In this paper, three kinds of SnO2 precursors were comparatively investigated for low temperature solution-processed SnO2 films as electron transport layers (ETL) of CsPbBr3 perovskite solar cells (PSCs). It was found that the precursor state and solvent type played an important role on the crystallinity and film-forming performance of SnO2. All-inorganic hole-transport-layer-free planar CsPbBr3 PSCs with an architecture of FTO/SnO2/CsPbBr3/carbon were fabricated. The best-performing device with SnO2 as ETL by reflux condensation sol spin-coating technique delivered a champion power conversion efficiency (PCE) as high as 6.27%, with a short-circuit current density of 7.36[Formula: see text]mA[Formula: see text]cm[Formula: see text], an open-circuit voltage of 1.29[Formula: see text]V, and a fill factor of 65.9%. It was comparable to the highest PCE record 6.7% of the device with the same structure based on TiO2-ETL so far. Moreover, the CsPbBr3 devices without encapsulation exhibited good stability after being stored under ambient conditions with a relative humidity of [Formula: see text]% at room temperature over 1000[Formula: see text]h and 60[Formula: see text]C for 720[Formula: see text]h, respectively. The results promise the commercial potential of CsPbBr3 PSCs using reflux condensation low-temperature solution-processed SnO2 as ETLs for flexible polymer photovoltaic applications.

中文翻译：

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前驱体对溶液处理 SnO2 作为 CsPbBr3 钙钛矿太阳能电池电子传输层的依赖性

在本文中，三种 SnO2对低温溶液处理的 SnO 前驱体进行了比较研究2薄膜作为 CsPbBr 的电子传输层 (ETL)3钙钛矿太阳能电池（PSC）。研究发现，前驱体状态和溶剂类型对 SnO 的结晶度和成膜性能有重要影响。2. 全无机空穴传输层无平面CsPbBr3具有 FTO/SnO 架构的 PSC2/CsPbBr3/碳是制造出来的。性能最佳的 SnO 器件2由于采用回流冷凝溶胶旋涂技术的ETL，其功率转换效率（PCE）高达6.27%，短路电流密度为7.36[公式：见正文]mA[公式：见正文]cm[公式：见正文]，开路电压为 1.29[公式：见正文]V，填充因子为 65.9%。它与基于 TiO2 的具有相同结构的器件的最高 PCE 记录 6.7% 相当2-ETL 到目前为止。此外，CsPbBr3没有封装的器件在室温下储存在相对湿度为 [公式：见文本]% 超过 1000[公式：见文本]h 和 60[公式：见文本]C 的 720 [公式：见文本]h，分别。该结果保证了 CsPbBr 的商业潜力3使用回流冷凝低温溶液处理的 SnO 的 PSC2作为柔性聚合物光伏应用的ETL。