US3611071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inversion prevention system for semiconductor devices
Assignee: International Business Machines Corp
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Filing: 1969-04-10
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Granted: 1971-10-05
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Expires: 1989-04-10
Abstract
Abstract A passivated coated semiconductor device in which a phosphosilicate layer, included to retard inversion in P-type areas or enhancement in N-type areas of the device, is supplemented by a negatively charged electrode to prevent inherent but undesirable positive mobile charges accumulated during fabrication or originated by an overlying encapsulating layer from passing through the phosphosilicate layer and reaching the P-type areas, where they could cause inversion.
Inventors
- 👤 Benjamin Agusta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:50
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/40; H10W74/43; H10D; H10D99/00; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A device according to claim 1 wherein said thermal oxide material includes a phosphosilicate and wherein said semiconductor material comprises silicon.
Claim 2
Dependent Claim
58 words
A device according to claim 1 further comprising: removable means for applying heat of a magnitude sufficient to heat said device to a temperature between 100* C. and 300* C., simultaneously with the application of a potential to said conductive electrode for a period of time sufficient to remove ionic contaminants from the surface of said semiconductor material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |