US4249957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper doped polycrystalline silicon solar cell
Assignee: Individual
•
Filing: 1979-05-30
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Granted: 1981-02-10
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Expires: 1999-05-30
Abstract
Abstract Photovoltaic cells having improved performance are fabricated from polycrystalline silicon containing copper segregated at the grain boundaries.
Inventors
- 👤 with respect to an invention of Lovelace Alan M. Administrator of the National Aeronautics and Space Administration
- 👤 Krishna M. Koliwad
- 👤 Taher Daud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:53
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/10; H10F77/16; H10F77/162; H10F77/164; H10F77/1642; H10F10/00; H10F10/10; H10F10/14; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y02E10/546; Y02E10/547; Y10; Y10S; Y10S148/00; Y10S148/04; Y10S148/041; Y10S148/12; Y10S148/153
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A photovoltaic solar cell comprising: a polycrystalline silicon body having a grain size from 100 A to 0.05 mm doped with an element providing a first conductivity type and also containing 10 14 to 10 15 atoms per cc of copper segregated at the grain boundaries and further comprising a surface layer of opposite conductivity type and electrode means directly connected to each of said conductivity portions of the body.
Claim 2
Dependent Claim
70 words
A photovoltaic solar cell comprising: a polycrystalline silicon body having a grain size from 100 A to 0.05 mm doped with an element providing a first conductivity type and also containing 10 14 to 10 15 atoms per cc of copper segregated at the grain boundaries and further comprising a surface layer of opposite conductivity type and electrode means directly connected to each of said conductivity portions of the body.
Claim 3
Dependent Claim
26 words
A cell according to claim 1 in which the element providing said first conductivity type is boron and the opposite conductivity type surface layer includes phosphorus.
Claim 4
Dependent Claim
17 words
A cell according to claim 1 in which the grain size is from 0.05 to 0.5 mm.
Claim 5
Dependent Claim
27 words
A cell according to claim 3 in which the element providing said first conductivity type is boron and the element providing said second conductivity type is phosphorus.
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |