Polycrytalline, thin-film Cu2S/Cd1−xZnxS heterojunction solar cells with conversion efficiencies of 10% have been prepared on Cd1−xZnxS 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.
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Hall et al. (1981) studied this question.