By comparing optical spectral results of both Sn-rich and Sn-poor Cu2ZnSnS4(CZTS)with the previously calculated defect levels,we confirm that the band-tail states in CZTS originate from the high conce
Kesterite-based Cu2ZnSn(S,Se)4 semiconductors are emerging as promising materials for low-cost,environment-benign,and high-efficiency thin-film photovoltaics.