Abstract:
Disclosed are aluminum paste compositions, processes to form solar cells using the aluminum paste compositions, and the solar cells so-produced. The low-siloxane aluminum paste compositions consist essentially of 0.005-2.6%, by weight of at least one siloxane; 44.5-84.9%, by weight of an aluminum powder; 0.05-5.8% of an optional indium-free additive; and 15-50%, by weight of an organic vehicle, wherein the amounts in % by weight are based on the total weight of the aluminum paste composition. The high-siloxane aluminum paste compositions comprise 15-68%, by weight of at least one siloxane; 25-84.9%, by weight of an aluminum powder; 0.1-10%, by weight of an organic vehicle.