Patent ID: 8076570

Claim:
A solar cell comprising two separate layers, a silicon layer and a contact layer deposited over a surface of the silicon layer and made from a mixture, wherein, prior to firing, the mixture comprises: a. at least one aluminum source, b. at least one boron source, and c. about 0.1 to about 10 wt % of a glass component, wherein the glass component is devoid of intentionally added lead in any form, and wherein the glass component comprises: (i) about 12 to about 50 mole % Bi 2 O 3 , (ii) about 25 to about 65 mole % SiO 2 , (iii) about 5 to about 15 mole % B 2 O 3 , and (iv) about 4 to about 26 mole % K 2 O, wherein the content of aluminum is about 50 wt% to about 85 wt % of the mixture, and wherein the content of boron is about 0.05 to about 20 wt % of the mixture.