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US5296403A
Expired / Lapsed
US
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Method of manufacturing a static induction field-effect transistor
Assignee: Tohoku University
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Filing: 1992-10-23
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Granted: 1994-03-22
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Expires: 2012-10-23
Abstract
Abstract A semiconductor device comprises a vertical MIS-SIT which has a smaller source-to-drain distance for operation at ultra-high speed. The semiconductor device has a substrate crystal for epitaxial growth thereon, least two semiconductor regions of different conductivity types deposited by way of epitaxial growth on the substrate crystal according to either metal organic chemical vapor deposition (MO-CVD) or molecular layer epitaxy (MLE), thereby providing a source-drain structure, a gate side formed by etching the semiconductor regions of the source-drain structure, the gate side comprising either a (111)A face or a (111)B face, and a semiconductor region deposited as a gate by way of epitaxial growth on the gate side according to either MO-CVD or MLE.
Inventors
- 👤 Jun-ichi Nishizawa
- 👤 Toru Kurabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:04
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/40; H10D62/405; H10D30/00; H10D30/01; H10D30/012; H10D30/202; H10D30/80; H10D30/801; H10D64/00; H10D64/01; H10D64/012; H10D64/0124; H10D64/0125; H10D62/80; H10D62/85
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
A method of manufacturing a semiconductor device, comprising the steps of: depositing at least two semiconductor regions of different conductivity types by way of epitaxial growth on a substrate crystal according to either metal organic chemical vapor deposition or molecular layer epitaxy, thereby providing a source-drain structure; etching said semiconductor regions to form a gate side which comprises either a (111)A face or a (111)B face; and depositing a semiconductor region as a gate by way of epitaxial growth on said gate side according to either metal organic chemical vapor deposition or molecular layer epitaxy.
Claim 2
Independent Claim
95 words
A method of manufacturing a semiconductor device, comprising the steps of: depositing at least two semiconductor regions of different conductivity types by way of epitaxial growth on a substrate crystal according to either metal organic chemical vapor deposition or molecular layer epitaxy, thereby providing a source-drain structure; etching said semiconductor regions to form a gate side which comprises either a (111)A face or a (111)B face; and depositing a semiconductor region as a gate by way of epitaxial growth on said gate side according to either metal organic chemical vapor deposition or molecular layer epitaxy.
Claim 3
Dependent Claim
66 words
A method according to claim 1, wherein said substrate crystal is highly doped with impurities and used as either a source or a drain of the source-drain structure, further including the step of: depositing an insulating layer by way of epitaxial growth between an electrode which serves as said gate and said source region according to either metal organic chemical vapor deposition or molecular layer epitaxy.
Claim 4
Dependent Claim
40 words
A method according to claim 1, wherein said substrate crystal comprises a semi-insulating substrate crystal, further including the step of: exposing a semiconductor layer which is highly doped with impurities for use as a source region of the source-drain structure.
Claim 5
Independent Claim
29 words
A method according to any one of claims 1 through 3, wherein said substrate crystal comprises either one of a (111)A face, a (111)B face, and a (110) face.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-21 | 1997-09-20 | 1998-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-21 | 2001-09-20 | 2002-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-21 | 2005-09-20 | 2006-03-22 | $7700.00 | Window Closed / Lapsed |