Patent US4235644A successfully refreshed from Google Patents.
US4235644A
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Thick film silver metallizations for silicon solar cells
Assignee: EIDP Inc
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Filing: 1979-08-31
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Granted: 1980-11-25
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Expires: 1999-08-31
Abstract
Abstract Thick film conductor compositions containing silver powder and lead bismuthate glass frit powder and an organic vehicle/solvent system are presented for use as grid metallizations to the n-type layers of n- on p- silicon solar cells.
Inventors
- 👤 Christopher R. S. Needes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:46
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C14/00; C03C14/006; C03C3/074; C03C3/0745; C03C8/00; C03C8/02; C03C8/10; C03C8/12; C03C8/14; C03C8/18; H; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H10; H10F; H10F77/00; H10F77/20; H10F77/206; H10F77/211; H10W; H10W20/00; H10W20/40; C03C2214/00; C03C2214/08; C03C2214/16; H10W72/00; H10W72/071; H10W72/073; H10W72/07331; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352; Y; Y02; Y02E; Y02E10/00; Y02E10/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
A solar cell comprising a body of silicon semiconductor material and at least one contact adhered thereto for accepting and directing a flow of electricity away from said body, said contact comprising an n-type region of said semiconductor body on which there has been screen printed a paste composition consisting essentially of a mixture of silver powder and lead bismuthate glass frit powder in a vehicle and solvent mixture, said composition having been heated to drive off the vehicle and solvent and thereafter fired at 550° to 750° C.
Claim 2
Dependent Claim
89 words
A solar cell comprising a body of silicon semiconductor material and at least one contact adhered thereto for accepting and directing a flow of electricity away from said body, said contact comprising an n-type region of said semiconductor body on which there has been screen printed a paste composition consisting essentially of a mixture of silver powder and lead bismuthate glass frit powder in a vehicle and solvent mixture, said composition having been heated to drive off the vehicle and solvent and thereafter fired at 550° to 750° C.
Claim 3
Dependent Claim
40 words
A solar cell according to claim 1 wherein the composition contains 65 to 75 percent by weight silver powder and a lead bismuthate glass frit powder dispersed in 25 to 35 percent by weight of a vehicle and solvent mixture.
Claim 4
Independent Claim
67 words
A method of preparing a solar cell comprising screen printing on an n-type layer of a semiconductor wafer a paste composition consisting essentially of a mixture of silver powder and lead bismuthate glass frit powder in a vehicle and solvent mixture, heating to remove the vehicle and solvent and thereafter firing at a temperature between 550° to 750° C. for a time between one and ten minutes.
Claim 5
Independent Claim
67 words
A method of preparing a solar cell comprising screen printing on an n-type layer of a semiconductor wafer a paste composition consisting essentially of a mixture of silver powder and lead bismuthate glass frit powder in a vehicle and solvent mixture, heating to remove the vehicle and solvent and thereafter firing at a temperature between 550° to 750° C. for a time between one and ten minutes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |