Microstructures, optical and photovoltaic properties of CH3NH3PbI3(1-x)Clx perovskite films with CuSCN additive

Microstructures, optical and photovoltaic properties ofCH(3)NH(3)PbI(3(1-x))Cl(x) perovskite films with copper(I) thiocyanate (CuSCN) additive were investigated. The CuSCN-addedCH(3)NH(3)PbI(3(1-x)) Cl-x films were prepared by a hot air blow-assisted spin-coating method. Current density-voltage characteristics of the photovoltaic device using the CuSCN-addedCH(3)NH(3)PbI(3(1-x))Cl(x) light-absorbing layer showed increases in short-circuit current density, open-circuit voltage, which resulted in increase in the conversion efficiency. Microstructure analysis showed that the crystal structure of the CuSCN-addedCH(3)NH(3)PbI(3(1-x))Cl(x) was a pseudocubic system. From these results, partial substitutions of Pb2+ and anions (I- and Cl-) by Cu ions (Cu+ and Cu2+) and SCN-, respectively, are considered to occur in the CuSCN-addedCH(3)NH(3)PbI(3(1-x))Cl(x) films. Based on the obtained results, reaction mechanisms of theCH(3)NH(3)PbI(3(1-x))Cl(x) films with and without CuSCN additive were discussed.