CA2095449A1 - Supersaturated Rare Earth Doped Semiconductor Layers by Chemical Vapor Deposition - Google Patents
Supersaturated Rare Earth Doped Semiconductor Layers by Chemical Vapor DepositionInfo
- Publication number
- CA2095449A1 CA2095449A1 CA2095449A CA2095449A CA2095449A1 CA 2095449 A1 CA2095449 A1 CA 2095449A1 CA 2095449 A CA2095449 A CA 2095449A CA 2095449 A CA2095449 A CA 2095449A CA 2095449 A1 CA2095449 A1 CA 2095449A1
- Authority
- CA
- Canada
- Prior art keywords
- rare earth
- supersaturated
- erbium
- semiconductor layers
- doped semiconductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052761 rare earth metal Inorganic materials 0.000 title abstract 4
- 150000002910 rare earth metals Chemical class 0.000 title abstract 3
- 239000004065 semiconductor Substances 0.000 title abstract 3
- 238000005229 chemical vapour deposition Methods 0.000 title 1
- 238000000034 method Methods 0.000 abstract 4
- 229910052691 Erbium Inorganic materials 0.000 abstract 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 abstract 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 2
- 229910052710 silicon Inorganic materials 0.000 abstract 2
- 239000010703 silicon Substances 0.000 abstract 2
- 239000000758 substrate Substances 0.000 abstract 2
- POILWHVDKZOXJZ-ARJAWSKDSA-M (z)-4-oxopent-2-en-2-olate Chemical compound C\C([O-])=C\C(C)=O POILWHVDKZOXJZ-ARJAWSKDSA-M 0.000 abstract 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 abstract 1
- 238000000151 deposition Methods 0.000 abstract 1
- 229910000078 germane Inorganic materials 0.000 abstract 1
- 230000005693 optoelectronics Effects 0.000 abstract 1
- 239000002243 precursor Substances 0.000 abstract 1
- -1 rare earth compound Chemical class 0.000 abstract 1
- 229910000077 silane Inorganic materials 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/0248—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies
- H01L31/0256—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by their semiconductor bodies characterised by the material
- H01L31/0264—Inorganic materials
- H01L31/028—Inorganic materials including, apart from doping material or other impurities, only elements of Group IV of the Periodic System
- H01L31/0288—Inorganic materials including, apart from doping material or other impurities, only elements of Group IV of the Periodic System characterised by the doping material
-
- 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 at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/22—Diffusion of impurity materials, e.g. doping materials, electrode materials, into or out of a semiconductor body, or between semiconductor regions; Interactions between two or more impurities; Redistribution of impurities
- H01L21/223—Diffusion of impurity materials, e.g. doping materials, electrode materials, into or out of a semiconductor body, or between semiconductor regions; Interactions between two or more impurities; Redistribution of impurities using diffusion into or out of a solid from or into a gaseous phase
-
- 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
- H01L21/02518—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
- H01L21/02518—Deposited layers
- H01L21/0257—Doping during depositing
- H01L21/02573—Conductivity type
- H01L21/02581—Transition metal or rare earth elements
-
- 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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System 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
- H01L21/205—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy using reduction or decomposition of a gaseous compound yielding a solid condensate, i.e. chemical deposition
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S252/00—Compositions
- Y10S252/95—Doping agent source material
- Y10S252/951—Doping agent source material for vapor transport
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S438/00—Semiconductor device manufacturing: process
- Y10S438/914—Doping
- Y10S438/918—Special or nonstandard dopant
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Electromagnetism (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Vapour Deposition (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
A CVD process for producing a rare earth-doped, epitaxial semiconductor layer on a substrate is disclosed. The process utilizes a silane or germane and a rare earth compound in the gas phase. By this method single phase, rare earth-doped semiconductor layers, supersaturated in the rare earth, are produced. The preferred rare earth is erbium and the preferred precursors for depositing erbium by CVD are erbium hexafluoroacetylacetonate, acetylacetonate, tetramethylheptanedionate and flurooctanedionate. The process may be used to produce optoelectronic devices comprising a silicon substrate and an erbium-doped epitaxial silicon film.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/940,416 US5322813A (en) | 1992-08-31 | 1992-08-31 | Method of making supersaturated rare earth doped semiconductor layers by chemical vapor deposition |
US940,416 | 1992-08-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2095449A1 true CA2095449A1 (en) | 1994-03-01 |
CA2095449C CA2095449C (en) | 1997-09-16 |
Family
ID=25474795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002095449A Expired - Fee Related CA2095449C (en) | 1992-08-31 | 1993-05-04 | Supersaturated rare earth doped semiconductor layers by chemical vapor deposition |
Country Status (11)
Country | Link |
---|---|
US (3) | US5322813A (en) |
EP (1) | EP0586321B1 (en) |
JP (1) | JPH0785467B2 (en) |
KR (1) | KR970008339B1 (en) |
CN (3) | CN1054234C (en) |
AT (1) | ATE166491T1 (en) |
CA (1) | CA2095449C (en) |
DE (1) | DE69318653T2 (en) |
ES (1) | ES2116426T3 (en) |
MX (1) | MX9305267A (en) |
TW (1) | TW229325B (en) |
Families Citing this family (35)
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US4873549A (en) * | 1987-03-03 | 1989-10-10 | Mita Industrial Co., Ltd. | Device for detecting the life of an image forming process unit, opening of a seal of the unit and attachment of the unit to an image forming apparatus |
EP0650200B1 (en) * | 1993-10-20 | 1999-03-10 | Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno | Solid state electro-luminescent device and process for fabrication thereof |
US6093246A (en) * | 1995-09-08 | 2000-07-25 | Sandia Corporation | Photonic crystal devices formed by a charged-particle beam |
US5976941A (en) * | 1997-06-06 | 1999-11-02 | The Whitaker Corporation | Ultrahigh vacuum deposition of silicon (Si-Ge) on HMIC substrates |
US6040225A (en) * | 1997-08-29 | 2000-03-21 | The Whitaker Corporation | Method of fabricating polysilicon based resistors in Si-Ge heterojunction devices |
US6130471A (en) * | 1997-08-29 | 2000-10-10 | The Whitaker Corporation | Ballasting of high power silicon-germanium heterojunction biploar transistors |
KR100377716B1 (en) * | 1998-02-25 | 2003-03-26 | 인터내셔널 비지네스 머신즈 코포레이션 | Electric pumping of rare-earth-doped silicon for optical emission |
US6307625B1 (en) | 1998-06-29 | 2001-10-23 | San Diego State University | Method and apparatus for determination of carbon-halogen compounds and applications thereof |
US6140669A (en) * | 1999-02-20 | 2000-10-31 | Ohio University | Gallium nitride doped with rare earth ions and method and structure for achieving visible light emission |
US6143072A (en) * | 1999-04-06 | 2000-11-07 | Ut-Battelle, Llc | Generic process for preparing a crystalline oxide upon a group IV semiconductor substrate |
US6255669B1 (en) * | 1999-04-23 | 2001-07-03 | The University Of Cincinnati | Visible light emitting device formed from wide band gap semiconductor doped with a rare earth element |
KR100510996B1 (en) * | 1999-12-30 | 2005-08-31 | 주식회사 하이닉스반도체 | Method for optimizing processes of selective epitaxial growth |
US6519543B1 (en) * | 2000-05-09 | 2003-02-11 | Agere Systems Inc. | Calibration method for quantitative elemental analysis |
US6734453B2 (en) | 2000-08-08 | 2004-05-11 | Translucent Photonics, Inc. | Devices with optical gain in silicon |
KR100384892B1 (en) * | 2000-12-01 | 2003-05-22 | 한국전자통신연구원 | Fabrication method of erbium-doped silicon nano-dots |
US6853447B2 (en) * | 2001-02-12 | 2005-02-08 | Analytical Spectral Devices, Inc. | System and method for the collection of spectral image data |
US6894772B2 (en) * | 2001-02-12 | 2005-05-17 | Analytical Spectral Devices | System and method for grouping reflectance data |
JP2002334868A (en) * | 2001-05-10 | 2002-11-22 | Hitachi Kokusai Electric Inc | Substrate treatment equipment and method for manufacturing semiconductor device |
US20030111013A1 (en) * | 2001-12-19 | 2003-06-19 | Oosterlaken Theodorus Gerardus Maria | Method for the deposition of silicon germanium layers |
US6771369B2 (en) * | 2002-03-12 | 2004-08-03 | Analytical Spectral Devices, Inc. | System and method for pharmacy validation and inspection |
US20040214362A1 (en) * | 2003-01-22 | 2004-10-28 | Hill Steven E. | Doped semiconductor nanocrystal layers and preparation thereof |
US7440180B2 (en) * | 2004-02-13 | 2008-10-21 | Tang Yin S | Integration of rare-earth doped amplifiers into semiconductor structures and uses of same |
US7163878B2 (en) * | 2004-11-12 | 2007-01-16 | Texas Instruments Incorporated | Ultra-shallow arsenic junction formation in silicon germanium |
CN100385693C (en) * | 2005-08-18 | 2008-04-30 | 中国科学院半导体研究所 | Method for raising radiation of silicone based crystal thin film by use of process of plasma |
DE102006031300A1 (en) * | 2006-06-29 | 2008-01-03 | Schmid Technology Systems Gmbh | Method for doping silicon material for solar cells, correspondingly doped silicon material and solar cell |
US20080138955A1 (en) * | 2006-12-12 | 2008-06-12 | Zhiyuan Ye | Formation of epitaxial layer containing silicon |
US8283201B2 (en) * | 2008-06-05 | 2012-10-09 | American Air Liquide, Inc. | Preparation of lanthanide-containing precursors and deposition of lanthanide-containing films |
US8269253B2 (en) * | 2009-06-08 | 2012-09-18 | International Rectifier Corporation | Rare earth enhanced high electron mobility transistor and method for fabricating same |
CN102828242B (en) * | 2012-09-06 | 2015-05-27 | 西安隆基硅材料股份有限公司 | Crystalline silicon with lower converting lighting quantum dots and preparation method thereof |
US9481917B2 (en) * | 2012-12-20 | 2016-11-01 | United Technologies Corporation | Gaseous based desulfurization of alloys |
EP3027989B1 (en) * | 2013-07-30 | 2018-02-28 | Board of Regents, The University of Texas System | Sample transfer to high vacuum transition flow |
US9850573B1 (en) | 2016-06-23 | 2017-12-26 | Applied Materials, Inc. | Non-line of sight deposition of erbium based plasma resistant ceramic coating |
US10364259B2 (en) * | 2016-12-30 | 2019-07-30 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Zirconium, hafnium, titanium precursors and deposition of group 4 containing films using the same |
US10975469B2 (en) | 2017-03-17 | 2021-04-13 | Applied Materials, Inc. | Plasma resistant coating of porous body by atomic layer deposition |
GB201812765D0 (en) * | 2018-08-06 | 2018-09-19 | Univ London Queen Mary | Substrate layer |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1900116C3 (en) * | 1969-01-02 | 1978-10-19 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Process for the production of high-purity monocrystalline layers consisting of silicon |
US4385946A (en) * | 1981-06-19 | 1983-05-31 | Bell Telephone Laboratories, Incorporated | Rapid alteration of ion implant dopant species to create regions of opposite conductivity |
DE3319134A1 (en) * | 1983-05-26 | 1985-05-02 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München | Optoelectronic component, in particular a laser diode or a light-emitting diode |
US4618381A (en) * | 1983-05-26 | 1986-10-21 | Fuji Electric Corporate Research And Development Ltd. | Method for adding impurities to semiconductor base material |
US4800173A (en) * | 1986-02-20 | 1989-01-24 | Canon Kabushiki Kaisha | Process for preparing Si or Ge epitaxial film using fluorine oxidant |
US4826288A (en) * | 1987-04-09 | 1989-05-02 | Polaroid Corporation, Patent Department | Method for fabricating optical fibers having cores with high rare earth content |
US5248890A (en) * | 1989-05-13 | 1993-09-28 | Forschungszentrum Julich Gmbh | Valance specific lanthanide doped optoelectronic metal fluoride semiconductor device |
US5296048A (en) * | 1989-05-31 | 1994-03-22 | International Business Machines Corporation | Class of magnetic materials for solid state devices |
FR2650704B1 (en) * | 1989-08-01 | 1994-05-06 | Thomson Csf | PROCESS FOR THE MANUFACTURE BY EPITAXY OF MONOCRYSTALLINE LAYERS OF MATERIALS WITH DIFFERENT MESH PARAMETERS |
JPH042699A (en) * | 1990-04-18 | 1992-01-07 | Mitsubishi Electric Corp | Growing of crystal |
US5119460A (en) * | 1991-04-25 | 1992-06-02 | At&T Bell Laboratories | Erbium-doped planar optical device |
US5107538A (en) * | 1991-06-06 | 1992-04-21 | At&T Bell Laboratories | Optical waveguide system comprising a rare-earth Si-based optical device |
US5511946A (en) * | 1994-12-08 | 1996-04-30 | General Electric Company | Cooled airfoil tip corner |
-
1992
- 1992-08-31 US US07/940,416 patent/US5322813A/en not_active Expired - Lifetime
-
1993
- 1993-05-04 CA CA002095449A patent/CA2095449C/en not_active Expired - Fee Related
- 1993-07-28 JP JP5185980A patent/JPH0785467B2/en not_active Expired - Fee Related
- 1993-07-30 EP EP93480110A patent/EP0586321B1/en not_active Expired - Lifetime
- 1993-07-30 AT AT93480110T patent/ATE166491T1/en active
- 1993-07-30 ES ES93480110T patent/ES2116426T3/en not_active Expired - Lifetime
- 1993-07-30 DE DE69318653T patent/DE69318653T2/en not_active Expired - Lifetime
- 1993-08-19 TW TW082106685A patent/TW229325B/zh not_active IP Right Cessation
- 1993-08-30 MX MX9305267A patent/MX9305267A/en not_active IP Right Cessation
- 1993-08-30 KR KR1019930017032A patent/KR970008339B1/en not_active IP Right Cessation
- 1993-08-30 CN CN93117079A patent/CN1054234C/en not_active Expired - Fee Related
-
1994
- 1994-03-09 US US08/207,942 patent/US5534079A/en not_active Expired - Lifetime
-
1995
- 1995-06-06 US US08/468,367 patent/US5646425A/en not_active Expired - Fee Related
-
1999
- 1999-11-09 CN CN99123482A patent/CN1114225C/en not_active Expired - Fee Related
- 1999-11-09 CN CN99123481A patent/CN1117389C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN1054234C (en) | 2000-07-05 |
JPH0785467B2 (en) | 1995-09-13 |
CN1114225C (en) | 2003-07-09 |
CN1255735A (en) | 2000-06-07 |
JPH06177062A (en) | 1994-06-24 |
EP0586321B1 (en) | 1998-05-20 |
DE69318653D1 (en) | 1998-06-25 |
KR940004714A (en) | 1994-03-15 |
EP0586321A3 (en) | 1996-03-27 |
DE69318653T2 (en) | 1999-02-04 |
CN1255736A (en) | 2000-06-07 |
US5534079A (en) | 1996-07-09 |
EP0586321A2 (en) | 1994-03-09 |
MX9305267A (en) | 1994-02-28 |
TW229325B (en) | 1994-09-01 |
CN1117389C (en) | 2003-08-06 |
ATE166491T1 (en) | 1998-06-15 |
CA2095449C (en) | 1997-09-16 |
KR970008339B1 (en) | 1997-05-23 |
US5646425A (en) | 1997-07-08 |
US5322813A (en) | 1994-06-21 |
ES2116426T3 (en) | 1998-07-16 |
CN1085353A (en) | 1994-04-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |