Patent US4107731A successfully refreshed from Google Patents.
US4107731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon doped with cadmium to reduce lifetime
Assignee: Hitachi Ltd
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Filing: 1976-03-19
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Granted: 1978-08-15
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Expires: 1996-03-19
Abstract
Abstract A semiconductor device is doped with a multiple acceptor impurity having a monovalent energy level for forming a recombination center of carriers within the semiconductor body, and at least one multivalent energy level for capturing carriers within a depletion layer of a PN junction of the semiconductor body.
Inventors
- 👤 Masayoshi Naito
- 👤 Tatsuya Kamei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:52
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/80; H10D62/83; H10D62/834; Y; Y10; Y10S; Y10S438/00; Y10S438/904; Y10S438/914; Y10S438/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A semiconductor device comprising a silicon semiconductor body having a first layer of N type conductivity and a second layer of P type conductivity adjacent to said first layer so as to form a PN junction between said first and second layers, said second layer having a higher resistivity than that of the first layer, and said second layer being doped with cadmium for imparting a short reverse recovery time of the PN junction to the device.
Claim 2
Dependent Claim
77 words
A semiconductor device comprising a silicon semiconductor body having a first layer of N type conductivity and a second layer of P type conductivity adjacent to said first layer so as to form a PN junction between said first and second layers, said second layer having a higher resistivity than that of the first layer, and said second layer being doped with cadmium for imparting a short reverse recovery time of the PN junction to the device.
References Cited (Backward Citations)
US3514675A
Cited
US3821784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-14 | 1982-02-13 | 1982-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-14 | 1986-02-13 | 1986-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-14 | 1990-02-13 | 1990-08-15 | $7700.00 | Window Closed / Lapsed |