Effect of deposition potential on the properties of Cu2ZnSnS4 films for solar cell applications

Cu2ZnSnS4 (CZTS) films have been successfully deposited on Mo-coated glass substrates by the rapid thermal processing sulfurization of co-electroplated CZTS precursors. Effects of single-deposition potential and double-deposition potential on the properties of CZTS films and CZTS solar cells were investigated. The CZTS films deposited by double-deposition potential show a relatively flat surface and sufficient sulfurization, reduce considerably the thickness of MoS2 interfacial layer and thereby improve the device efficiency greatly by the boost of Jsc and Voc compared with those deposited by single-deposition potential. The solar cell fabricated with the CZTS absorber deposited by double-deposition potential achieves a conversion efficiency of >3.06%.