A facile molecular precursor-based Cu(In,Ga)(S,Se)2 solar cell with 8.6% efficiency

A simple, safe, and clean molecular precursor-based solution method was developed to fabricate a Cu(In,Ga)(S,Se)(2) absorber layer. Low-cost and versatile thioacetic acid was deployed as an effective solvent and suitable sulfur source to dissolve the starting materials, generating a high power conversion efficiency of 8.6% in the final cell.