Improving the performances of CsPbBr3solar cells fabricated in ambient condition

Inorganic perovskite cesium lead bromide (CsPbBr3) gets extensive attention due to its superb stability and moisture-tolerance feature. Here, solution-processed CsPbBr(3)perovskite films and their based solar cells were fabricated in ambient condition. The effect of post-annealing on the properties of the CsPbBr(3)film grown and the photoelectric performance of perovskite solar cells (PSCs) have been systematically investigated, which enhances the device power conversion efficiency (PCE) from 2.67 to 5.20%. Moreover, by doping mesoporous TiO2(m-TiO2) with reduced graphene oxide (RGO), the PCE of solar cells attained an apparent enhancement and finally improved to 7.08%. Not only high-quality CsPbBr(3)perovskite films but also high-performance mesoporous PSCs were obtained by film post-annealing and electron transport layer (ETL) doping, which were all fabricated in ambient conditions.