Superstrate type CZTS solar cell with all solution processed functional layers at low temperature

Abstract A new molecular precursor for Cu2ZnSnS4 (CZTS) has been explored for the fabrication of efficient superstrate type solar cells with all solution processed functional layers at low temperature. The CZTS film made at low temperature (250 °C), without sulfurization was employed in the heterojunction device with a thin interface layer of CdS and the one-step hydrothermally processed rutile TiO2 nanorod arrays. The quality of the CZTS film was optimized by varying the composition of Cu and Zn in the precursor solution. Initial devices with (FTO/TiO2/CdS/CZTS/Au) structure exhibited the power conversion efficiency up to 1.04%, on par with the best in the relevant literature.