All-inorganic CsPbBr3 thin-film solar cells prepared by single-source physical vapor deposition

Long-term stability and large-area are key to the commercialization of perovskite solar cells, and the allinorganic perovskite CsPbBr3 has higher stability compared to organic-inorganic hybrid perovskites. In this work, a simple single-source physical vapor deposition (SSPVD) method is proposed for the evaporation of CsPbBr3 crystal powder to deposit high-quality all-inorganic CsPbBr3 perovskite thin films. The results show that the CsPbBr3 thin films prepared by SSPVD are dense and uniform, with high crystallinity and full surface coverage. After annealing optimization, high-quality CsPbBr3 thin films with good crystallinity and uniformity were obtained. The CsPbBr3 thin film has a high visible absorption coefficient and an optical forbidden bandwidth of 2.33 eV. The CsPbBr3 perovskite thin-film solar cells prepared based on the SSPVD method have a photoelectric conversion efficiency (PCE) of 1.37% with good reproducibility and high stability. These results tentatively suggest that SSPVD is a promising method for preparing high-quality all-inorganic perovskite CsPbBr3 thin films for solar cell applications.