Patent ID: 7718093

Claim:
A backside electrode of a solar cell, comprising: (a) a solar cell substrate; (b) a first electrode formed on the solar cell substrate, wherein the first electrode comprises Al; and (c) a second electrode partially overlapping the first electrode, wherein the second electrode has been formed from a paste comprising: (i) 40-93 weight percent, based on the total weight of the paste, of metal particles selected from the group consisting of Cu, Au, Ag, Pd, Pt, alloys of Cu, alloys of Au, alloys of Ag, alloys of Pd, alloys of Pt, and mixtures thereof; said metal particles having an average particle diameter in the range of 3.0 to 15.0 μm; (ii) 2-10 weight percent, based on the total weight of the paste, of glass particles; the softening point of said glass particles being in the range of 450-550° C., and (iii) 5- 50 weight percent, based on the total weight of the paste, of an organic vehicle.