To promote commercialization of perovskite solar cells (PSCs), low-temperature processed electron transport layer (ETL) with high carrier mobility still needs to be further developed. Here, we reported two-dimensional (2D) tin disulfide (SnS₂) nanosheets as ETL in PSCs for the first time. The morphologies of the 2D SnS₂ material can be easy controlled by the in situ synthesized method on the conductive fluorine-doped tin oxide (FTO) substrate. We achieved a champion power conversion efficiency (PCE) of 13.63%, with the short-circuit current density (J_SC) of 23.70 mA/cm², open-circuit voltage (V_OC) of 0.95 V, and fill factor (FF) of 0.61. The high J_SC of PSCs results from effective electron collection of the 2D SnS₂ nanosheets from perovskite layer and fast electron transport to the FTO. The low V_OC and FF are the results of the lower conduction band of 2D SnS₂ (4.23 eV) than that of TiO₂ (4.0 eV). These results demonstrate that 2D material is a promising candidate for ETL in PSCs.

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为了促进钙钛矿太阳能电池（PSC）的商业化，仍需要进一步开发具有高载流子迁移率的低温处理电子传输层（ETL）。在这里，我们首次报道了二维（2D）二硫化锡（SnS ₂）纳米片作为PSC中的ETL。2D SnS ₂材料的形貌可以通过在导电掺氟氧化锡（FTO）衬底上的原位合成方法轻松控制。我们的冠军功率转换效率（PCE）为13.63％，短路电流密度（J _SC）为23.70 mA / cm ²，开路电压（V _OC）为0.95 V，填充系数（FF） 0.61。高PSC的J _SC来自钙钛矿层中2D SnS ₂纳米片的有效电子收集以及快速电子传输至FTO的结果。低V _OC和FF是2D的SnS的下导带的结果₂（4.23 eV）的比的TiO ₂（4.0电子伏特）。这些结果表明，二维材料是PSC中ETL的有希望的候选者。

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