US4420684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large-surface fast photodetector sensitive in the 0.8-1.1 μm range
Assignee: Societe Anonyme de Telecommunications SAT
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Filing: 1981-06-09
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Granted: 1983-12-13
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Expires: 2001-06-09
Abstract
Abstract The photodetector comprises a silicon substrate with high sensitivity, a diffusion layer defining a PN junction, and a CdTe layer, as filter, placed on the face close to the PN junction, for stopping radiations of wave lengths shorter than 0.8 mu m. The photodetector is suitable for detecting radiations of AsGa diodes used in optical telecommunication systems.
Inventors
- 👤 Andre Gauthier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:30
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/30; H10F77/306; H10F77/331; H10F30/00; H10F30/20; H10F30/21; H10F30/22; H10F30/221
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
In a large-surface photovoltaic photodetector, sensitive in the 0.8-1.1 μm range, comprising a substrate made of silicon with resistivity higher than 10 3 Ω.cm, a diffusion layer having a thickness smaller than 1 μm defining a PN junction, a filter placed on the face exposed to the radiations in order to stop the radiations having a wave-length shorter than a predetermined length, and contacts for application of a bias potential, characterized in that the filter is a layer of CdTe integrated in the detector and stopping the radiations having a wave-length shorter than 0.8 μm.
Claim 2
Dependent Claim
95 words
In a large-surface photovoltaic photodetector, sensitive in the 0.8-1.1 μm range, comprising a substrate made of silicon with resistivity higher than 10 3 Ω.cm, a diffusion layer having a thickness smaller than 1 μm defining a PN junction, a filter placed on the face exposed to the radiations in order to stop the radiations having a wave-length shorter than a predetermined length, and contacts for application of a bias potential, characterized in that the filter is a layer of CdTe integrated in the detector and stopping the radiations having a wave-length shorter than 0.8 μm.
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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |