US3796882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon-cadmium selenide heterojunctions
Assignee: International Business Machines Corp
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Filing: 1972-05-08
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Granted: 1974-03-12
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Expires: 1992-05-08
Abstract
Abstract It is desirable to provide photodiodes that can be manufactured at low temperatures ( < OR = 250*C), have large light-sensitive areas ( > OR = 1cm2), produce a photocurrent that is linearly responsive to photon flux, have low dark sensitivity and high light sensitivity, a low optimum operating voltage of * 1.5 volts and relatively fast rise and decay times of the order of 3 microseconds. A silicon-cadmium selenide p-n heterojunction has been found to have the above noted desirable characteristics.
Inventors
- 👤 J Cahill
- 👤 B Sharma
- 👤 Der Meulen Y Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:19
CPC Classifications
H; H10; H10F; H10F30/00; H10F30/20; H10F30/21; H10F30/22; H10F30/222; H10P; H10P95/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
28 words
The composite unit of claim 1 including contacts on said silicon substrate and said cadmium selenide film, respectively, wherein the contact on said cadmium selenide film is transparent.
Claim 2
Dependent Claim
66 words
A composite unit for use as a heterojunction photodiode comprising a p-type silicon substrate, an n-type cadmium selenide film of the order of 3,000-6,000A thick on said substrate having a resistivity of the order of 107 Omega -cm, an ohmic contact on said silicon substrate, a transparent contact on said cadmium selenide film, and a source of electrical potential connected across said unit to said contacts.
Claim 3
Dependent Claim
32 words
The composite unit of claim 3 including an ammeter in series with said source of potential to record changes in current flow through said unit when light impinges on said cadmium selenide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |