WO2001075954A1 - Procede de decoupage d'une plaquette de semi-conducteur en puces - Google Patents
Procede de decoupage d'une plaquette de semi-conducteur en puces Download PDFInfo
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- WO2001075954A1 WO2001075954A1 PCT/JP2001/002015 JP0102015W WO0175954A1 WO 2001075954 A1 WO2001075954 A1 WO 2001075954A1 JP 0102015 W JP0102015 W JP 0102015W WO 0175954 A1 WO0175954 A1 WO 0175954A1
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- Prior art keywords
- dividing
- semiconductor wafer
- groove
- dividing groove
- semiconductor
- Prior art date
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 194
- 238000000034 method Methods 0.000 title claims abstract description 89
- 239000000758 substrate Substances 0.000 claims abstract description 68
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000005530 etching Methods 0.000 claims abstract description 21
- 238000005422 blasting Methods 0.000 claims abstract description 20
- 229910002601 GaN Inorganic materials 0.000 claims description 23
- 239000010419 fine particle Substances 0.000 claims description 17
- 229910052594 sapphire Inorganic materials 0.000 claims description 16
- 239000010980 sapphire Substances 0.000 claims description 16
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 229910052580 B4C Inorganic materials 0.000 claims description 2
- 229910052582 BN Inorganic materials 0.000 claims description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000011859 microparticle Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 238000005498 polishing Methods 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000001312 dry etching Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- -1 gallium nitride compound Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001020 plasma etching Methods 0.000 description 2
- 238000000992 sputter etching Methods 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- YLZOPXRUQYQQID-UHFFFAOYSA-N 3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]propan-1-one Chemical compound N1N=NC=2CN(CCC=21)CCC(=O)N1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F YLZOPXRUQYQQID-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000006061 abrasive grain Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000013001 point bending Methods 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
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
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
- H01L21/3046—Mechanical treatment, e.g. grinding, polishing, cutting using blasting, e.g. sand-blasting
-
- 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
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
- H01L21/3043—Making grooves, e.g. cutting
-
- 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
- H01L21/3081—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their composition, e.g. multilayer masks, materials
-
- 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
Definitions
- the present invention relates to a method for dividing a semiconductor wafer having a semiconductor layer formed on a substrate into a large number of semiconductor chips.
- a groove is formed in a wafer by dicing or a scribe line is formed in a scribe, and then the groove or scribe line is formed as a starting point along a groove along the groove by a breaking.
- a common method is to break the ha.
- Dicing is a method of forming a dicing groove in a wafer by relatively moving a rotary blade of a dicer (dicing source) and a wafer.
- Scribing is a method of forming a scribe line on a wafer by moving the sharpened blade of the scriber and the wafer relative to each other.
- Breaking is a method of breaking a wafer by pressing the wafer with a pressing blade or pressing roller and performing three-point bending.
- a semiconductor wafer using a substrate made of a high-hardness material for example, sapphire, GaN, etc.
- a substrate made of a high-hardness material for example, sapphire, GaN, etc.
- Breaking had to be done after deep dicing and devise such as scribing after the substrate was made significantly thinner.
- the following methods are known as methods for dividing a wafer in which a gallium nitride-based compound semiconductor is stacked on the surface of a sapphire substrate into chips.
- the method described in Japanese Patent No. 2756654 includes the following steps.
- a first split groove is formed linearly (by etching) in a desired chip shape from the gallium nitride compound semiconductor layer side of the wafer, and the first split groove penetrates the gallium nitride compound semiconductor layer. Process to a depth excluding a part of the sapphire substrate
- the method using both dicing and scribing as described in (1) and (2) above has a problem that cracking and chipping easily occur in the substrate and the semiconductor layer during dicing, and the yield is not good. Also, a large number of dicing grooves and scribe lines must be formed on the wafer, but at present, each one has to be formed one by one, resulting in a long processing time and poor efficiency. Furthermore, rotary blades for dicing were expensive and did not have a long service life.
- etching is the least likely to damage the nitride semiconductor surface and side surface
- reactive ion etching, ion milling, focused beam etching, ECR Dry etching such as etching and wet etching using a mixed acid of sulfuric acid and phosphoric acid are mentioned.
- these etchings can simultaneously form a plurality of or many grooves, but the processing time is not short and the efficiency is low.
- these etching apparatuses, especially dry etching apparatuses are very expensive and processing costs are high.
- the line width of the first split groove from the semiconductor layer forming side is made wider than the line width of the second split groove from the sapphire substrate side. This is to prevent the cutting line generated from the split groove from reaching the semiconductor layer even if it runs diagonally. Therefore, in the embodiment of the publication, the line width of the first split groove is 80 zm. Wide. Increasing the width of the groove formed on the semiconductor layer forming side in this way causes a problem that the area of the semiconductor layer in the semiconductor chip to be divided is reduced and the luminance is reduced, and the area is not reduced. The number of semiconductor chips will decrease There was also a problem. Disclosure of the invention
- a first object of the present invention is to solve the above-mentioned problems, and to provide a method for dividing a semiconductor wafer into chips, which has a good yield, is high in efficiency, and can reduce equipment cost and processing cost.
- a second object of the present invention is to solve the above-mentioned problems, to increase the area of the semiconductor layer in the semiconductor chip to be divided, to increase the light emission luminance, and to increase the number of semiconductor chips that can be obtained.
- Another object of the present invention is to provide a method for dividing a semiconductor wafer into chips, which can facilitate braking.
- a method of dividing a semiconductor wafer in which a semiconductor layer is formed on a substrate, into a plurality of semiconductor chips, wherein a pattern leaving a grid-shaped exposed portion on the surface of the semiconductor wafer is provided.
- the plast is such that the fine particle blasting material spreads over a plurality of grid lines of the grid-shaped exposed portion while relatively feeding the semiconductor wafer and an injection device such as a nozzle along the surface direction of the semiconductor wafer. It is preferable to simultaneously form a plurality of dividing grooves by performing blasting. This is because the dividing grooves can be dug correctly in the thickness direction of the semiconductor wafer and the forming efficiency of the dividing grooves can be increased.
- the distance between the semiconductor wafer and the nozzle is not particularly limited, but is preferably from 10 to 150 mm. If this distance is too short, the damage to the mask will be large, and if this distance is too long, the processing speed will be low and the processing time will be long.
- the feed rate is not particularly limited, but is preferably 5 to 20 O mmZ seconds. If the feed speed is too low, the damage to the mask due to heat generation will be large, and if the feed speed is too high, the verticality of the processed surface will be poor.
- the depth of the dividing groove can also be increased.
- the number of passes is not particularly limited, 3 to 20 passes are preferable.
- the width of the dividing groove is not particularly limited, but is preferably 10 to 500 // m. If the width is too small, a sufficient depth cannot be obtained, and it is difficult to select a fine particle blast material. If the width is too large, the number of semiconductor chips to be removed decreases.
- the depth of the dividing groove in the substrate is not particularly limited, but is preferably 1 to 100 / m, more preferably 5 to 5 Om. If the depth is small, the effect of reducing the thickness of the substrate remaining under the groove and facilitating division is weakened. If the depth is large, blasting takes too much time.
- the material of the fine particle blast material is not particularly limited, but when the substrate is made of sapphire or GaN, the fine particle blast material is preferably made of a material having a Vickers hardness of 120 or more. Specifically, for example, at least one selected from alumina, silicon carbide, boron nitride, boron carbide, and diamond is preferable.
- the average particle diameter of the fine particle blast material is not particularly limited as long as it is smaller than the width of the dividing groove, but is preferably 1/2 to 1/20 in terms of a ratio to the width of the dividing groove, and 1 to 1 in numerical values. 3 O zm is preferred, and 5 to 15 m is more preferred. If the average particle size is too small, the kinetic energy will be small, and if the average particle size is too large, the smoothness of the dividing grooves will decrease.
- the blast amount of the fine particle blast material is not particularly limited, but is preferably 30 to 100 g / sec. If the amount of blast is too small, the processing speed will be low, and if the amount of blast is too large, damage to the mask will be large.
- the blast pressure of the fine particle blast material is not particularly limited, but is preferably 0.2 to 0.8 MPa. If the blast pressure is too low, the processing speed will be low, and if the blast pressure is too high, the damage to the mask will be large.
- the dividing groove can be formed on the surface of the semiconductor wafer on the side where the semiconductor layer is formed, can be formed on the surface of the semiconductor wafer on the side where the semiconductor layer is not formed, or can be formed on both surfaces.
- the semiconductor substrate on the bottom of the dividing groove or on the side opposite to the dividing groove is formed.
- the method may include a step of forming a scribe line by scribing on the surface of the wafer, and a step of dividing the semiconductor wafer into semiconductor chips by breaking the semiconductor wafer from the scribe line as a starting point.
- the method comprises the steps of: Forming a first dividing groove having a narrow groove width by dicing, etching, or plasting; and a groove width relatively to a position corresponding to the first dividing groove on the surface of the semiconductor wafer on the side where the semiconductor layer is not formed. Forming a wide second dividing groove by dicing. Relatively narrow or wide is, of course, the relative relationship between the groove width of the first dividing groove and the groove width of the second dividing groove.
- the “dicing” may be a normal method performed by, for example, a rotary blade to which diamond abrasive grains are attached.
- “Etching” includes reactive ion etching, ion milling, focusing
- Examples include dry etching such as thermal etching and ECR etching, and wet etching using a mixture of sulfuric acid and phosphoric acid. Before etching, use an etching resistant mask with a pattern that leaves a grid-like exposed portion on the surface of the semiconductor wafer. Form.
- the third dividing groove is formed by dicing on the groove bottom of the second dividing groove, where the width of the first dividing groove ⁇ the groove width of the third dividing groove is larger than the groove width of the second dividing groove. It can also add a step of performing.
- the groove cross-sectional shape of the second dividing groove may be substantially U-shaped or substantially V-shaped at the deepest central portion in the width direction.
- the groove width of the first dividing groove is preferably from 10 to 5 Om, and more preferably from 20 to 40 m (as long as the relative relationship is satisfied). When the groove width is small, it is difficult to form the first dividing groove, and when the groove width is large, the area or the number of semiconductor layers to be formed is significantly reduced.
- the groove width of the second dividing groove is preferably 15 to 100 / m, and more preferably 20 to 50 zm (as long as the relative relationship is satisfied). If this groove width is small, The life of the rotary blade is short (the thinner the rotary blade, the shorter the life tends to be). If the groove width is large, the bottom area of the substrate in the semiconductor chip becomes small, and the mechanical stability becomes poor.
- the depth of the first dividing groove and the depth of the second dividing groove are not particularly limited, but the first dividing groove has a relatively small depth, and the second dividing groove has a relatively large depth. Is preferably large. Since the first dividing groove has a relatively narrow groove width and uses a thin rotating blade that tends to have a short life as the rotating blade of the dicer, it is preferable that the first dividing groove is not too deep. is there. In addition, the second dividing groove has a relatively wider groove width and uses a thick rotating blade that tends to have a longer life as the rotating blade of the dicer. is there.
- the thickness of the remaining portion of the substrate remaining between the first dividing groove and the second dividing groove is preferably set to 20 to 100 ⁇ m, more preferably to 20 to 505m. It is even better.
- the breaking can be facilitated. Can be most easily performed.
- the second dividing groove or the third dividing groove can be formed by dicing so as to reach the first dividing groove.
- the present invention from both the first and second viewpoints is not limited by the constituent material of the substrate, but is particularly effective when the substrate is made of a high hardness material having a Mohs hardness of 8 or more. is there.
- the present invention is particularly effective for dividing a semiconductor wafer made of sapphire or GaN and a semiconductor layer made of a gallium nitride-based compound semiconductor.
- FIGS. 1 (A) and 1 (B) show a semiconductor wafer according to the first embodiment of the present invention. It is a perspective view showing a chip division method.
- 2 (A) to 2 (C) are cross-sectional views showing the first half steps of the chip dividing method.
- 3 (A) to 3 (C) are cross-sectional views showing the latter half of the chip dividing method.
- FIG. 4 (A) to 4 (F) are cross-sectional views showing an embodiment of the chip dividing method.
- FIG. 5A is a cross-sectional view of one semiconductor wafer divided by the semiconductor wafer chip dividing method according to the second embodiment of the present invention
- FIG. 5B is a sectional view of a semiconductor wafer formed with dividing grooves. It is a top view at the time.
- FIGS. 6A to 6D are cross-sectional views illustrating a chip dividing method according to the second embodiment.
- FIG. 7A is a cross-sectional view showing the main points of the chip dividing method of the third embodiment
- FIG. 7B is a cross-sectional view showing the main points of the chip dividing method of the fourth embodiment
- FIG. FIG. 4 is a cross-sectional view showing the main points of the chip dividing method according to the embodiment.
- FIGS. 8 (A) to 8 (C) show that in each of the chip dividing methods of the third to fifth embodiments, the second dividing groove or the third dividing groove reaches the first dividing groove.
- FIG. 4 is a cross-sectional view showing the essential points of a chip dividing method formed by dicing. BEST MODE FOR CARRYING OUT THE INVENTION
- the wafer 1 to 3 show a method of dividing a semiconductor wafer into chips according to the first embodiment of the present invention.
- the wafer 1 is composed of a substrate 2 and a semiconductor layer 3 constituting light emitting elements (light emitting diodes, laser diodes, etc.) formed on the surface thereof. Consists of main layers 11 to 16 and electrodes (not shown).
- the substrate 2 is made of sapphire, has a square shape with a plane size of, for example, 2 inches (about 5 cm), a thickness of 350 ⁇ m, and has a surface ⁇ 11-20 ⁇ on which a semiconductor layer is formed.
- the substrate is not limited to this, and the material (for example, using a substrate made of GaN), the planar dimensions, the thickness, the crystal plane, and the like can be appropriately changed.
- Each of the main layers 11 to 16 is a gallium nitride-based compound semiconductor (buffer layer is A1N but may be GaN) formed by metal organic chemical vapor deposition.
- a buffer layer 11 is formed, an Si-doped n-type GaN contact layer 12 is formed on the same layer 11, an n-type GaN cladding layer 13 is formed on the same layer 12, and a GaN layer is formed on the same layer 13.
- a light emitting layer 14 having a multiple quantum well structure in which barrier layers and InGaN well layers are alternately stacked is formed, and on the same layer 14, an Mg-doped p-type A 1 GaN cladding layer 15 is formed.
- An Mg doped p-type GaN contact layer 16 is formed thereon.
- the total thickness of the main layers 11 to 16 is not particularly limited, but is, for example, 2 to: L 5 zm.
- the main layer is not limited to this configuration.
- the composition of each layer is changed, the light emitting layer is changed to a single quantum well structure, for example, or when the substrate 2 is made of GaN, the buffer layer 11 is formed. It can be changed as appropriate, such as omitting it or providing a resonance structure in the case of a laser diode.
- a plast resistant mask 5 having a pattern that leaves a grid-like exposed portion 6 is formed on the surface of the semiconductor wafer 11, for example, on the semiconductor layer forming side.
- the method of forming the blast-resistant mask 5 is not particularly limited, but photolithography is employed here. That is, a film with a photosensitive resist agent (masking agent) is attached to the semiconductor wafer 11, exposed to ultraviolet light, developed with a weak alkaline solution, and dried, so that the blast-resistant mask 5 of the pattern becomes a semiconductor. Adheres on wafer one.
- the planar dimensions of the chip to be divided are squares with a side of about 350 m, and therefore the pitch between adjacent grid lines of the grid-shaped exposed part 6 is 350 zm in both the X and y directions (Fig. 1 (A) and (See Fig. 1 (B)).
- the width of the dividing groove 7 to be formed is about 20, 30, 40, or 50 / m, and accordingly, the width of each grid line of the grid-shaped exposed portion 6 is about 20, 30, 40, or 50 m. .
- the semiconductor wafer 1 is supported on a table (not shown) that can move in the X-y directions. Carry. As shown in FIG. 2 (A), while moving the tape and feeding the semiconductor wafer 11 in the X-y direction, which is the plane direction, the fine particle plast is applied to the semiconductor wafer 11 from the nozzle 20 of the plastifier. By expanding and blasting the material 21 so as to extend to the plurality of grid lines of the grid-shaped exposed portion 6, the grid-shaped exposed portion 6 is simultaneously provided with a plurality of dividing grooves 7 reaching a predetermined depth of the substrate 2. Form. The kinetic energy of the fine-particle blast material 21 blasted at a high speed is caused by the action of microscopically shaving off a part of the semiconductor layer 3 and the substrate 2 appearing in the lattice-shaped exposed portion 6.
- the distance between the semiconductor wafer 11 and the nozzle 20 is about 50 mm, and the feed speed is 50 mm / sec.
- the material of the fine particle blast material is silicon carbide, its average particle size is 8 ⁇ m (# 2000 mesh) or 13 ⁇ m (# 1200 mesh), the blast amount is 60 to 90 g / sec, and the plast pressure is about 0. . 4MPa.
- a dividing groove having a depth of about 0.5 zm is formed in the semiconductor layer 3.
- the depth of the dividing groove is increased by repeating the same plast for 15 passes for an average particle diameter of 8 m and 8 passes for an average particle diameter of 13 / m, and finally, the depth of Fig. 2 (B 2), the semiconductor layer 3 is removed by the entire thickness, and a dividing groove 7 is formed in the substrate 2 to a depth of about 5 m.
- the time required for one pass is about 1 minute. In the case of 8 passes, it can be completed in about 8 minutes.
- the blast-resistant mask 5 is gradually consumed by this blast, and particularly, the corners of the flat rectangle are easily consumed by the entire thickness, so that the semiconductor protected by the blast-resistant mask 5 as shown in Fig. 1 (B). Even in layer 3, a small radius is easily attached to the corner.
- the surface of the substrate 2 having a thickness of 350 ⁇ m on the side where the semiconductor layer is not formed is polished with a polishing machine, so that the substrate 2 has a uniform thickness of about 100 zm. To thinner.
- scribe A scribe line 8 is formed by scribing with a blade.
- the semiconductor wafer 1 is divided along the scribe line 8 by the breaking along the scribe line 8 and divided into a large number of semiconductor chips 10 by breaking.
- Blasting equipment and fine particle blast material 21 are less expensive than etching equipment, and fine particle blasting material 21 can be circulated and used repeatedly, thus reducing equipment cost and processing cost. it can.
- Example 1 group schematically shown in FIGS. 4 (A) to 4 (C) is a group of examples in which the dividing grooves 7 are formed by blasting on the surface of the semiconductor wafer 11 on the side where the semiconductor layer is formed.
- Example 1-1 shown in FIG. 4 (A) is an example corresponding to the first embodiment.
- Example 1-2 shown in FIG. 4 (B) after the dividing groove 7 was formed on the surface of the semiconductor wafer 1 on the side where the semiconductor layer is formed, the smoothness newly appeared by polishing the side of the substrate 2 where the semiconductor layer was not formed. This is an example in which a scribe line 8 is formed by scribing a surface.
- Example 13 shown in FIG. 4 (C) is an example in which, in addition to the first embodiment, a scribe line 8 is formed by scribing on a smooth surface newly appearing by polishing the side of the substrate 2 on which the semiconductor layer is not formed. It is.
- Example 2 group schematically shown in FIGS. 4 (D) to 4 (F) summarizes an example in which the dividing groove 7 is formed by blasting on the surface of the semiconductor wafer 11 on the side where the semiconductor layer is not formed. Thing O
- Example 2-1 shown in FIG. 4D a dividing groove 7 is formed by blasting on the side of the substrate 2 having a thickness of about 100 zm where the semiconductor layer is not formed, and a scribe line 8 is formed on the bottom of the groove. This is an example in which is formed.
- Example 2-2 shown in FIG. 4 (E) after dividing grooves 7 were formed by blasting on the side of the substrate 2 having a thickness of about 100 ⁇ m where the semiconductor layer was not formed, a scribing line was formed on the side where the semiconductor layer was formed. This is an example in which No. 8 is formed.
- Example 2-3 shown in FIG. 4 (F) a dividing groove 7 is formed by blasting on the side of the substrate 2 having a thickness of about 100 / m where the semiconductor layer is not formed, and a scribe line is formed on the groove bottom.
- a scribe line 8 is formed on the semiconductor layer forming side in addition to the formation of the scribe line 8.
- the semiconductor wafer 11 is divided from the scribe line 8 as a starting point by breaking, and divided into a large number of semiconductor chips.
- the present invention is not limited to the above-described embodiment.
- the dividing groove 7 may be formed deep (for example, a depth of 50 ⁇ m or more in the substrate 2) so that the breaking can be performed even if the scribe is omitted. It is possible to
- FIGS. 5 and 6 show a method of dividing a semiconductor wafer into chips according to the second embodiment of the present invention.
- the semiconductor wafer 1 to be divided is as shown in FIG.
- the semiconductor device includes a substrate 2 and a semiconductor layer 3 constituting a light emitting element (light emitting diode, laser diode, etc.) formed on the surface of the substrate 2. ).
- Substrate 2, main layers 1 1 to 16 are shown in Fig. 1 (A) and Fig. 1.
- FIG. 6 shows a second embodiment of the method for dividing the semiconductor wafer 11 into chips, which is performed by the following steps.
- a first dividing groove 25 having a groove width W1 of, for example, about 25 m is diced on the surface of the semiconductor wafer 1 on the semiconductor layer forming side. It is formed by pitching or plasting. The planar dimensions and shape of the semiconductor chip to be divided are The first division groove 25 is formed in a plane lattice-like arrangement with a pitch of 350 / m. Further, the depth of the first dividing groove 25 is formed so that the semiconductor layer 3 is removed by the entire thickness and further reaches a depth of, for example, about 15 m in the substrate 2.
- the surface of the substrate 2 having a thickness of 350 ⁇ m on the side where the semiconductor layer is not formed is polished by a polishing machine, so that the substrate 2 has a uniform thickness of 1 ⁇ m. Reduce the thickness to about 0 m.
- the groove width W 2 is set at a position corresponding to the first dividing groove 25 on the surface of the semiconductor wafer 1 on which the semiconductor layer is not formed.
- a second dividing groove 26 of about 50 zm is formed by dicing.
- the first division groove 25 and the second division groove 26 need only partially overlap the groove width, but the first division groove 25 is the groove of the second division groove 26.
- the width be within the range of the width, and it is further preferable that the central portion in the groove width direction substantially vertically coincides.
- the depth of the second dividing groove 26 is, for example, about 4, and therefore, the thickness of the remaining portion 2 a of the substrate 2 remaining between the first dividing groove 25 and the second dividing groove 26 is It is about 40 m.
- the semiconductor wafer 11 is divided at the remaining portion 2a of the substrate 2 by breaking, and divided into a large number of semiconductor chips 10.
- the emission luminance can be increased by increasing the area of the semiconductor layer 3 in the divided semiconductor chip 10, and the number of semiconductor chips 10 can be increased if the area is not increased.
- the width W 2 of the second dividing groove 26 formed on the side of the substrate 2 where the semiconductor layer is not formed is made wider than the width W 1 of the first dividing groove 25 formed on the side where the semiconductor layer is formed. Therefore, as the rotary blade of the dicer forming the second dividing groove 26, a thick rotary blade having a long service life can be used. Thereby, the depth of the second dividing groove 26 is increased, the thickness of the remaining portion 2a is reduced, and braking can be facilitated. Also, replace the rotary blade. The longer the cycle, the less time is required for replacement, and the cost of the rotary blade can be reduced.
- the chip dividing method of the third embodiment shown in FIG. 7 (A) is the same as that of the second embodiment, except that the second dividing groove 26 is formed after the second dividing groove 26 is formed and before the plating.
- the second embodiment differs from the second embodiment only in that a step of forming the third dividing groove 27 having the following relationship by dicing is added.
- the third dividing groove 27 has a groove width W3 of approximately 25 m (substantially the same as the groove width W1 of the first dividing groove 25) and a depth of the second dividing groove. It is, for example, about 20 / m from the groove bottom of 26. Therefore, the thickness of the remaining portion 2a of the substrate 2 is about 20 / m.
- the breaking can be made easier, and the crack generated at the time of braking can be reduced (the second dividing groove 26 (It is narrower than the groove width.)
- the effect of being within the range of the groove width of the third dividing groove 27 is obtained, and the oblique running at the extreme end can be obtained.
- the groove sectional shape of the second dividing groove 26 is changed in the width direction.
- the second embodiment differs from the second embodiment only in that the central portion has a substantially U-shape at the deepest portion.
- the chip dividing method according to the fifth embodiment shown in FIG. 7 (C) is different from the chip dividing method according to the second embodiment only in that the groove sectional shape of the second dividing groove 26 is substantially V-shaped at the center in the width direction. This is different from the embodiment.
- the thickness of the remaining portion 2 a of the substrate 2 is the thinnest at the center in the width direction of the second dividing groove 26, so that a crack at the time of braking is reduced at the center. This has the effect of generating noise.
- FIG. 8 (A) to 8 (C) show modified examples of the above-described fifth to fifth embodiments.
- dicing is performed so as to reach the first dividing groove.
- the step of breaking the semiconductor wafer from the remaining portion as a starting point and dividing it into semiconductor chips can be omitted.
- Such dicing of the second dividing groove 26 can also be performed in the chip dividing method of the second embodiment, as shown by the dotted line in FIG. 6 (C). In this case, the step of FIG. 6 (D) becomes unnecessary.
- the semiconductor chip is not limited to a light emitting element, but may be an electronic device such as a light receiving element or a FET.
- the yield can be increased by reducing the damage to the semiconductor layer, and the processing time can be shortened to increase the efficiency. Further, an excellent effect that the apparatus cost and the processing cost can be reduced can be obtained.
- the method for dividing a semiconductor wafer into chips according to the present invention it is possible to increase the emission luminance by increasing the area of the semiconductor layer in the semiconductor chip to be divided, or to increase the number of semiconductor chips to be cut. It also has the excellent effect of being able to make braking easier.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Dicing (AREA)
- Led Devices (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/240,251 US7121925B2 (en) | 2000-03-31 | 2001-03-14 | Method for dicing semiconductor wafer into chips |
AU2001241136A AU2001241136A1 (en) | 2000-03-31 | 2001-03-14 | Method for dicing semiconductor wafer into chips |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-099896 | 2000-03-31 | ||
JP2000099895A JP2001284290A (ja) | 2000-03-31 | 2000-03-31 | 半導体ウエハーのチップ分割方法 |
JP2000-099895 | 2000-03-31 | ||
JP2000099896A JP2001284293A (ja) | 2000-03-31 | 2000-03-31 | 半導体ウエハーのチップ分割方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001075954A1 true WO2001075954A1 (fr) | 2001-10-11 |
Family
ID=26589285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/002015 WO2001075954A1 (fr) | 2000-03-31 | 2001-03-14 | Procede de decoupage d'une plaquette de semi-conducteur en puces |
Country Status (4)
Country | Link |
---|---|
US (1) | US7121925B2 (ja) |
AU (1) | AU2001241136A1 (ja) |
TW (2) | TWI257711B (ja) |
WO (1) | WO2001075954A1 (ja) |
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CN112630048A (zh) * | 2020-11-20 | 2021-04-09 | 长江存储科技有限责任公司 | 强度测量方法和样品 |
Also Published As
Publication number | Publication date |
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US20030121511A1 (en) | 2003-07-03 |
TWI257711B (en) | 2006-07-01 |
TW200529308A (en) | 2005-09-01 |
TWI295075B (ja) | 2008-03-21 |
US7121925B2 (en) | 2006-10-17 |
AU2001241136A1 (en) | 2001-10-15 |
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