US3755002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making photoconductive film
Assignee: Hitachi Ltd
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Filing: 1972-04-11
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Granted: 1973-08-28
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Expires: 1992-04-11
Abstract
Abstract An n-type film consisting of a group II - VI compound is evaporated on a transparent electrode, and heat-treated in an atmosphere containing group VI element or an inert gas. On this n-type film, a p-type film consisting of a vitreous material such as Se, Te and As is deposited to form a hetero junction, photoconductive film. The above procedure enables the enhancement of the photosensitivity of a film more than three times as large as that of the conventional one.
Inventors
- 👤 T Hirai
- 👤 E Maruyama
- 👤 K Inao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:05
CPC Classifications
H; H10; H10F; H10F30/00; H10F30/20; H10F30/21; H10F30/22; H10F30/222; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/451; H01J29/456; H10P; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/049; Y10S148/064; Y10S148/072; Y10S148/12; Y10S148/169
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
14 words
A method according to claim 1, in which said group VI element is oxygen.
Claim 2
Dependent Claim
14 words
A method according to claim 1, in which said group VI element is sulphur.
Claim 3
Dependent Claim
14 words
A method according to claim 1, in which said group VI element is selenium.
Claim 4
Dependent Claim
13 words
A method according to claim 1, in which said hydride is water vapor.
Claim 5
Dependent Claim
13 words
A method according to claim 1, in which said hydride is hydrogen sulphide.
Claim 6
Dependent Claim
13 words
A method according to claim 1, in which said hydride is hydrogen selenide.
Claim 7
Dependent Claim
20 words
A method according to claim 1, in which said heat treatment is done at a temperature of 400* to 800*C.
Claim 8
Dependent Claim
19 words
A method according to claim 1, in which said heat treatment is done for 30 minutes to 2 hours.
Claim 9
Dependent Claim
34 words
A method according to claim 1, in which said group II - VI compound is formed of at least one selected from the group consisting of sulphides, selenides, and tellurides of cadmium and zinc.
Claim 10
Dependent Claim
35 words
A method according to claim 1, in which said p type film is mainly composed of selenium and further includes at least one selected from the group consisting of sulphur, tellurium, antimony, bismuth and arsenic.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |