WO2001023649A1 - Wafer, epitaxial filter, and method of manufacture thereof - Google Patents
Wafer, epitaxial filter, and method of manufacture thereof Download PDFInfo
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- WO2001023649A1 WO2001023649A1 PCT/JP2000/006406 JP0006406W WO0123649A1 WO 2001023649 A1 WO2001023649 A1 WO 2001023649A1 JP 0006406 W JP0006406 W JP 0006406W WO 0123649 A1 WO0123649 A1 WO 0123649A1
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- Prior art keywords
- silicon
- layer
- boron
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims description 37
- 229910052796 boron Inorganic materials 0.000 claims abstract description 162
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 161
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 159
- 239000010703 silicon Substances 0.000 claims abstract description 159
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 158
- 235000012431 wafers Nutrition 0.000 claims description 177
- 239000010410 layer Substances 0.000 claims description 137
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 61
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 51
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 49
- 239000000758 substrate Substances 0.000 claims description 45
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 41
- 238000012545 processing Methods 0.000 claims description 17
- 238000003860 storage Methods 0.000 claims description 16
- 239000002344 surface layer Substances 0.000 claims description 7
- 238000001179 sorption measurement Methods 0.000 claims description 6
- 238000004378 air conditioning Methods 0.000 claims description 4
- 230000003750 conditioning effect Effects 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 238000011109 contamination Methods 0.000 abstract description 22
- 230000008021 deposition Effects 0.000 abstract 2
- 239000010408 film Substances 0.000 description 141
- 238000005229 chemical vapour deposition Methods 0.000 description 57
- 230000015572 biosynthetic process Effects 0.000 description 21
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 16
- 238000004140 cleaning Methods 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 238000000407 epitaxy Methods 0.000 description 10
- 239000012535 impurity Substances 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 239000013078 crystal Substances 0.000 description 8
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- 238000001035 drying Methods 0.000 description 6
- 238000005498 polishing Methods 0.000 description 6
- 230000002411 adverse Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 5
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012495 reaction gas Substances 0.000 description 4
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
- 229910021419 crystalline silicon Inorganic materials 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011045 prefiltration Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- CFOAUMXQOCBWNJ-UHFFFAOYSA-N [B].[Si] Chemical compound [B].[Si] CFOAUMXQOCBWNJ-UHFFFAOYSA-N 0.000 description 1
- CTNCAPKYOBYQCX-UHFFFAOYSA-N [P].[As] Chemical compound [P].[As] CTNCAPKYOBYQCX-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001638 boron Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
-
- 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
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/16—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by purification, e.g. by filtering; by sterilisation; by ozonisation
- F24F3/167—Clean rooms, i.e. enclosed spaces in which a uniform flow of filtered air is distributed
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02367—Substrates
- H01L21/0237—Materials
- H01L21/02373—Group 14 semiconducting materials
- H01L21/02381—Silicon, silicon germanium, germanium
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02436—Intermediate layers between substrates and deposited layers
- H01L21/02439—Materials
- H01L21/02488—Insulating 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02524—Group 14 semiconducting materials
- H01L21/02532—Silicon, silicon germanium, germanium
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02612—Formation types
- H01L21/02617—Deposition types
- H01L21/0262—Reduction or decomposition of gaseous compounds, e.g. CVD
-
- 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
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02656—Special treatments
- H01L21/02658—Pretreatments
- H01L21/02661—In-situ cleaning
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
- H01L27/1262—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
- H10K77/10—Substrates, e.g. flexible substrates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a silicon wafer and an epitaxy wafer with stable quality, a method for producing them, and an air conditioner for a clean room.
- Heat treatment in the device fabrication process changes the electrical characteristics of the silicon wafer of the material due to the impurity elements in the silicon wafer and the impurity elements attached to the silicon wafer, which can cause device failures. This is becoming increasingly important with the sophistication of devices and a major challenge in device production.
- a polycrystalline silicon layer (PBS (Poly Back Seal) film) 62 is formed on the back of silicon wafer W, and the crystal existing in this PBS film is formed.
- PBS Poly Back Seal
- a method that uses grain boundaries as an absorption source for impurity elements has been put to practical use, and a so-called “Ahappi-Axial AH8” with a so-called PBS film with a PBS film formed on the back surface is used as a product.
- polon in particular, is used actively to impart P-type conductivity to silicon and adjust its conductivity to a predetermined value.
- boron adhering to the surface of the wafer on which a PBS film is to be formed is subjected to heat treatment in the PBS film formation process and the subsequent growth process of the epitaxial layer. At this time, it mainly diffuses into the PBS membrane. Also, when boron adheres to the substrate surface on which the epitaxial layer is to be grown, these boron elements diffuse from the interface between the substrate and the epitaxial layer into each of them by heating during the growth of the layer. For these reasons, a device using an epitaxial wafer having an electrical resistivity of a substrate of several ohm ⁇ cm or more may not be able to obtain predetermined characteristics.
- the backside PBS film is etched by the component gas in the growth chamber, especially at the periphery of the wafer, causing irregularities in film thickness and surface roughness.
- a silicon oxide film (CVD silicon oxide film) is further formed on the PBS film by CVD (chemical vapor deposition).
- CVD chemical vapor deposition
- FIGS. 10A and 10B are explanatory diagrams showing the manufacturing process of a conventional silicon wafer 18 with a PBS film.
- FIG. 10A shows a silicon wafer W
- FIG. 10B shows a polycrystalline silicon layer 62 on a silicon wafer W.
- (c) shows a CVD film on the polycrystalline silicon layer (PBS film) 62 on the back surface of the silicon wafer W (b) to prevent the above-mentioned etching in the next epitaxial layer growth step.
- (D) is a state in which the polycrystalline silicon layer 62 on the surface of the silicon wafer 18 is removed by mirror polishing, and (e) is a silicon wafer from the state of (d). The state in which the epitaxial layer 66 is formed on the surface of the wafer is shown.
- air filters used in conventional cleanrooms for cleaning semiconductor wafers for example, cleaning, transport, storage, film formation, etc. (including cleaning machines, wafer storage, film formation equipment, etc.) are generally used. It is known that it is made of glass fiber, and if corrosive gas such as hydrogen fluoride gas is present in the atmosphere during the process of step 18, boron is eluted into the atmosphere due to this adhesion.
- FIG. 11 the configuration shown in Figure 11 is used for air conditioning in a clean room.
- reference numeral 12 denotes an air conditioner constituting a clean room 14, and various wafer processing chambers are provided in the clean room 14.
- a CVD processing chamber 16 A CVD furnace chamber 18, a PBS film forming chamber 20, and a PBS furnace chamber 22 are provided.
- Each of the chambers 16, 18, 20, 20 and 22 has one or more air inlets.
- Each air inlet has an air filter 16a, 16b, 18a. , 20 a, 20 b, and 22 a are installed.
- the CVD processing chamber 16 is provided with a pre-CVD processing washing machine 24, a dryer 26, and a clean booth 28 for storage.
- the CVD furnace body room 18 is provided with a CVD device 30.
- the PBS film forming chamber 20 is equipped with a pre-PBS film forming washing machine 32, a dryer 34, and a storage clean room. —Six thirty six have been deployed.
- 83 devices 3 8 are arranged in the PBS furnace body room 2,?
- the air inlets of the above devices 24, 26, 28, 30, 30, 32, 34, 36, 38 have air filters 24a, 26a, 28a, 30a, 30a, 32 a, 34 a, 36 a, and 38 a are installed.
- Reference numeral 39 denotes an air discharge space provided downstream of the clean room 14.
- the air discharge space 39 is connected to a recovery pipe 43.
- an air conditioner 40, an impurity removing device 42, and an air conditioner 44 are arranged in series from the upstream to the downstream.
- the external conditioner 40 and the impurity removing device 42 are connected by a first air pipe 46, and the impurity removing device 42 and the air conditioner 44 are connected by a second air pipe 48.
- Each of the air conditioner 44 and the air filters 16a, 16b, 18a, 20a, 20a, 2Ob, 22a installed at the air inlet of each room of the clean room 14 described above. are connected by a third air pipe 50.
- the air conditioner 40 has a roll filter 99 on the air inflow side, a medium performance filter 52, and a fan 54 on the air outflow side.
- the impurity removing device 42 is composed of a chemical filter for removing NOX and SOx.
- the air conditioner 44 has a fan 56 on the air inlet side, a prefill 98 next, and a medium-performance filter 58 on the air outlet side.
- outside air passes through the outside air conditioner 40, the impurity remover 42, and the air conditioner 44, and then passes through each air filter 16a, Through the 16b, 18a, 20a, 20b, and 22a, the inside of the CVD processing chamber 16, the CVD furnace main body 18, the PBS film forming chamber 20, and the PBS furnace main body 22 It is introduced to it.
- the CVD process generally supplies one or several kinds of compound gas or simple gas constituting the thin film material onto the wafer, and performs a chemical reaction on the gas phase or on the surface of the thin film to obtain a desired thin film.
- a PBS film It can be applied as a process to prevent etching and autodoping of the PBS film in the epitaxial process by depositing silicon oxide on the surface.
- the air introduced into each room is supplied to the washer 24 via the air filter 24a, further to the dryer 26 via the air filter 26a, and stored for storage via the air filter 28a.
- To the lean booth 28 to the CVD device 30 via the air filter 30a, to the PBS pre-cleaner 32 via the air filter 32a, and to the dryer 34 via the air filter 34a.
- the exhaust is partially exhausted directly from the washer 24, 32, and the entire amount is exhausted from the CVD device 30.
- the air discharged into the air discharge space 39 is about 80% of the entire supply amount, is returned to the second air pipe 48 through the recovery pipe 43, and is reused.
- the air filters 16a, 16b, 18a, 20a, 20b, 22a, 24a, 26a, 28a a, 30a, 32a, 34a, 36a, 38a are usually ULPA filters (eg, NMO-320 from Nippon Inorganic Co., Ltd.) .
- the ULPA filter not only has no function of removing boron, but may release boron.
- medium-performance filters 52 and 58 for example, ASTC-56-95 made by Nippon Inorganic Co., Ltd.
- boron-less filters air filters that do not emit boron
- boron adsorbed fillers boron adsorbing fillers
- these fillers are used effectively to efficiently reduce the amount of boron adhering to 18 to a predetermined value or less.
- no good measures have been proposed yet.
- documents referring to the adverse effects of boron in the atmosphere in the clean room in the production of bonded substrates they point out the difficulty of realizing specific removal facilities (see, for example, Patent No. 27). It does not mention effective removal of polon and control of the amount of polon in the atmosphere in the clean room within a predetermined range.
- the present inventors attempted to solve the problems of the polon concentration in the atmosphere with which the e-aperture was in contact and the We quantitatively grasped the relationship between the amount of polon adhering to the surface of the wafer and experimentally clarified the amount of polon adhering and its effect on the distribution of polon concentration in various products. Based on this, we succeeded in stably producing silicon wafers and epitaxy wafers that suppressed the contamination of pol- omnes from the environment and did not adversely affect device characteristics.
- a first object of the present invention is to provide a silicon wafer, an epitaxy wafer, and a method for effectively manufacturing the silicon wafer, which has a stable quality and suppresses the contamination of pollon from the environment and does not adversely affect the device characteristics.
- the present inventors have proposed the use of air in a clean room (including a cleaning machine, a wafer storage, a film forming apparatus, etc.). Dissolve in pure water with an impinger and analyze it by ICP-MS (Inductively Coupled Plasma Mass Spectrometry) to measure the boron concentration in the atmosphere and adsorb this boron concentration and the wafer. As a result of intensive studies on the relationship between polon concentrations, a certain relationship was found between the two. It was found that they existed, and succeeded in reducing the boron concentration in the clean room atmosphere to a predetermined concentration or less.
- ICP-MS Inductively Coupled Plasma Mass Spectrometry
- a second object of the present invention is to provide an air conditioner, a clean room, and a clean room air conditioner capable of inexpensively preventing polon contamination on the surface. Disclosure of the invention
- a first aspect of the silicon wafer of the present invention is characterized in that the amount of adhered polon on the surface is 1 ⁇ 10 atoms / cm 2 or less.
- the increment of the boron concentration in the surface layer up to a depth of 0.5 ⁇ m with respect to the concentration of boron in the bulk silicon immediately below the surface layer is 1 ⁇ 10 15 atoms. / cm 3 or less.
- the concentration of polon in the 1 m-wide interface near layer including the interface between the polycrystalline silicon layer and the single-crystal silicon layer has a concentration of polon in the silicon circumscribing the interface near layer.
- the first aspect of silicon E pita press roux E one tooth of the present invention characterized by having i is less polycrystalline layer on one main surface, A silicon epitaxial layer having a polycrystalline silicon layer on the back surface of a single-crystal silicon substrate, and the boron concentration in a layer near the interface of 1 m width including the interface between the single-crystal silicon and the polycrystalline silicon layer of the substrate. It is characterized in that the increment with respect to the concentration of polon in the substrate silicon circumscribing the neighboring layer is 1 ⁇ 10 15 atoms / cm 3 or less.
- a fourth aspect of the silicon wafer of the present invention is that the single crystal silicon layer having a boron concentration within 0.5 m near the interface with the CVD silicon oxide film is in contact with the layer.
- a second aspect of the present invention is a silicon epitaxial wafer having a CVD silicon oxide film on the back surface of the substrate, wherein the single crystal silicon substrate is in the vicinity of the interface with the CVD silicon oxide film.
- the increase in the boron concentration with respect to the boron concentration in the substrate silicon in contact with the layer is 1 ⁇ 10 atoms / cm 3 or less.
- the boron concentration in the polycrystalline layer is preferably 5 ⁇ 10 ′′ atoms / cm 3 or less, more preferably 3 ⁇ 10 14 atoms. / cm 3 or less, most preferably 1 ⁇ 10 ”atoms / cm 3 or less.
- the increment of the boron concentration in the 1 m wide interface near layer including the interface between the polycrystalline silicon layer and the single crystal silicon layer with respect to the boron concentration in the silicon circumscribing the interface near layer is 1 x 1 0 'and the 5 atoms / cm 3 or less, circumscribing the near near the multi-crystal silicon layer of Poron concentration near the interface polycrystalline silicon layer of width 0.5 m including the interface between the silicon oxide film and the polycrystalline silicon layer
- the increase with respect to the concentration of polon in the polycrystalline silicon is 1 ⁇ 10 15 atoms / cm 2 : i or less.
- a third aspect of the silicon epitaxial wafer of the present invention is a silicon epitaxial wafer having a polycrystalline silicon layer on the back surface of the substrate and a CVD silicon oxide film on the polycrystalline silicon layer. Increase in the boron concentration in the 1 m wide interface layer including the interface between the crystalline silicon layer and the single crystal silicon layer with respect to the boron concentration in the silicon circumscribing the interface layer.
- the above silicon wafer is particularly effective for products in which the concentration of boron in the bulk of single crystal silicon is 1 ⁇ 10 16 atoms / cm 3 or less.
- the above silicon wafer is particularly effective for products having a boron concentration of 1 ⁇ 10 atoms / cnr 1 or less in a substrate.
- treatment such as treatment and storage is performed in an atmosphere having a boron concentration of 15 ng / m 3 or less.
- the concentration of polon is 15 ng / m 3 or less in an atmosphere. It is characterized by handling such as processing and storage.
- a second aspect of the method for manufacturing a silicon wafer according to the present invention is characterized in that, in manufacturing the above-described silicon wafer, the polycrystalline silicon layer is formed in an atmosphere having a boron concentration of 15 ng / m 3 or less.
- a polycrystalline silicon layer is formed in an atmosphere having a polon concentration of 15 ng / m : i or less. It is characterized by
- the CVD silicon oxide film is formed in an atmosphere having a boron concentration of 15 ng / in : i or less. It is characterized by the following.
- a third embodiment of the method for producing a silicon epitaxial wafer according to the present invention is as follows.
- the CVD silicon oxide film is formed in an atmosphere having a polon concentration of 15 ng / m 3 or less.
- a polycrystalline film is formed on a surface in which the amount of attached boron is suppressed to 1 ⁇ 10 1 G atoms / cin 2 or less. Forming a layer.
- the amount of adhered porone is suppressed to 1 ⁇ 10 atoms / cm 2 or less. It is characterized in that a polycrystalline layer is formed on the formed surface.
- the atmosphere adjusting equipment of the present invention is characterized in that the concentration of polon in the atmosphere is 15 ng / m 3 or less.
- the clean room of the present invention is characterized in that the clean room atmosphere has a boron concentration of 15 ng / m 3 or less.
- An air conditioner for a clean room includes an air conditioner having a boron-less filter and a boron adsorption filter, and one or a plurality of wafer processing devices having a boron-less filter. It is characterized in that it is configured to circulate between the lean room and the wafer processing device.
- the internal pressure of the e-aerator is higher than the internal pressure of the clean room, and the internal pressure of the clean room is adjusted to be higher than the external pressure.
- the external pressure refers to the pressure in the service room (room used for changing clothes, loading and unloading products, etc.) and corridors outside the clean room, and is also called the external pressure.
- the method for producing the AHA according to the present invention is characterized in that the above-described AHA is manufactured by using the above-described clean room air conditioner.
- FIG. 1 is a flowchart showing a method for manufacturing a silicon wafer and a silicon epitaxial wafer according to the present invention.
- FIGS. 2A and 2B are explanatory views showing the steps of manufacturing the silicon wafer and the silicon epitaxial wafer of the present invention.
- FIG. 2A shows a silicon wafer
- FIG. 2B shows a polycrystalline silicon layer on the silicon wafer.
- C) is a state in which a CVD silicon oxide film is further formed on the polycrystalline silicon layer (PBS film) on the back of the silicon wafer in (b)
- PBS film polycrystalline silicon layer
- (d) is a silicon wafer.
- E) shows the state in which the polycrystalline silicon layer on the surface is removed, and (e) shows the state in which an erbaxial layer is formed on the surface of the silicon wafer from the state in (d).
- FIG. 3 is a schematic explanatory diagram showing a clean room air conditioner of the present invention.
- FIG. 4 is a graph showing the concentration of polon in the sample in the depth direction of the sample in Example 1.
- FIG. 5 is a graph showing the boron concentration in the sample in the depth direction of the sample in Comparative Example 1.
- FIG. 6 is a graph showing the concentration of polon in a sample in the depth direction of the sample in Example 2.
- FIG. 7 is a graph showing the concentration of polon in the sample in the depth direction of the sample in Comparative Example 2.
- Figure 8 shows the concentration of polon in the sample in the depth direction of the sample in Comparative Example 3. It is a graph which shows a degree.
- FIG. 9 is a graph showing the boron concentration in the sample in the depth direction of the sample in Comparative Example 4.
- FIGS. 10A and 10B are explanatory views showing a manufacturing procedure of a conventional silicon wafer and a silicon epitaxial wafer 18, in which (a) is a silicon wafer, (b) is a state in which a polycrystalline silicon layer is formed on the silicon wafer, c) shows a state in which a CVD silicon oxide film is further formed on the polycrystalline silicon layer (PBS film) on the back of the silicon wafer in (b), and (d) shows a polycrystalline silicon layer on the surface of the silicon wafer. (E) shows a state in which an erbaxial layer is formed on the surface of the silicon wafer from the state in (d).
- FIG. 11 is a schematic explanatory view showing an example of a conventional clean room air conditioner.
- FIG. 12 is a graph showing the relationship between the wafer leaving time and the amount of wafer attached in Experimental Example 2.
- FIG. 13 is a graph showing the relationship between the concentration of boron in the environmental atmosphere and the amount of boron deposited on the silicon wafer surface in Experimental Example 3.
- FIGS. 1 to 3 in the accompanying drawings.
- the embodiments are exemplarily illustrated, and various modifications may be made without departing from the spirit of the present invention. It goes without saying that deformation is possible.
- Figure 1 shows an example of various silicon wafer manufacturing methods according to the present invention.
- FIG. 2 is a flowchart showing a method for manufacturing a silicon epitaxial wafer with an S film
- FIG. 2 is an explanatory view showing a manufacturing procedure of the epitaxial wafer.
- reference numeral 100 denotes a silicon wafer manufacturing process, which is a substrate for an epitaxial wafer.
- the silicon single crystal ingot is subjected to slice, chamfer, wrap, etching, annealing, etc. by a conventional method. Silicon 18 W is manufactured.
- the cleaning, drying, and storage (packing) processes after the mirror polishing are performed in an extremely low clean room where the concentration of polon in the atmosphere described below is 15 ng / m 3 or less.
- the amount of boron deposited in the surface layer up to 1 ⁇ 10 10 atoms / cm 2 or a depth of up to 0.5 ⁇ m is increased by 1 ⁇ with respect to the boron concentration in the bulk silicon immediately below the surface layer. It is possible to obtain a silicon wafer free from polon contamination of less than 10 15 a toms / cm 3 .
- PBS film forming process such as vacuum degree 0. 2; decomposing the S i H 4 ingredients in L Torr, 6 0 0 ⁇ 7 0 0 ° C, the multi on the substrate Shirikonwe one tooth Crystalline silicon is deposited, and the thickness is 0.5 ⁇ 2 ⁇ 111? 83 film 62 is formed.
- the present invention is characterized in that the PBS film forming step is performed in an extremely low clean room in which the concentration of polon in the atmosphere described later is 15 ng / m 3 or less. As a result, boron contamination at the interface 70 between the silicon wafer W and the polycrystalline silicon layer (PBS film) 62 can be suppressed.
- the silicon wafer W can be taken out at this stage.
- the boron contamination at the interface 70 is suppressed, that is, the concentration of boron in the 1 m wide interface near layer including the interface between the polycrystalline silicon layer and the single crystal silicon layer is set to the value of Boron concentration It is possible to obtain a silicon wafer W provided with a polycrystalline silicon layer 62 whose increment with respect to the degree is 1 ⁇ 10 15 atonis / cm 3 or less (FIG. 2 (b)
- the obtained silicon wafer W is obtained by increasing the boron concentration in the layer near the interface having a width of 1 including the interface between the polycrystalline silicon layer and the single crystal silicon layer with respect to the boron concentration in the silicon circumscribing the layer near the interface.
- the present invention cleaning after the mirror polishing, drying, storage (packaging) process boron concentration in the atmosphere to be described later in the vicinity of the surface and surface by performing in a very low clean room that 1 5 n gZm 3 below
- a silicon wafer with a polycrystalline silicon layer without boron contamination can be obtained.
- the obtained silicon wafer W has a reduced polon concentration in the vicinity of the interface between the polycrystalline silicon layer and the single-crystal silicon layer, as well as a reduced polon concentration in at least a part of the polycrystalline silicon layer 62. It has a polycrystalline layer of 5 ⁇ 10 1 toms / cm 3 or less on the back surface.
- the step of forming the VD silicon oxide film for example, using the S i H 4 and oxygen under atmospheric pressure 3 8 0 ⁇ 5 0 0 ° C , the back side of Shirikonwe one tooth W PBS film 6 Silicon oxide is deposited on 2 to form a CVD silicon oxide film 64 having a thickness of 0.2 to 2 ⁇ m [FIG. 2 (c)].
- the feature of the present invention is that the step of forming the CVD silicon oxide film is performed in a clean room in which the concentration of boron in the atmosphere described later is as extremely low as 15 ng / m 3 or less.
- the interface 7 between the PBS film 62 and the CVD silicon oxide film 64 (2) In other words, the boron concentration in the vicinity of the interface having a width of 0.5 ⁇ m including the interface between the CVD silicon oxide film and the polycrystalline silicon layer circumscribes the neighboring polycrystalline silicon layer. It is possible to make the increment with respect to the porosity in polycrystalline silicon not more than 1 ⁇ 10 atoms / cni 3 .
- the PBS film forming step 102 can be omitted, and the CVD silicon oxide film 64 can be directly formed on the back side of the silicon wafer W according to the method of the present invention.
- the increment of the boron concentration in the single-crystal silicon layer within 0.5 m near the interface with the CVD silicon oxide film with respect to the boron concentration in the bulk silicon in contact with the layer is 1 ⁇ 10 15 atonis / It has a CVD silicon oxide film having a size of not more than cm 3 on the back surface. It is also possible to form an epitaxial layer by forming an epitaxial layer on this wafer.
- the increment of the boron concentration in the single crystal silicon substrate within 0.5 m near the interface with the CVD silicon oxide film with respect to the boron concentration in the substrate silicon in contact with the layer is lxl 0 15 atoms / cm 3 or less.
- 106 is an epitaxial layer growth step, in which after removing the polycrystalline silicon layer 62 on the surface of the silicon substrate W by, for example, mirror polishing (FIG. 2 (d)), a PBS film 62 and a CVD silicon oxide film 6 4 Shirikonwe one tooth W Epitakisharu surface, for example, atmospheric pressure and 1000 to 1200 ° C of S i HC 1 3 and a mixed gas of flowed thickness of H 2. 3 to 1 5 ⁇ Paiiota of having Layer 6 is formed.
- Reference numeral 108 denotes an epitaxy wafer removal step with a backside PBS film, and an epitaxy wafer 68 with a backside PBS film with minimized boron contamination can be obtained (FIG. 2 (e)). ].
- FIG. 3 the same or similar components as those in FIG. 11 are denoted by the same reference numerals, and the description of the components and operations will not be repeated.
- the clean room air conditioner 12a of the present invention shown in FIG. 3 has exactly the same configuration as the conventional clean room air conditioner 12 shown in FIG. 11 except for the filter configuration. For, the description will not be repeated unless necessary.
- the eyes of the clean room air conditioner 12a of the present invention are the air filters 16a, 16b, 18a, 20a, 20b, 22a, 24 in the conventional facility 12.
- a, 26 a, 28 a, 30 a, 32 a, 34 a, 36 a, 38 a instead of polonless filler 16 x, 16 y, 18 x, 20 ,, 20 y, 22 ⁇ , 24 ⁇ , 26,, 28 ⁇ , 30 ⁇ , 32 ⁇ , 34 ⁇ , 36 ⁇ , 38 ⁇
- a boron-less medium-performance filter 52 2 58 ⁇ was used, and instead of a pre-filter 98, a roll filter 990, a boron-less pre-filter 98 ⁇ , and a boron-less filter 1 filter Using 9 9 mm, a boron-absorbing filter 4 O x is provided downstream of the medium-quality boron-free filter 52 of the outside air conditioner 40, and a medium-size boron-free
- a boron adsorption filter 44 X was installed in the system.
- the outside air passes through the outside air conditioner 40, the impurity remover 42, and the air conditioner 44, and then the boronless filters 16.
- x, 16 y, 18 x, 20 x, 20 y, 22 x via CVD processing chamber 16, CVD furnace body chamber 18, PBS film formation chamber 20, PBS furnace body Each of them is introduced into the interior of chamber two two.
- the air introduced into each chamber is supplied to the washer 24 via the boron-less filter 24 X, further to the dryer 26 via the boron-less filter 26 X, and to the dryer 26 via the boron-less filter 28 x.
- To the clean booth for storage 28 to the CVD device 30 through the polonless filter 3 Ox, to the PBS pre-washing machine 32 through the boronless filter 32X, and to the boronless filter 34X.
- the dryer 34 Through the dryer 34, through the boronless filter 36X to the storage clean boot 36, and through the boronless filter 38x into the PBS device 38, and finally exhaust air. It is discharged to space 39.
- the air that has reached the air discharge space 39 becomes about 80% of the entire supply amount, returns to the second air pipe 48 through the recovery pipe 43, and is reused.
- the boron-free air filters 16X, 16y, 18X, 20 ⁇ , 20y, and 22x specifically include a boron-free ULPA filter (ATMM manufactured by Nippon Inorganic Co., Ltd.).
- boron-less neutral performance filters 52x and 58x are boron-less neutral performance filters (Nippon Inorganic Co., Ltd., EML-56- 90) and boronless roll filter 990x (DSR—340 R—TH—C manufactured by Nippon Inorganic Co., Ltd.) 9
- boron adsorption filters 40x and 44x boron adsorption filters (ASC-31-Q-b, manufactured by Nippon Inorganic Corporation) may be used.
- the air volume of the external controller is 700 OmVhr, and the pressure is relative to atmospheric pressure.
- set 0 mm H 2 O have high pressure was measured boron concentration across the filter.
- the concentration of Polon in the air after filtering was controlled to 15 ng / m 3 or less in each case.
- the number of particles in the clean room was 0.
- ICP Magnetic resonance analysis
- MS Inductively coupled plasma mass spectrometry
- PLASMATRACE 2 manufactured by MICROMASS
- the boron concentration in the air was calculated by multiplying the measured value by the measured liquid volume to obtain the mass, and dividing the mass by the sampled air volume.
- Silicon wafer diameter 200 mm, CZ_P type, 8-15 ⁇ cm, crystal axis ⁇ 100>
- a PBS film was formed using the same sample as in Example 1 under the same conditions.
- the measurement of the boron concentration in the sample was performed in the same manner as in Example 1, and the results are shown in FIG.
- the difference between the boron concentration distributions in Fig. 4 and Fig. 5 indicates the effect of boron contamination based on the difference in the concentration of boron in the atmosphere.In Fig. 5, the boron concentration in the PBS film rises sharply near the interface.
- Silicon wafer diameter 200 mm, CZ—P type, 8—15 ⁇ ⁇ cm, crystal axis ⁇ 100>
- SC-1 ammonia, hydrogen peroxide, water
- SC-2 hydrochloric acid, hydrogen peroxide, water
- Epitaxial treatment (temperature) 110 ° C, (time) 10 minutes, (reaction gas) 1Trichlorosilane ⁇ ⁇ ⁇ hydrogen, (film thickness) 5.0
- boron was diffused from the substrate single crystal silicon into the PBS film by heating during the formation of the epitaxial film, but the boundary between the PBS film and the substrate single crystal silicon was observed.
- the concentration of the pore during a width of 1 m is about 6 x 10 M atoms / cm : i
- the boron concentration in the circumscribed PBS film (about 1 x 10 atoms / cm ; i ) increases the 1 x 1 0 'less than 5 atoms / cm 3
- boron concentration in the single crystal silicon circumscribing approximately 1 X 1 0 15 atoins / cm : good Rimushiro low boron during processing ⁇ et Doha It was confirmed that the level of contamination was kept low.
- Example 2 In a conventional atmosphere (boron concentration : 50 to 80 ng / m :! ), a PBS film was formed using the same sample as in Example 2 under the same conditions. In a clean room atmosphere (boron concentration: 4 to 13 ng / m 3 ), a CVD silicon oxide film was formed under the same conditions as in Example 2, and thereafter an epitaxial film was grown. After dissolving and removing the CVD silicon oxide film on the backside with a 20% HF solution, the concentration of boron in the sample PBS film and the substrate single-crystal silicon was measured in the same manner as in Example 1. It was shown to. As is clear from FIG.
- the thickness of the PBS film is 0 ⁇ m, that is, the boron concentration at the boundary with the CVD silicon oxide film is 4 ⁇ 10 ”atoms / cm 3 , and the boron concentration in the atmosphere during the CVD silicon oxide film formation stage is 1 As a result of suppressing the concentration to 5 ng / m 3 or less, it is shown that the concentration of the boron in the PBS film is suppressed to a value close to 1 ⁇ 10 ”atoms / cm 3 . (Comparative Example 3: PBS film formation under the atmosphere of Experimental Example 1 + CVD treatment under the conventional atmosphere)
- the pol- lone adhering in the atmosphere with high boron concentration diffused into the PBS film from the interface (depth 0 ⁇ ) in the interface between the PBS film and the CVD silicon oxide film.
- the average concentration of boron up to a depth of 0.5 m is as high as 2 ⁇ 10 15 atoms / cni 3, and the average concentration of boron in a PBS film having a depth of 0.5 m or more is about 8 ⁇ 10 14 It is greatly increased with respect to atoms / cm 3 .
- the boron concentration in the l ⁇ m width including the boundary between the PBS film and the substrate single-crystal silicon was reduced.
- the average concentration was approximately 1. 5 X 1 0 atoms / cm 3, are suppressed to an average concentration (about 2 X 1 0 15 atoms / cm 3) following values of boron in the single crystal divorced circumscribing .
- the amount of boron adhering to the substrate single-crystal silicon surface is so small that it hardly affects the predetermined porosity, and the amount of boron diffused from this interface into the PBS film at the time of the formation of the PBS film is also low. Is known to have little effect on
- the boron concentration in the PBS film depends on the diffusion of adhering boron from the boundary between the PBS film and the substrate single crystal silicon, and the interface between the CVD silicon oxide film and the PBS film (depth 0 mm in the figure). m), the value was higher by about one order of magnitude compared to Figures 7 and 8.
- the average concentration of boron (approximately 4 ⁇ 10 15 atoins / cm 3 ) in the width l ⁇ m including the boundary between the PBS film and the substrate single-crystal silicon is the average concentration of boron in the circumscribed substrate single-crystal silicon ( about 1.5 to 5 X 1 0 15 atoms / cm 3), it has increased approximately 2. 5 x 1 0 15 atoms / cm 3 also.
- the boron concentration in the PBS film formed by suppressing the boron concentration in the atmosphere to 15 ng / nr 'or less was at least 3 ⁇ 1 in at least a part of the film. It is known that it is 0 "atoms / cm 3 or less.
- the vertical line at the center is the interface
- the left side of the interface is the PBS film
- the right side is the substrate single crystal silicon.
- reference numeral 120 indicates the diffusion direction of boron in the epitaxial layer growth step.
- the pressure was set to mH 20 higher, and the concentration of Polon in the air before and after the filling was measured in the same manner as in Example 1. The results are shown in Table 2.
- the concentration of Polon in the environmental atmosphere is less than 15 ng / m : i Then, it was found that the amount of adhered polon on the wafer surface was suppressed to 1 ⁇ 10 1 B atoms / cni 2 or less.
- the surface, the PBS film, the substrate single crystal silicon, the PBS film and the CVD silicon oxide film, and the interface between the substrate single crystal silicon and the epitaxy layer Since the amount of boron contamination is suppressed to a predetermined concentration or less, the effect is achieved that the quality is stable and the device characteristics are not adversely affected.
- the silicon wafer and the silicon epitaxial wafer having stable quality of the present invention can be manufactured inexpensively and efficiently. There are advantages.
- the concentration of boron in the atmosphere and the atmosphere of the clean room is controlled to a desired concentration or less, so that the adhesion of boron on the wafer can be extremely suppressed.
- the concentration of boron in the clean room atmosphere can be significantly reduced, and various silicon wafers or epitaxy wafers in which contamination by boron is suppressed can be provided. The effect of stable production is achieved.
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Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP00961105.4A EP1143047B1 (en) | 1999-09-29 | 2000-09-20 | Method of manufacturing silicon wafer |
US09/856,139 US8273146B1 (en) | 1999-09-29 | 2000-09-20 | Wafer and epitaxial wafer, and manufacturing processes therefor |
KR1020017003434A KR100774066B1 (ko) | 1999-09-29 | 2000-09-20 | 웨이퍼, 에피택셜웨이퍼 및 이들의 제조방법 |
US13/565,423 US9163327B2 (en) | 1999-09-29 | 2012-08-02 | Silicon wafer and a silicon epitaxial wafer having a polycrystal silicon layer formed on a major surface including boron concentration of the polycrystal silicon layer being 1×1015 atom/cm3 or less |
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JP27725599 | 1999-09-29 | ||
JP11/277255 | 1999-09-29 |
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US09/856,139 A-371-Of-International US8273146B1 (en) | 1999-09-29 | 2000-09-20 | Wafer and epitaxial wafer, and manufacturing processes therefor |
US13/565,423 Division US9163327B2 (en) | 1999-09-29 | 2012-08-02 | Silicon wafer and a silicon epitaxial wafer having a polycrystal silicon layer formed on a major surface including boron concentration of the polycrystal silicon layer being 1×1015 atom/cm3 or less |
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US (2) | US8273146B1 (ja) |
EP (1) | EP1143047B1 (ja) |
KR (1) | KR100774066B1 (ja) |
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DE10250915B4 (de) * | 2002-10-31 | 2009-01-22 | Osram Opto Semiconductors Gmbh | Verfahren zur Abscheidung eines Materials auf einem Substratwafer |
JP5609025B2 (ja) | 2009-06-29 | 2014-10-22 | 株式会社Sumco | エピタキシャルシリコンウェーハの製造方法 |
US20140087649A1 (en) * | 2012-09-26 | 2014-03-27 | Shenzhen China Star Optoelectronics Technology Co. Ltd. | Cleanroom and Cleaning Apparatus |
CN108139109B (zh) * | 2015-07-29 | 2021-09-21 | 莫比安尔私人公司 | 能实现零能量加热、通风、空调操作的方法和设备 |
JP6770720B2 (ja) * | 2017-10-27 | 2020-10-21 | 信越半導体株式会社 | エピタキシャルウェーハの製造方法 |
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JPH05259147A (ja) * | 1992-03-16 | 1993-10-08 | Fujitsu Ltd | 半導体装置の製造方法 |
JPH10308373A (ja) * | 1995-11-08 | 1998-11-17 | Mitsubishi Materials Shilicon Corp | シリコンウエ−ハおよびその洗浄方法 |
JP2000300919A (ja) * | 1999-04-21 | 2000-10-31 | Nippon Muki Co Ltd | エアフィルタ |
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JPS62208638A (ja) * | 1986-03-07 | 1987-09-12 | Toshiba Corp | 半導体装置の製造方法 |
GB8611094D0 (en) | 1986-05-07 | 1986-06-11 | Laporte Industries Ltd | Wood preservative compositions |
US5626820A (en) * | 1988-12-12 | 1997-05-06 | Kinkead; Devon A. | Clean room air filtering |
DE69333751T2 (de) | 1992-07-30 | 2005-12-29 | Akzo Nobel N.V. | Nicht-verbreitendes lebendes herpesvirusvakzin |
JP2723787B2 (ja) * | 1993-08-20 | 1998-03-09 | 信越半導体株式会社 | 結合型基板の製造方法 |
TW273574B (ja) * | 1993-12-10 | 1996-04-01 | Tokyo Electron Co Ltd | |
EP0785013B1 (en) * | 1995-07-27 | 2005-05-04 | Taisei Corporation | Air filter |
US6228166B1 (en) * | 1996-11-20 | 2001-05-08 | Nec Corporation | Method for boron contamination reduction in IC fabrication |
JPH11251207A (ja) * | 1998-03-03 | 1999-09-17 | Canon Inc | Soi基板及びその製造方法並びにその製造設備 |
US6102977A (en) * | 1998-06-18 | 2000-08-15 | Seh America, Inc. | Make-up air handler and method for supplying boron-free outside air to clean rooms |
TW444266B (en) * | 1998-07-23 | 2001-07-01 | Canon Kk | Semiconductor substrate and method of producing same |
-
2000
- 2000-09-20 US US09/856,139 patent/US8273146B1/en active Active
- 2000-09-20 WO PCT/JP2000/006406 patent/WO2001023649A1/ja active Application Filing
- 2000-09-20 EP EP00961105.4A patent/EP1143047B1/en not_active Expired - Lifetime
- 2000-09-20 KR KR1020017003434A patent/KR100774066B1/ko active IP Right Grant
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US8273146B1 (en) | 2012-09-25 |
US9163327B2 (en) | 2015-10-20 |
KR20010088807A (ko) | 2001-09-28 |
KR100774066B1 (ko) | 2007-11-06 |
EP1143047A1 (en) | 2001-10-10 |
US20120298995A1 (en) | 2012-11-29 |
TW471074B (en) | 2002-01-01 |
EP1143047B1 (en) | 2015-11-04 |
EP1143047A4 (en) | 2006-08-23 |
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