US5629531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of obtaining high quality silicon dioxide passivation on silicon carbide and resulting passivated structures
Assignee: Wolfspeed Inc
•
Filing: 1994-12-09
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Granted: 1997-05-13
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Expires: 2014-12-09
Abstract
Abstract A method of obtaining high quality passivation layers on silicon carbide surfaces by oxidizing a sacrificial layer of a silicon-containing material on a silicon carbide portion of a device structure to substantially consume the sacrificial layer to produce an oxide passivation layer on the silicon carbide portion that is substantially free of dopants that would otherwise degrade the electrical integrity of the oxide layer.
Inventors
- 👤 John W. Palmour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:34
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/80; H10D62/83; H10D62/832; H10D62/8325; H10D12/00; H10D12/01; H10D12/031; H10D64/00; H10D64/01; H10D64/013; H10D64/01366; H10D64/60; H10D64/66; H10D64/68; H10D8/00; H10D8/01; H10D8/051; H10W; H10W74/00; H10W74/10; H10W74/131; H10W74/137; H10D30/00; H10D30/60; Y; Y10; Y10S; Y10S148/00; Y10S148/148; Y10S438/00; Y10S438/931
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
58 words
A silicon carbide-based device structure having passivation areas that have substantially fewer impurities than the amounts normally associated with oxides grown on doped silicon carbide, said structure comprising: a silicon carbide portion; and a thermally-grown oxidation layer upon said silicon carbide portion, said oxidation layer having an aluminum dopant concentration of 3E17 (3×10.sup.∫ cm -3 ) or less.
Claim 2
Dependent Claim
58 words
A silicon carbide-based device structure having passivation areas that have substantially fewer impurities than the amounts normally associated with oxides grown on doped silicon carbide, said structure comprising: a silicon carbide portion; and a thermally-grown oxidation layer upon said silicon carbide portion, said oxidation layer having an aluminum dopant concentration of 3E17 (3×10.sup.∫ cm -3 ) or less.
Claim 3
Dependent Claim
33 words
A device structure according to claim 1 wherein said silicon carbide portion is selected from the group consisting of: a substrate, epitaxial layers, mesa sidewalls, implanted wells, diffused wells, and any combinations thereof.
Claim 4
Dependent Claim
25 words
A device structure according to claim 1 wherein said oxidation layer is substantially free of carbon-oxygen by-products typically associated with thermal oxidation of silicon carbide.
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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) | 2000-05-12 | 2000-11-11 | 2001-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-12 | 2004-11-11 | 2005-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-12 | 2008-11-11 | 2009-05-13 | $7700.00 | Window Closed / Lapsed |