Mixed Sn–Pb perovskites with narrow bandgaps and high optical absorption coefficients are promising photovoltaic materials. However, the easy oxidation of Sn²⁺ and fast crystallization of mixed Sn–Pb perovskites still limit the efficiency of mixed Sn–Pb perovskite solar cells (PSCs). Here, an imidazole derivative 2-(Aminomethyl)imidazole dihydrochloride (2-AD) to suppress the oxidation of Sn²⁺ and improve the perovskite film quality through coordination with Sn²⁺/Pb²⁺ ions is introduced. The optimized devices show a high power conversion efficiency of 22.31% with outstanding long-term illumination stability. This work provides an effective strategy to achieve efficient and stable mixed Sn–Pb PSCs.

中文翻译：

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高效混合锡铅钙钛矿太阳能电池的咪唑衍生物辅助结晶

具有窄带隙和高光吸收系数的混合锡铅钙钛矿是有前途的光伏材料。然而，Sn ²⁺的易氧化性和混合 Sn-Pb 钙钛矿的快速结晶仍然限制了混合 Sn-Pb 钙钛矿太阳能电池（PSC）的效率。在此，介绍了一种咪唑衍生物2-(氨甲基)咪唑二盐酸盐(2-AD)，其通过与Sn ²⁺ /Pb ^{2+离子配位来抑制Sn 2+}的氧化并提高钙钛矿膜质量。优化后的器件具有 22.31% 的高功率转换效率和出色的长期照明稳定性。这项工作为实现高效稳定的混合 Sn-Pb PSC 提供了一种有效的策略。