Owing to its nice performance,low cost,and simple solution-processing,organic-inorganic hybrid perovskite solar cell (PSC) becomes a promising candidate for next-generation high-efficiency solar cells.The power conversion efficiency (PCE) has boosted from 3.8% to 25.2% over the past ten years.Despite the rapid progress in PCE,the device stability is a key issue that impedes the commercialization of PSCs.Recently,all-inorganic cesium lead halide perovskites have attracted much attention due to their better stability compared with their organic-inorganic counterpart.In this progress report,we summarize the properties of CsPb(IxBr1-x)3 and their applications in solar cells.The current challenges and corresponding solutions are discussed.Finally,we share our perspectives on CsPb(IxBr1-x)3 solar cells and outline possible directions to further improve the device performance.