Improvement of photovoltaic performance of perovskite solar cells with a ZnO/Zn2SnO4 composite compact layer

In this study, ZnO/Zn 2 SnO 4 (ZSO) composite is synthesized as a promising alternative compact layer to TiO 2 by spray pyrolysis method. Owing to the ZnO/ZSO composite possesses higher carrier mobility and suitable band gap structure, it will behave well in the application of solar cells. The characterization results show that the ZnO/ZSO composite compact layer manifests better optical transmittance , enhanced electrons collective efficiency and superior electrical conductivity . Consequently, the corresponding photo-current is improved effectively when compared with that of TiO 2 compact layer. The optimum efficiency of perovskite solar cell based on the ZnO/ZSO composite compact layer reaches 12.03% at AM 1.5 solar light of 100   mW   cm −2 , which is 18% higher than that of perovskite solar cell based on the TiO 2 compact layer.