Electroless Nucleation and Growth of Cu-Se Phases on Molybdenum In Cu(II)-In(III)-Se(IV) Solutions

摘要

Surface reactions of molybdenum-covered glass plates, used as back contact for thin Cu(In,Ga)(S,Se)_2 solar cells, are examined at open circuit in acidic electrolytes used for plating CuInSe_2 layers. A multinary element cementation reaction occurs, leading to the corrosion of molybdenum and the formation of CuSe_2 electroless deposit (x from 0.2 to 0.8), with well-defined compositions. Immediately after immersion, small nuclei appear on the surface, which then grow to form a quasi-continuous layer. The time evolution of the open-circuit potential of Mo and the Se/Cu surface atomic ratio are correlated and are in agreement with thermodynamic data predictions.