Recently, the power conversion efficiency (PCE) of perovskite solar cells (PSC) based on organic‐inorganic hybrid Pb halide perovskites has reached 25.2 %. However, the toxicity of Pb has still been a main concern for the large‐scale commercialization of Pb‐based PSCs. Efforts have been made during the past few years to seek eco‐friendly Pb‐free perovskites, and it is a growing consensus that Sn is the best choice as Pb alternative over any other Pb‐free metal elements. Among Sn‐based perovskites, all‐inorganic cells are promising candidates for PSCs owing to their more suitable bandgap, better stability, and higher charge mobility compared to the organic‐inorganic hybrid counterparts. However, the poor phase stability of all‐inorganic Sn‐based perovskites (AISPs) and low PCE of their PSCs are most challenging in the field at present. Herein, recent developments on PSCs based on AISPs, including CsSnX₃ and Cs₂SnX₆ (X=Br, I), are comprehensively reviewed. Primarily, the intrinsic characteristics of the two AISPs are overviewed, including crystallographic property, band structure, charge carrier property, and defect property. Sequentially, state‐of‐the‐art progress, regarding the photovoltaic application of AISPs as light absorber, is summarized. At last, current challenges and future opportunities of AISP‐based PSCs are also discussed.

中文翻译：

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全无机锡基钙钛矿太阳能电池：现状，挑战和前景。

近来，基于有机-无机杂化的Pb卤化物钙钛矿的钙钛矿太阳能电池（PSC）的功率转换效率（PCE）已达到25.2％。但是，Pb的毒性仍然是基于Pb的PSC大规模商业化的主要关注点。在过去的几年中，人们一直在努力寻求生态友好的无铅钙钛矿，而与其他无铅金属元素相比，锡是替代铅的最佳选择，这一共识正在日益增长。在基于Sn的钙钛矿中，与有机-无机杂种相比，全无机细胞具有更合适的带隙，更好的稳定性和更高的电荷迁移率，因此有望成为PSC的候选材料。但是，目前，全无机锡基钙钛矿（AISP）的相稳定性差以及其PSC的PCE较低，这在该领域最具挑战性。在这里全面审查了₃和Cs ₂ SnX ₆（X = Br，I）。首先，概述了两种AISP的固有特性，包括晶体学性质，能带结构，电荷载流子性质和缺陷性质。依次总结了有关AISP作为光吸收剂的光伏应用的最新进展。最后，还讨论了基于AISP的PSC的当前挑战和未来机遇。