Improving the performances of CsPbBr3 solar cells fabricated in ambient condition

Inorganic perovskite cesium lead bromide (CsPbBr 3 ) 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 TiO 2 (m-TiO 2 ) 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.