Recent progress in all-inorganic tin-based perovskite solar cells:a review

Recently,power conversion efficiency(PCE)of organic-inorganic hybrid perovskite solar cells(PSCs)has been improved to26.1%.However,the toxicity issue of lead still hinders the large-scale commercial production and application of lead(Pb)-based halide perovskites.Fortunately,environmentally friendly tin(Sn)-based perovskites have recently shown excellent performance.Among them,the all-inorganic Sn-based perovskites,including CsSnX_(3) and Cs_(2)SnX_(6),have better stability,more suitable bandgap,and higher charge mobility,which have attracted more attention from researchers than organic-inorganic Sn-based hybrid perovskites.Herein,we review recent research progress on all-inorganic Sn-based perovskite materials and corresponding solar cell devices.Finally,we also summarize the current challenges and future research directions for this type of PSCs.