Thin-film polycrystalline Cu2S/Cd1−xZnx S solar cells of 10% efficiency

Abstract

Polycrytalline, thin‐film Cu₂S/Cd_1−xZn_xS heterojunction solar cells with conversion efficiencies of 10% have been prepared on Cd_1−xZn_xS with 0.1⩽x⩽0.2. Light‐generated currents of up to 26 mA/cm² (prorated to 100 mW/cm²) have been achieved, comparable to the best observed in Cu₂S/CdS cells of the same design. The improved performance for Cu₂S‐based devices is as a consequence of the higher open‐circuit voltage achieved with the addition of zinc.