Solar cell contacts containing aluminum and at least one of boron, titanium, nickel, tin, silver, gallium, zinc, indium and copper

A solar cell comprising a contact made from a mixture wherein, prior to firing, the mixture comprises:

• a. an aluminum source, wherein the content of aluminum is about 50 to about 85 wt % of the mixture,
• b. sources of at least two additional metals selected from the group consisting of boron, titanium, nickel, tin, silver, gallium, zinc, indium, copper, mixtures thereof, and alloys thereof, wherein each of the two additional metals is present in an amount of about 0.3 to about 10 wt % of the mixture;
• and
• c. about 0.1 to about 10 wt % of a lead-free and cadmium-free glass component, wherein the glass component consists essentially of:
• (i) about 1 to about 15 mole % LhO,
• (ii) about 8 to about 25 mole % Na20,
• (iii) about 3 to about 25 mole % K20,
• (iv) about 8 to about 22 mole % Ti02,
• (v) about 25 to about 50 mole % Si02,
• (vi) about 2 to about 18 mole % V 205, and
• (vii) about 0.25 to about 5 mole % P205.