GB2104723B - Semiconductor substrate and method of manufacturing the same - Google Patents
Semiconductor substrate and method of manufacturing the sameInfo
- Publication number
- GB2104723B GB2104723B GB08218306A GB8218306A GB2104723B GB 2104723 B GB2104723 B GB 2104723B GB 08218306 A GB08218306 A GB 08218306A GB 8218306 A GB8218306 A GB 8218306A GB 2104723 B GB2104723 B GB 2104723B
- Authority
- GB
- United Kingdom
- Prior art keywords
- manufacturing
- same
- semiconductor substrate
- semiconductor
- substrate
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/32—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by intermediate layers between substrates and deposited layers
- H10P14/3242—Structure
- H10P14/3244—Layer structure
- H10P14/3248—Layer structure consisting of two layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/29—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by the substrates
- H10P14/2901—Materials
- H10P14/2902—Materials being Group IVA materials
- H10P14/2905—Silicon, silicon germanium or germanium
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/29—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by the substrates
- H10P14/2901—Materials
- H10P14/2921—Materials being crystalline insulating materials
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/29—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by the substrates
- H10P14/2901—Materials
- H10P14/2922—Materials being non-crystalline insulating materials, e.g. glass or polymers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/29—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by the substrates
- H10P14/2924—Structures
- H10P14/2925—Surface structures
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/32—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by intermediate layers between substrates and deposited layers
- H10P14/3202—Materials thereof
- H10P14/3204—Materials thereof being Group IVA semiconducting materials
- H10P14/3211—Silicon, silicon germanium or germanium
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/32—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by intermediate layers between substrates and deposited layers
- H10P14/3202—Materials thereof
- H10P14/3238—Materials thereof being insulating materials
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/32—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by intermediate layers between substrates and deposited layers
- H10P14/3242—Structure
- H10P14/3244—Layer structure
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/32—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by intermediate layers between substrates and deposited layers
- H10P14/3242—Structure
- H10P14/3256—Microstructure
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/34—Deposited materials, e.g. layers
- H10P14/3402—Deposited materials, e.g. layers characterised by the chemical composition
- H10P14/3404—Deposited materials, e.g. layers characterised by the chemical composition being Group IVA materials
- H10P14/3411—Silicon, silicon germanium or germanium
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/34—Deposited materials, e.g. layers
- H10P14/3451—Structure
- H10P14/3452—Microstructure
- H10P14/3458—Monocrystalline
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/38—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by treatments done after the formation of the materials
- H10P14/3802—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
- H10P14/3808—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth using laser beams
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P14/00—Formation of materials, e.g. in the shape of layers or pillars
- H10P14/20—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials
- H10P14/38—Formation of materials, e.g. in the shape of layers or pillars of semiconductor materials characterised by treatments done after the formation of the materials
- H10P14/3802—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth
- H10P14/3818—Crystallisation or recrystallisation of non-monocrystalline semiconductor materials, e.g. regrowth using particle beams
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P34/00—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices
- H10P34/40—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices with high-energy radiation
- H10P34/42—Irradiation with electromagnetic or particle radiation of wafers, substrates or parts of devices with high-energy radiation with electromagnetic radiation, e.g. laser annealing
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W10/00—Isolation regions in semiconductor bodies between components of integrated devices
- H10W10/01—Manufacture or treatment
- H10W10/011—Manufacture or treatment of isolation regions comprising dielectric materials
- H10W10/012—Manufacture or treatment of isolation regions comprising dielectric materials using local oxidation of silicon [LOCOS]
- H10W10/0121—Manufacture or treatment of isolation regions comprising dielectric materials using local oxidation of silicon [LOCOS] in regions recessed from the surface, e.g. in trenches or grooves
- H10W10/0123—Manufacture or treatment of isolation regions comprising dielectric materials using local oxidation of silicon [LOCOS] in regions recessed from the surface, e.g. in trenches or grooves using auxiliary pillars in the regions
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W10/00—Isolation regions in semiconductor bodies between components of integrated devices
- H10W10/10—Isolation regions comprising dielectric materials
- H10W10/13—Isolation regions comprising dielectric materials formed using local oxidation of silicon [LOCOS], e.g. sealed interface localised oxidation [SILO] or side-wall mask isolation [SWAMI]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12528—Semiconductor component
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24777—Edge feature
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56104298A JPS586121A (ja) | 1981-07-02 | 1981-07-02 | 半導体基板 |
| JP56116008A JPS5820794A (ja) | 1981-07-24 | 1981-07-24 | 半導体基板の製造方法 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2104723A GB2104723A (en) | 1983-03-09 |
| GB2104723B true GB2104723B (en) | 1985-10-16 |
Family
ID=26444803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08218306A Expired GB2104723B (en) | 1981-07-02 | 1982-06-24 | Semiconductor substrate and method of manufacturing the same |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US4576851A (enExample) |
| DE (1) | DE3224604A1 (enExample) |
| GB (1) | GB2104723B (enExample) |
| NL (1) | NL188550C (enExample) |
Families Citing this family (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58164219A (ja) * | 1982-03-25 | 1983-09-29 | Agency Of Ind Science & Technol | 積層型半導体装置の製造方法 |
| US4461670A (en) * | 1982-05-03 | 1984-07-24 | At&T Bell Laboratories | Process for producing silicon devices |
| JPH0671043B2 (ja) * | 1984-08-31 | 1994-09-07 | 株式会社東芝 | シリコン結晶体構造の製造方法 |
| US4719183A (en) * | 1984-10-03 | 1988-01-12 | Sharp Kabushiki Kaisha | Forming single crystal silicon on insulator by irradiating a laser beam having dual peak energy distribution onto polysilicon on a dielectric substrate having steps |
| US4656101A (en) * | 1984-11-07 | 1987-04-07 | Semiconductor Energy Laboratory Co., Ltd. | Electronic device with a protective film |
| US4654958A (en) * | 1985-02-11 | 1987-04-07 | Intel Corporation | Process for forming isolated silicon regions and field-effect devices on a silicon substrate |
| US5753542A (en) * | 1985-08-02 | 1998-05-19 | Semiconductor Energy Laboratory Co., Ltd. | Method for crystallizing semiconductor material without exposing it to air |
| JPS6476760A (en) * | 1987-09-18 | 1989-03-22 | Toshiba Corp | Manufacture of semiconductor device |
| DE68913254T2 (de) * | 1988-10-02 | 1994-07-07 | Canon Kk | Gegenstand aus Kristall und Verfahren zu seiner Herstellung. |
| JP2597703B2 (ja) * | 1989-02-27 | 1997-04-09 | 三菱電機株式会社 | 半導体装置の製造方法 |
| EP0391081A3 (en) * | 1989-04-06 | 1991-08-07 | International Business Machines Corporation | Fabrication and structure of semiconductor-on-insulator islands |
| US5368880A (en) * | 1989-12-06 | 1994-11-29 | Westinghouse Electric Corporation | Eutectic bond and method of gold/titanium eutectic bonding of cadmium telluride to sapphire |
| JPH05182923A (ja) * | 1991-05-28 | 1993-07-23 | Semiconductor Energy Lab Co Ltd | レーザーアニール方法 |
| US5578520A (en) | 1991-05-28 | 1996-11-26 | Semiconductor Energy Laboratory Co., Ltd. | Method for annealing a semiconductor |
| US5766344A (en) | 1991-09-21 | 1998-06-16 | Semiconductor Energy Laboratory Co., Ltd. | Method for forming a semiconductor |
| US5373803A (en) * | 1991-10-04 | 1994-12-20 | Sony Corporation | Method of epitaxial growth of semiconductor |
| JP2908150B2 (ja) * | 1992-11-27 | 1999-06-21 | 日本電気株式会社 | Soi基板構造及びその製造方法 |
| US7097712B1 (en) | 1992-12-04 | 2006-08-29 | Semiconductor Energy Laboratory Co., Ltd. | Apparatus for processing a semiconductor |
| JP3165304B2 (ja) * | 1992-12-04 | 2001-05-14 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法及び半導体処理装置 |
| CN1052566C (zh) | 1993-11-05 | 2000-05-17 | 株式会社半导体能源研究所 | 制造半导体器件的方法 |
| US6897100B2 (en) | 1993-11-05 | 2005-05-24 | Semiconductor Energy Laboratory Co., Ltd. | Method for processing semiconductor device apparatus for processing a semiconductor and apparatus for processing semiconductor device |
| KR100294196B1 (ko) * | 1994-06-02 | 2002-10-18 | 삼성에스디아이 주식회사 | 평활막을구비한액정표시소자및그형성방법 |
| JPH11204452A (ja) * | 1998-01-13 | 1999-07-30 | Mitsubishi Electric Corp | 半導体基板の処理方法および半導体基板 |
| JP5025057B2 (ja) * | 2001-05-10 | 2012-09-12 | 株式会社半導体エネルギー研究所 | 半導体装置の作製方法 |
| WO2012050964A1 (en) * | 2010-09-29 | 2012-04-19 | The Trustees Of Columbia University In The City Of New York | Systems and methods using a glassy carbon heater |
| US9466520B2 (en) * | 2014-04-13 | 2016-10-11 | Texas Instruments Incorporated | Localized region of isolated silicon over recessed dielectric layer |
| US9437811B2 (en) * | 2014-12-05 | 2016-09-06 | Shanghai Ciyu Information Technologies Co., Ltd. | Method for making a magnetic random access memory element with small dimension and high quality |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3336159A (en) * | 1963-10-07 | 1967-08-15 | Ncr Co | Method for growing single thin film crystals |
| US3375418A (en) * | 1964-09-15 | 1968-03-26 | Sprague Electric Co | S-m-s device with partial semiconducting layers |
| CH455055A (de) * | 1967-03-15 | 1968-04-30 | Ibm | Halbleiteranordnung, bestehend aus einem Substrat, einer Öffnungen enthaltenden Maske und einer durch die Öffnungen mit dem Substrat verbundenen einkristallinen Halbleiterschicht |
| US3649386A (en) * | 1968-04-23 | 1972-03-14 | Bell Telephone Labor Inc | Method of fabricating semiconductor devices |
| US3789276A (en) * | 1968-07-15 | 1974-01-29 | Texas Instruments Inc | Multilayer microelectronic circuitry techniques |
| US3743552A (en) * | 1970-01-30 | 1973-07-03 | North American Rockwell | Process for coplanar semiconductor structure |
| US3740280A (en) * | 1971-05-14 | 1973-06-19 | Rca Corp | Method of making semiconductor device |
| US3929529A (en) * | 1974-12-09 | 1975-12-30 | Ibm | Method for gettering contaminants in monocrystalline silicon |
| DE2848333C2 (de) * | 1978-11-08 | 1984-12-20 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Verfahren zum Herstellen eines Halbleiterbauelements |
| US4252581A (en) * | 1979-10-01 | 1981-02-24 | International Business Machines Corporation | Selective epitaxy method for making filamentary pedestal transistor |
| US4269631A (en) * | 1980-01-14 | 1981-05-26 | International Business Machines Corporation | Selective epitaxy method using laser annealing for making filamentary transistors |
| EP0191505A3 (en) * | 1980-04-10 | 1986-09-10 | Massachusetts Institute Of Technology | Method of producing sheets of crystalline material |
| US4378627A (en) * | 1980-07-08 | 1983-04-05 | International Business Machines Corporation | Self-aligned metal process for field effect transistor integrated circuits using polycrystalline silicon gate electrodes |
| US4487639A (en) * | 1980-09-26 | 1984-12-11 | Texas Instruments Incorporated | Localized epitaxy for VLSI devices |
| US4462847A (en) * | 1982-06-21 | 1984-07-31 | Texas Instruments Incorporated | Fabrication of dielectrically isolated microelectronic semiconductor circuits utilizing selective growth by low pressure vapor deposition |
-
1982
- 1982-06-22 NL NLAANVRAGE8202526,A patent/NL188550C/xx not_active IP Right Cessation
- 1982-06-24 GB GB08218306A patent/GB2104723B/en not_active Expired
- 1982-07-01 DE DE19823224604 patent/DE3224604A1/de active Granted
-
1985
- 1985-04-16 US US06/723,708 patent/US4576851A/en not_active Expired - Lifetime
-
1988
- 1988-03-17 US US07/171,370 patent/USRE33096E/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| NL8202526A (nl) | 1983-02-01 |
| DE3224604A1 (de) | 1983-01-20 |
| US4576851A (en) | 1986-03-18 |
| GB2104723A (en) | 1983-03-09 |
| NL188550B (nl) | 1992-02-17 |
| NL188550C (nl) | 1992-07-16 |
| USRE33096E (en) | 1989-10-17 |
| DE3224604C2 (enExample) | 1989-06-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20020623 |