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Abstract
Recently, inorganic ${\rm{CsPbB}}{{\rm{r}}_3}$ perovskites have received much research interest in the photovoltaic field owing to their excellent stability. However, it is still challenging to prepare high-performance ${\rm{CsPbB}}{{\rm{r}}_3}$ films with good crystallinity and superior morphology at moderate temperatures. In this work, we report a novel, to the best of our knowledge, multistep spin-coating deposition method to prepare ${\rm{CsPbB}}{{\rm{r}}_3}$ perovskite film. Through optimizing the number of deposition cycles of a CsBr solution, ${\rm{CsPbB}}{{\rm{r}}_3}$ films containing high phase purity, good crystallinity, and strong absorption are obtained. The inorganic planar perovskite solar cell with optimized ${\rm{CsPbB}}{{\rm{r}}_3}$ film realizes a maximum power conversion efficiency of 4.70% under standard solar illumination conditions. Moreover, our devices with ${\rm{FTO}}/{\rm{Ti}}{{\rm{O}}_2}/{\rm{CsPbB}}{{\rm{r}}_3}/{\rm{CuPc}}/{\rm{C}}$ exhibit fabulous stability when stored in an ambient atmosphere with ${\sim}{{40}}\%$ humidity for 60 days. Our work provides new opportunities for facilitating practical application of ${\rm{CsPbB}}{{\rm{r}}_3}$ planar perovskite solar cells.
© 2020 Optical Society of America
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