Thick film silver metallizations for silicon solar cells
AssigneeE. I. Du Pont de Nemours and Company
InventorChristopher R. S. Needes
Life of this patent
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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.
Claims3
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.degree. to 750.degree. C.
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.degree. to 750.degree. C. for a time between one and ten minutes.
Dependencies are inferred from the claim text.