US3779801A
Expired / Lapsed
US
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High mobility epitaxial layers of pbte and pb{11 {118 {11 {11 sn{11 {11 te prepared by post- growth annealing
Assignee: Ford Motor Co
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Filing: 1971-03-26
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Granted: 1973-12-18
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Expires: 1991-03-26
Abstract
Abstract This invention teaches the preparation of lead tin telluride films when such films are deposited upon a cleaved base of barium fluoride. Barium fluoride supported epitaxial films of lead tin telluride are especially useful as a detector of radiation in the infra red region centered upon the 10 micron (100,000 Angstrom) wave length. Post-growth annealing has been found to give n-type layers of PbTe and Pb1 x Snx Te (with x about 0.2) with much larger low-temperature Hall mobilities than as-grown layers.
Inventors
- 👤 H Halloway
- 👤 Logothetis E Miltiadis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:22
CPC Classifications
H; H10; H10P; H10P95/00; C; C30; C30B; C30B29/00; C30B29/10; C30B29/46; C30B33/00; Y; Y10; Y10S; Y10S148/00; Y10S148/003; Y10S148/063; Y10S148/15
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
The process recited in claim 1 in which the annealing temperature is 300* to 350*C.
Claim 2
Dependent Claim
22 words
The process recited in claim 1 in which the annealing is carried on for a time period of 20 to 100 hours.
Claim 3
Dependent Claim
22 words
The process recited in claim 2 in which the annealing is carried on for a time period of 20 to 100 hours.
Claim 4
Dependent Claim
47 words
The process of preparing an epitaxial lead tin telluride comprising evaporating in a vacuum a film of lead tin telluride upon a surface of barium fluoride and then annealing the element so produced by annealing it in a closed container from which all air has been removed.
Claim 5
Dependent Claim
15 words
The process recited in claim 5 in which the annealing temperature is 300* to 350*C.
Claim 6
Dependent Claim
22 words
The process recited in claim 5 in which the annealing is carried on for a time period of 20 to 100 hours.
Claim 7
Dependent Claim
22 words
The process recited in claim 6 in which the annealing is carried on for a time period of 20 to 100 hours.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |