a resin (resist) that is not removed by fluorine gas plasma but can be easily removed (ashed) by oxygen or oxygen-containing gas plasma.
- resins include hydrocarbon resins.
- the liquid repellent be a combination that exhibits liquid repellency with respect to the solvent contained in the liquid resin used for mask formation.
- the solvent must be selected to be compatible with the resist resin.
- the resist is a hydrocarbon resin (SP value 7.0 to 8.0)
- SP value 7.0 to 8.0 a saturated hydrocarbon solvent having an SP value of 7.0 to 8.0 is used as the solvent.
- the solvent used for the liquid repellent and the liquid resin a combination of materials having different SP values, preferably a combination of which the difference of SP values is 1.0 or more is selected.
- the solvent is a saturated hydrocarbon solvent (SP value 7.0 to 8.0)
- acrylic resin SP value 9.2
- fluorine resin SP value 3.6
- a saturated hydrocarbon solvent having an SP value of 8.0 a silicon resin (SP value 7.0) can be used as a liquid repellent.
- the liquid resin used for mask formation on the surface to be processed other than the liquid repellent pattern can be easily obtained. Can be arranged.
- This substrate processing method performs a process of partially removing the material constituting the substrate by etching using plasma processing.
- a substrate a semiconductor wafer partitioned into a plurality of semiconductor devices by a scribe line is used as a substrate, and the portion of the scribe line is partially removed by etching using plasma.
- An example of plasma dicing divided into one semiconductor chip is shown.
- the first embodiment includes a plurality of semiconductor devices on a circuit formation surface, and a semiconductor wafer made up of individual semiconductor devices by etching a semiconductor wafer on which a protective sheet for protecting the circuit formation surface is attached by plasma treatment.
- a method of manufacturing a semiconductor chip that is divided into chips is shown.
- a semiconductor wafer 1 as a substrate is formed with a plurality of semiconductor chips on which integrated circuits (semiconductor devices) are formed.
- a protective sheet 2 for protecting the integrated circuit is attached to the circuit forming surface 1a on the semiconductor wafer 1 where the integrated circuit is formed.
- the back surface 1b opposite to the circuit forming surface 1a is thinned to a thickness of 100 ⁇ m or less by removing the surface layer by mechanical grinding in the thinning step of the previous step.
- a scribe line 1c for dividing the semiconductor wafer 1 into individual semiconductor chips 1e on the back surface 1b of the semiconductor wafer 1 (corresponding to a processing target surface to be etched in the substrate) (see FIG. 2).
- a liquid repellent pattern is formed along a lattice line corresponding to (liquid repellent pattern forming step).
- the liquid repellent pattern forming process includes a printing process in which a liquid repellent liquid is printed in a predetermined pattern on the surface to be processed, and a solvent component of the printed liquid repellent liquid is volatilized to dispose the liquid repellent on the surface to be processed. And a baking step for forming the liquid repellent film 3 in a fixed manner.
- a method capable of supplying a liquid-repellent liquid in a linear form such as transfer printing, screen printing, dispensing, and inkjet, is used. That is, as shown in FIG. 3, the liquid to be the liquid repellent film 3 is applied to the printing width b (20 ⁇ m) within the width range of the scribe line 1c set in consideration of the dicing allowance of the section width B (about 50 ⁇ m to 60 ⁇ m). About), printing is performed along the lattice shape of the scribe line 1c. At this time, as the position of the liquid repellent film 3 in the width direction, it is sufficient that the liquid repellent film 3 is within the range of the section width B of the scribe line 1c. Is done.
- the linearity of the edges 3a on both sides in the width direction of the liquid repellent film 3 is not required to have high linear accuracy, and may have a somewhat wavy shape.
- the semiconductor wafer 1 is sent to the baking process, where it is heated to about 40 ° C. to 50 ° C., thereby forming the liquid repellent film 3 with the liquid repellent adhered to the back surface 1b.
- the thickness t1 of the liquid repellent film 3 is about 0.1 ⁇ m to 2 ⁇ m.
- the baking process is performed in a vacuum state, the baking temperature can be lowered and the expansion of the printing width b can be prevented.
- a solvent component volatilizes during a printing process, it is not necessary to perform a baking process.
- a liquid resin for mask formation is supplied to the back surface 1b, which is the processing target surface of the semiconductor wafer 1 on which the liquid repellent pattern is formed by the liquid repellent film 3.
- the liquid resin is repelled from the surface of the liquid repellent film 3 having liquid repellency and adheres only to the region where the liquid repellent film 3 does not exist.
- the resin film 4 is formed in the area
- the resin (resist) contained in the liquid resin used here is not removed by plasma etching performed for the purpose of removing silicon, which is the material of the semiconductor wafer 1, but by plasma ashing for subsequent mask removal.
- a hydrocarbon-based resin that can be easily removed is used.
- the resin film 4 is formed using a solution obtained by dissolving the hydrocarbon resin in a saturated hydrocarbon solvent. The concentration of the hydrocarbon-based resin in the solution affects not only the viscosity of the liquid resin but also the planar spread (mask shape) of the resin film 4 with respect to the liquid-repellent pattern. deep.
- Various methods such as dipping, spin coating, dispensing, and inkjet can be used for forming the resin film 4.
- FIG. 5 shows an enlarged view of the contact state between the liquid repellent film 3 and the resin film 4 after the resin film forming step.
- the edges 3a on both sides in the width direction of the liquid repellent film 3 have a minute wavy shape (sawtooth shape), but the outline 4a (shown by a broken line in FIG. 5) of the resin film 4 in contact therewith is almost linear. Smooth lines. This is because the resin film 4 is liquid and has surface tension, and has a characteristic that it is difficult to follow the minute irregularities of the edge 3a by the action of the surface tension. This property is very convenient for making a mask with smooth edges.
- a mask having an edge (smooth edge) corresponding to the outline 4a is formed.
- the semiconductor wafer 1 on which the resin film 4 is formed is sent again to the baking process, and the semiconductor wafer 1 is heated to a temperature within the range of 40 ° C. to 70 ° C., thereby volatilizing the solvent of the resin film 4.
- a mask 4m is formed on the back surface 1b, which is the surface to be processed (mask forming process), covering a region other than the region (the range of the liquid repellent film 3 set along the scribe line 1c) to be removed by etching by plasma treatment.
- FIG. 6 is a sectional view of the resin film and the mask.
- the solvent evaporates from the resin film 4, so that the mask thickness t3 is smaller than the resin film thickness t2.
- the adjustment of the mask thickness t3 is performed by adjusting the film thickness t2 of the resin film 4, that is, by controlling the coating amount of the liquid resin.
- the required mask thickness t3 is determined in consideration of etching resistance and ashing time.
- the value of t3 is preferably in the range of 5 ⁇ m to 20 ⁇ m. Further, the relationship (shrinkage rate) between t2 and t3 can be obtained by experiments or the like.
- the film thickness t2 of the resin film 4 necessary for obtaining the required mask thickness t3 is obtained from the shrinkage rate and the thickness t3.
- the amount of liquid resin necessary for the film thickness t2 is also obtained by geometric calculation.
- a process of dissolving the liquid repellent pattern formed by the liquid repellent film 3 with a solvent and removing it from the back surface 1b, which is the processing target surface, is performed (liquid repellent pattern removing process).
- a solvent such as ketones, polyhydric alcohols, cyclic ethers, lactones, and esters is supplied to the back surface 1b after the mask is formed, and the resin component of the liquid repellent film 3 is dissolved together with the solvent. This is done by removing.
- a solvent having a small difference from the SP value of the substance used for the liquid repellent film 3 is selected.
- a method for removing the liquid repellent film 3 by supplying a solvent to the back surface 1b dipping, spin etching, spray injection, or the like can be used.
- the liquid-repellent pattern removal step may be performed by plasma ashing using oxygen gas plasma. That is, the plasma of oxygen gas is irradiated from the back surface 1b side on the semiconductor wafer 1 after the mask formation process. Thereby, the liquid repellent film 3 and the mask 4m, both of which are organic substances, are ashed and removed by the ashing action of the oxygen gas plasma, but the thickness t3 of the mask 4m is sufficiently larger than the thickness t1 of the liquid repellent film 3. Therefore, even after the lyophobic film 3 is removed by ashing, the mask 4m remains on the back surface 1b with a sufficient film thickness and can function as a mask in etching using plasma.
- etching for dicing is performed on the semiconductor wafer 1 by plasma treatment from the back surface 1b side, which is the processing target surface of the semiconductor wafer 1, until the protective sheet 2 is exposed (etching step).
- the semiconductor wafer 1 is sent to the plasma processing apparatus, and the semiconductor wafer 1 is irradiated with the plasma P (FIG. 1E) of fluorine-based gas such as SF6 from the back surface 1b side.
- the plasma P FOG. 1E
- the semiconductor wafer 1 in a range exposed to the plasma P without being covered with the mask 4m on the back surface 1b is removed by the etching action of the plasma P to form an etching groove 1d, and the etching groove 1d is formed in the semiconductor wafer.
- the semiconductor wafer 1 is divided into individual semiconductor chips 1e as shown in FIG. 1E.
- the mask 4m having a smooth edge is formed, so that a smooth cut surface without unevenness is realized even at the dicing edge of the semiconductor chip 1e divided into pieces. Therefore, it is possible to suppress the occurrence of defects that reduce the reliability of the semiconductor chip, such as defects that are likely to occur when the cut surface is rough, that is, fine cracks caused by stress concentration in fine irregularities. .
- a process for removing the mask 4m from the back surface 1b that is the processing target surface is performed on the semiconductor wafer 1 after the etching process is completed (mask removal process).
- This mask removal is performed by ashing in which the resin film 4 containing a hydrocarbon-based resin as a component is incinerated by plasma of oxygen gas.
- a method of mechanically peeling the mask 4m from the back surface 1b or a method of removing the wet mask with a chemical solution may be used.
- the aggregate of the semiconductor chips 1e is sent to a die bonding apparatus, and each individual semiconductor chip 1e is held by a bonding head and taken out from a dicing sheet.
- the liquid repellent liquid 3 is printed by printing the liquid repellent liquid on the portion to be etched.
- the liquid repellent pattern is formed, a liquid resin is supplied to the processing target surface of the semiconductor wafer 1 on which the liquid repellent pattern is formed, and the thickness of the liquid repellent film 3 is applied to a region where the liquid repellent pattern is not formed.
- a method of forming a mask 4m that covers a region other than the region to be removed by etching is formed by forming a thick resin film 4 and processing the semiconductor wafer on which the resin film 4 is formed in a baking process. Yes.
- liquid repellent pattern in the above method does not require high positional accuracy and shape accuracy, it can be handled at low cost by existing technology using simple and inexpensive equipment. Therefore, a mask for etching by plasma treatment can be formed at a low cost without using a high-cost method such as a photolithography method or a laser irradiation method.
- FIG. 2 is a process explanatory views of a method of manufacturing a semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 8 is an enlarged view of a liquid repellent pattern in the method of manufacturing a semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- FIG. 9 is an enlarged cross-sectional view of a semiconductor wafer that is a target of plasma dicing in the method of manufacturing a semiconductor chip with a resin adhesive according to the second embodiment of the present invention.
- 10A to 10D are process explanatory views showing a bonding method for a semiconductor chip with a resin adhesive manufactured by the method for manufacturing a semiconductor chip with a resin adhesive according to Embodiment 2 of the present invention.
- a resin film formed for use as a mask for etching by plasma treatment in a semiconductor chip manufacturing method to which the substrate processing method shown in the first embodiment is applied is used for die bonding.
- the example used as a resin adhesive layer for this is shown.
- FIG. 7A to FIG. 9 the same components as those in the first embodiment are denoted by the same reference numerals, and only elements having different configurations are denoted by different reference numerals.
- the liquid repellent pattern used in the second embodiment will be described.
- a resin (liquid repellent) that exhibits liquid repellency with respect to a solvent contained in a liquid resin used for forming a resin adhesive layer described later is used.
- the liquid repellent pattern is formed by printing a liquid repellent liquid in a predetermined pattern by transfer printing, screen printing, dispensing, ink jet or the like, and volatilizing the solvent component, as in the first embodiment.
- thermosetting resin is used for the resin forming the resin adhesive layer.
- a liquid resin obtained by dissolving a thermosetting resin in a solvent is applied to the surface to be processed of the substrate on which the above-described liquid repellent pattern is formed by a method such as dispensing, inkjet, spin coating or the like. Since the solvent of the liquid resin applied to the surface to be processed is repelled by the liquid repellent, only the region of the surface to be processed excluding the liquid repellent pattern portion is spread. Then, the substrate coated with the liquid resin is heated to volatilize the solvent component, and the thermosetting resin is semi-cured to form a resin adhesive layer.
- the liquid repellent be a combination that exhibits liquid repellency with respect to the solvent contained in the liquid resin used for forming the resin adhesive layer.
- the solvent must be selected to be compatible with the thermosetting resin. Therefore, if the thermosetting resin is an epoxy thermosetting resin (SP value 10.9), an alcohol solvent having an SP value of 10.0 to 11.9 is used as the solvent. In this case, acrylic resin (SP value 9.2), silicon resin (SP value 7.0), and fluorine resin (SP value 3.6) can be used as the liquid repellent.
- FIG. 7A a semiconductor wafer 1 as a substrate is formed with a plurality of semiconductor chips on which integrated circuits (semiconductor devices) are formed, and an integrated circuit is formed on the circuit forming surface 1a on which the integrated circuits are formed on the semiconductor wafer 1.
- a protective sheet 2 for protecting the circuit is attached.
- the back surface 1b of the circuit forming surface 1a is thinned to a thickness of 100 ⁇ m or less by removing the surface layer by mechanical grinding in the thinning step of the previous step.
- a scribe line 1c which is a boundary for dividing the semiconductor wafer 1 into individual semiconductor chips 1e.
- a liquid repellent pattern is formed along the grid lines to be formed (liquid repellent pattern forming step). Since this liquid repellent pattern forming step is the same as that of the first embodiment, detailed description thereof is omitted.
- a liquid resin for forming a resin adhesive layer is supplied to the back surface 1b of the semiconductor wafer 1 on which the liquid repellent pattern is formed by the liquid repellent film 3.
- the liquid resin is repelled from the surface of the liquid repellent film 3 having liquid repellency and adheres only to the region where the liquid repellent film 3 does not exist.
- a resin film 40 having a thickness t2 larger than the thickness t1 of the liquid repellent pattern is formed in a region where the liquid repellent pattern is not formed on the back surface 1b of the semiconductor wafer 1 (resin film forming step).
- the liquid resin used here is not removed by plasma etching performed for the purpose of removing silicon, which is the material of the semiconductor wafer 1, and is further bonded by resin bonding in die bonding of the semiconductor chip after the semiconductor wafer 1 is divided.
- An epoxy-based thermosetting resin that functions as a layer is selected.
- Various methods such as dipping, spin coating, dispensing, and ink jet can be used for forming the resin film 40.
- FIG. 8 shows an enlarged view of the vicinity of the liquid repellent film 3 on the back surface 1b after the resin film forming step.
- the edges 3a on both sides in the width direction of the liquid repellent film 3 have a minute wavy shape (sawtooth shape), but the outline 40a (shown by a broken line in FIG. 8) of the resin film 40 in contact with the edge 3a is almost linear. Smooth lines. This is because the resin film 40 is liquid and has a surface tension, and has a characteristic that it is difficult to follow the minute irregularities of the edge 3a due to the action of the surface tension. This property is very convenient for making a mask with smooth edges. When the resin film 40 having the smooth outline 40a is processed in the subsequent baking process, a mask having an edge (smooth edge) corresponding to the outline 40a is formed.
- the semiconductor wafer 1 on which the resin film 40 is formed is sent to a curing process, and the semiconductor wafer 1 is heated to a temperature of about 90 ° C.
- the resin film 40 is semi-cured to a B stage state, and the resin adhesive layer 40m is formed (resin adhesive layer forming step).
- the resin adhesive layer 40m covers a region other than the region (the range of the liquid repellent film 3 set along the scribe line 1c) that is removed by the etching by the plasma processing, Acts as a mask.
- the thickness of the resin adhesive layer 40m is reduced by the amount of the solvent evaporated from the shape after application.
- FIG. 9 is a cross-sectional view of the resin film and the resin adhesive layer. Since the solvent evaporates from the resin film 40 in the resin adhesive layer forming step, the thickness t5 of the resin adhesive layer 40m is thinner than the film thickness t4 of the resin film 40. For this reason, the adjustment of the thickness t5 of the resin adhesive layer 40m is performed by adjusting the thickness t4 of the resin film 40, that is, controlling the application amount of the liquid resin.
- the required thickness t5 of the resin adhesive layer 40m is determined by the thickness of the semiconductor chip 1e to be bonded, the thickness of the adhesive layer after bonding, and the like.
- the value of t5 is determined by the thickness of the adhesive layer for die-bonding the semiconductor chip 1e, and a range of 20 ⁇ m to 30 ⁇ m is a reasonable value. Further, the relationship (shrinkage rate) between t4 and t5 can be obtained by experiments or the like. Accordingly, the film thickness t4 of the resin film 40 necessary for obtaining the required thickness t5 of the resin adhesive layer 40m is obtained from the shrinkage rate and the thickness t5. When the film thickness t2 is obtained, the amount of liquid resin necessary for the film thickness t2 is also obtained by geometric calculation.
- liquid repellent pattern removing step a process of dissolving the liquid repellent pattern by the liquid repellent film 3 with a solvent and removing it from the back surface 1b is performed (liquid repellent pattern removing step). Since this process is the same as the liquid repellent pattern removing process of the first embodiment, the description thereof is omitted.
- the resin adhesive layer 40m is used as a mask to the semiconductor wafer 1 for dicing from the back surface 1b that is the processing target surface. Etching is performed (etching process).
- the semiconductor wafer 1 is sent to the plasma processing apparatus, and the semiconductor wafer 1 is irradiated with the fluorine-based plasma P (FIG. 7E) such as SF6 from the back surface 1b side.
- the fluorine-based plasma P FIG. 7E
- the semiconductor wafer 1 in the range exposed to the plasma P without being covered with the resin adhesive layer 40m on the back surface 1b is removed by the etching action of the plasma P to form an etching groove 1d.
- the semiconductor wafer 1 is divided into individual semiconductor chips 1e as shown in FIG. 7E.
- the thermal action of the plasma P reaches the resin adhesive layer 40m.
- the surface temperature of the resin adhesive layer 40m is the thermosetting of the selected epoxy resin. It is required to control the temperature conditions so as not to exceed the temperature (100 ° C. to 150 ° C.).
- This temperature condition is controlled by appropriately adjusting the plasma processing conditions in the plasma processing apparatus to be used, for example, by adjusting the output of the high frequency power supply device, or circulating the cooling medium in the electrode portion on which the semiconductor wafer 1 to be processed is placed.
- a method is used in which the temperature is controlled by cooling means such as to prevent the temperature of the semiconductor wafer 1 from rising beyond an appropriate range.
- the semiconductor wafer 1 to which the protective sheet 2 for protecting the circuit forming surface 1a is attached is divided by plasma dicing, so that a plurality of semiconductors with resin adhesive layers are obtained.
- a semiconductor chip assembly 10 divided into chips 1f is completed.
- the semiconductor chip 1f with a resin adhesive layer has a configuration in which a resin adhesive layer 40m for die bonding is provided on the back surface 1b of the semiconductor chip 1e.
- Each semiconductor chip 1f with a resin adhesive layer is formed from the semiconductor chip assembly 10. It is taken out individually and becomes the object of bonding to the substrate.
- a semiconductor chip assembly 10 in a state where a plurality of semiconductor chips 1f with a resin adhesive layer are held on a protective sheet 2 is a wafer having a configuration in which a holding sheet 11 is extended on an annular wafer ring 12a. It is held by the jig 12. That is, the semiconductor chip assembly 10 is held by the wafer jig 12 by attaching the resin adhesive layer 40 m to the holding sheet 11 with the protective sheet 2 as the upper surface side.
- the protective sheet 2 is peeled from the semiconductor chip assembly 10 so that each semiconductor chip 1f with a resin adhesive layer is exposed with the circuit formation surface 1a of the semiconductor chip 1e facing upward. It becomes. Then, the semiconductor chip assembly 10 is sent to the die bonding apparatus in this state, and the wafer ring 12a is held by the wafer holding mechanism 13 of the die bonding apparatus as shown in FIG. The semiconductor chip 1f can be taken out.
- the bonding tool 14 and the ejector device 15 are aligned with the semiconductor chip 1f with the resin adhesive layer to be taken out, and the ejector pins 16 provided in the ejector device 15 are used for taking out the semiconductor chip 1f.
- the semiconductor chip 1e is sucked and held by the bonding tool 14 while the semiconductor chip 1f with the resin adhesive layer is pushed up from below.
- the bonding tool 14 has a built-in heating means, and the semiconductor chip 1f with a resin adhesive layer is heated to a predetermined temperature by being held by the bonding tool 14.
- the bonding tool 14 that sucks and holds the semiconductor chip 1f with the resin adhesive layer moves to above the heating receiving portion 17 that holds the substrate 18 to be bonded.
- the substrate 18 is heated to a predetermined temperature in advance by a heating mechanism (not shown) provided in the heating receiving portion 17.
- a heating mechanism not shown
- the semiconductor chip 1f with a resin adhesive layer is positioned at the bonding position, the bonding tool 14 is lowered, and the resin adhesive layer 40m is landed on the upper surface of the substrate 18.
- the semiconductor chip 1 f with a resin adhesive layer is pressed with a predetermined pressure by the bonding tool 14, and the resin adhesive layer 40 m is pressed against the substrate 18.
- the thermosetting reaction of the semi-cured resin adhesive layer 40m proceeds, and the semiconductor chip 1e is bonded to the substrate 18 by the thermosetting resin adhesive layer 40m.
- the circuit formation surface of the semiconductor wafer 1 is formed.
- a liquid repellent liquid is printed on the scribe line 1c that is the boundary of the semiconductor chip 1e on the back surface 1b that is the opposite side of 1a to form a liquid repellent pattern, and the back surface 1b of the semiconductor wafer 1 on which the liquid repellent pattern is formed.
- a resin film 40 having a thickness larger than the thickness of the liquid repellent pattern is formed in a region where the liquid repellent pattern is not formed, and then the resin film 40 is semi-cured to form a resin.
- the resin adhesive layer 40m is used as a mask for the semiconductor wafer 1. It is to adopt a method of performing etching from the back surface 1b side. Accordingly, a mask for etching using plasma treatment can be formed at low cost, and this mask can be used as the resin bonding layer 40m for die bonding.
- an example in which the processing of dividing a semiconductor wafer as a substrate into individual semiconductor chips by plasma dicing is an object of the present invention, but the present invention is not limited to this.
- the present invention can be applied to any form that is not intended to be processed and that requires mask formation along with etching by plasma treatment.
- an application example in which through-hole processing on a semiconductor substrate is performed by etching using plasma and in the manufacturing process of MEMS (microelectromechanical system), a semiconductor process technology is applied to form a micro mechanical device using plasma.
- MEMS microelectromechanical system
- the present invention can be applied to various types of processing for a substrate such as an application example performed by etching and an application example for forming a circuit pattern in a transparent panel for display.
- the substrate processing method and the semiconductor chip manufacturing method of the present invention are characterized in that a mask for etching by plasma can be formed at low cost, and a semiconductor wafer as a substrate is divided into individual semiconductors by plasma dicing. This is useful for processing various substrates such as processing to divide into chips.
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Abstract
Description
1a 回路形成面
1b 裏面(加工対象面)
1c スクライブライン
1e,1f 半導体チップ
2 保護シート
3 撥液膜
4 樹脂膜
4m マスク
40 樹脂膜
40m 樹脂接着層
P プラズマ
図1A~図1Fは本発明の実施の形態1の基板の加工方法の工程説明図である。図2は本発明の実施の形態1の基板の加工方法の対象となる半導体ウェハの平面図である。図3は本発明の実施の形態1の基板の加工方法における撥液パターンの拡大図である。図4は本発明の実施の形態1の基板の加工方法の対象となる半導体ウェハの拡大断面図である。図5は本発明の実施の形態1の基板の加工方法における液状の樹脂と撥液パターンを示す拡大図である。図6は本発明の実施の形態1の基板の加工方法における樹脂層とマスクの断面図である。
図7A~図7Fは本発明の実施の形態2の樹脂接着剤付き半導体チップの製造方法の工程説明図である。図8は本発明の実施の形態2の樹脂接着剤付き半導体チップの製造方法における撥液パターンの拡大図である。図9は本発明の実施の形態2の樹脂接着剤付き半導体チップの製造方法におけるプラズマダイシングの対象となる半導体ウェハの拡大断面図である。図10A~図10Dは本発明の実施の形態2の樹脂接着剤付き半導体チップの製造方法によって製造された樹脂接着剤付き半導体チップのボンディング方法を示す工程説明図である。
Claims (3)
- プラズマ処理を用いたエッチングによって基板を部分的に除去する加工を行う基板の加工方法であって、
前記基板の加工対象面において前記エッチングによって除去される領域に撥液性の液体を印刷して撥液パターンを形成する撥液パターン形成工程と、
前記撥液パターンが形成された基板の前記加工対象面に液状の樹脂を供給することにより、前記撥液パターンの形成されていない領域に前記撥液パターンの厚みよりも厚い膜厚の樹脂膜を形成する樹脂膜形成工程と、
前記樹脂膜を硬化させて前記エッチングによって除去される領域以外を覆うマスクを前記加工対象面に形成するマスク形成工程と、
前記マスク形成工程の後、前記撥液パターンを前記加工対象面から除去する撥液パターン除去工程と、
前記撥液パターン除去工程の後、前記基板の加工対象面側よりプラズマ処理によってエッチングを行うエッチング工程と、
前記エッチング工程終了後、前記マスクを前記加工対象面から除去するマスク除去工程と、を含むことを特徴とする
基板の加工方法。 - 回路形成面に複数の半導体装置を備えるとともに前記回路形成面を保護する保護シートが貼り付けられた半導体ウェハをプラズマ処理によるエッチングによって個々の半導体装置から成る半導体チップに分割する半導体チップの製造方法であって、
前記半導体ウェハの回路形成面の反対側面である加工対象面において半導体チップの境界であるスクライブラインに撥液性の液体を印刷して撥液パターンを形成する撥液パターン形成工程と、
前記撥液パターンが形成された半導体ウェハの前記加工対象面に液状の樹脂を供給することにより、前記撥液パターンの形成されていない領域に前記撥液パターンの厚みよりも厚い膜厚の樹脂膜を形成する樹脂膜形成工程と、
前記樹脂膜を硬化させて前記エッチングによって除去される領域以外を覆うマスクを前記加工対象面に形成するマスク形成工程と、
前記マスク形成工程の後、前記撥液パターンを前記加工対象面から除去する撥液パターン除去工程と、
前記撥液パターン除去工程の後、前記加工対象面側から前記保護シートが露呈するまで、前記半導体ウェハに対して前記加工対象面側からエッチングを行うエッチング工程と、
前記エッチング工程終了後、前記マスクを前記加工対象面から除去するマスク除去工程と、を含むことを特徴とする
半導体チップの製造方法。 - 回路形成面に複数の半導体装置を備えるとともに前記回路形成面を保護する保護シートが貼り付けられた半導体ウェハをプラズマ処理によるエッチングにより個々の半導体装置に分割するプラズマダイシングによって裏面にダイボンディングのための樹脂接着層を備えた
樹脂接着剤付き半導体チップを製造する樹脂接着剤付き半導体チップの製造方法であって、
前記半導体ウェハの回路形成面の反対側面である裏面において前記半導体チップの境界であるスクライブラインに撥液性の液体を印刷して撥液パターンを形成する撥液パターン形成工程と、
前記撥液パターンが形成された半導体ウェハの前記裏面に液状の樹脂を供給することにより、前記撥液パターンの形成されていない領域に前記撥液パターンの厚みよりも厚い膜厚の樹脂膜を形成する樹脂膜形成工程と、
前記樹脂膜を半硬化させて樹脂接着層を形成する樹脂接着層形成工程と、
前記樹脂接着層形成工程の後、前記撥液パターンを前記裏面から除去する撥液パターン除去工程と、
前記撥液パターン除去工程の後、前記裏面側から前記保護シートが露呈するまで、前記半導体ウェハに対して前記樹脂接着層をマスクとして前記裏面側からエッチングを行うエッチング工程とを含むことを特徴とする
樹脂接着層付き半導体チップの製造方法。
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