US3699408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gallium-arsenide schottky barrier type semiconductor device
Assignee: NEC Corp
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Filing: 1971-01-20
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Granted: 1972-10-17
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Expires: 1991-01-20
Abstract
Abstract A Shottky barrier diode includes a GaAs epitaxial wafer. A Pt-Ni alloy is used as the contact metal to form the Schottky barrier, and an additional alloy layer is formed in the boundary between the Pt-Nl alloy and the GaAs wafer to increase the bonding strength between the wafer and the alloy.
Inventors
- 👤 Daizaburo Shinoda
- 👤 Masaoki Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:00
CPC Classifications
H; H10; H10D; H10D8/00; H10D8/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
The gallium-arsenide Schottky barrier type semiconductor device as defined in claim 1, wherein said gallium-arsenide wafer is of n-conductivity type and wherein said platinum-nickel alloy contains 10 to 50 percent by weight of nickel.
Claim 2
Dependent Claim
81 words
A gallium-arsenide Schottky barrier field effect transistor comprising an n-conductivity type gallium-arsenide wafer, source and drain electrodes ohmically attached to one surface of said wafer and separated from each other, and a gate electrode attached to an area of the surface of said wafer between said source and drain electrodes, said gate electrode consisting of a layer of platinum-nickel alloy containing 10 to 50 percent by weight of nickel and a reaction layer between said wafer and said platinum-nickel alloy layer.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |