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US3622844A
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Avalanche photodiode utilizing schottky-barrier configurations
Assignee: Texas Instruments Inc
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Filing: 1969-08-18
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Granted: 1971-11-23
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Expires: 1989-08-18
Abstract
Abstract An avalanche Schottky-barrier photodiode includes a symmetrical metallic grid network deposited over a semiconductor substrate and surrounded by one or more metallic guard rings. When a sufficiently high voltage bias is supplied to the metallic grid network, carriers generated by light impinging upon the semiconductor substrate through the grid network are multiplied by the avalanche gain operation of the photodiode.
Inventors
- 👤 Anthony E Barelli
- 👤 Wallace N Shaunfield Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:21
CPC Classifications
H; H10; H10F; H10F30/00; H10F30/20; H10F30/21; H10F30/22; H10F30/225; H10F99/00; H10P; H10P95/00; H10W; H10W20/00; H10W20/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
The photodiode of claim 1 wherein the resistivity of said substrate is on the order of 100-300 ohm-cm.
Claim 2
Dependent Claim
24 words
The photodiode of claim 1 further comprising a continuous metallic conductor area circumscribing said contact means and forming a Schottky-barrier junction with said substrate.
Claim 3
Dependent Claim
24 words
The photodiode of claim 1 including a semiconductor guard area of opposite conductivity type diffused in said semiconductor substrate and surrounding said contact means.
Claim 4
Dependent Claim
28 words
The photodiode of claim 1 wherein said contact means is comprised of a plurality of discrete, interconnected selectivity spaced apart metallic areas symmetrically arranged on said substrate surface.
Claim 5
Dependent Claim
21 words
The photodiode of claim 5 wherein said metallic areas are a plurality of parallel strips inteRconnected by a circumscribing metallic area.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |