US3850688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ohmic contact for p-type group iii-v semiconductors
Assignee: General Electric Co
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Filing: 1972-12-18
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Granted: 1974-11-26
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Expires: 1992-12-18
Abstract
Abstract Layers of gold, gold-zinc, and gold are successively evaporated onto p-type semiconductor material of Group III-V such as gallium phosphide, and sintered. Other metallic Group II elements can be substituted for the zinc. An initial layer of gold may first be evaporated and alloyed into the p-type material.
Inventors
- 👤 I Halt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:06
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/10; H10W76/12; H10W76/13; H10W76/132; H10W72/00; H10W72/50; H10W72/531; H10W72/536; H10W72/5363; Y; Y10; Y10S; Y10S148/00; Y10S148/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A METHOD OF MAKING AN OHMIC CONTACT TO A P-TYPE GROUP III-V MATERIAL, COMPRISING THE STEPS OF DEPOSITING A LAYER OF GOLD ONTO A SURFACE OF SAID MATERIAL, DE PRIZING ZINC OVER THE GOLD LAYER, DEPOSITING A LAYER OF GOLD OVER SAID LAST NAMED LAYER, AND HEATING TO SINTER THE DEPOSITED LAYERS AT LEAST PARTIALLY INTO SAID SURFACE OF THE MATERIAL.
Claim 2
Independent Claim
61 words
A METHOD OF MAKING AN OHMIC CONTACT TO A P-TYPE GROUP III-V MATERIAL, COMPRISING THE STEPS OF DEPOSITING A LAYER OF GOLD ONTO A SURFACE OF SAID MATERIAL, DE PRIZING ZINC OVER THE GOLD LAYER, DEPOSITING A LAYER OF GOLD OVER SAID LAST NAMED LAYER, AND HEATING TO SINTER THE DEPOSITED LAYERS AT LEAST PARTIALLY INTO SAID SURFACE OF THE MATERIAL.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1, in which said layer comprising zinc includes gold in combination with the zinc.
Claim 4
Dependent Claim
84 words
A method as claimed in claim 2, in which the first-named gold layer prior to sintering has a thickness of from about 500 to 5, 000 A, in which said layer comprising zinc and gold prior to sintering has a thickness of from about 1,000 to 10,000 A with the quantity of zinc ranging from about 1 to 15 percent by weight of the accompanying gold, and the last-named gold layer prior to sintering has a thickness of from about 500 to 5,000 A.
Claim 5
Dependent Claim
22 words
A method as claimed in claim 2, in which said Group III-V material is gallium arsenide, gallium phosphide, or gallium arsenide phosphide.
Claim 6
Dependent Claim
42 words
A method as claimed in claim 1, including the additional initial steps of depositing a preliminary layer of gold onto said surface of the material, and heating to form at said surface an alloy of gold and the p-type Group III-V material.
Claim 7
Dependent Claim
32 words
A method as claimed in claim 5, in which said preliminary layer of gold has a thickness of from about 500 to 5,000 A prior to being heated to form said alloy.
References Cited (Backward Citations)
US3349476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |