Effects of the incorporation amounts of CdS and Cd(SCN2H4)2Cl2 on the performance of perovskite solar cells

An excellent organolead halide perovskite film is important for the good performance of perovskite solar cells (PSCs). However, defects in perovskite crystals can affect the photovoltaic properties and stability of solar cells. To solve this problem, this study incorporated a complex of CdS and Cd(SCN2H4)2Cl2 into the CH3NH3PbI3 active layer. The effects of different doping concentrations of CdS and Cd(SCN2H4)2Cl2 on the performance and stability of PSCs were analyzed. Results showed that doping appropriate incorporation concentrations of CdS and Cd(SCN2H4)2Cl2 in CH3NH3PbI3 can improve the performance of the prepared solar cells. In specific, CdS and Cd(SCN2H4)2Cl2 can effectively passivate the defects in perovskite crystals, thereby suppressing the charge recombination in PSCs and promoting the charge extraction at the TiO2/perovskite interface. Due to the reduction of perovskite crystal defects and the enhancement of compactness of the CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 composite film, the stability of PSCs is significantly improved.