Rational Design and Optimization of the Band Gap and p-Type Doping in High-Efficiency CdTe Solar Cells through CuSeCN Treatment

, the FF increased from 58.11 to 70.06%, and the power conversion efficiency was 17.48%. These results confirmed that CuSeCN is a promising candidate for both efficient carrier doping and lowering the band gaps of CdTe-based SCs.