The synthesis of multicomponent metal halide perovskites (MHPs) by cationic and/or halide alloying allows band gap tuning, optimizing performance and improving stability. However, these multicomponent materials often suffer from compositional, structural, and property inhomogeneities, leading to uneven carrier transport and significant non‐radiative recombination losses in lead halide perovskites. While many researchers have focused on the aggregation of perovskite halide ions, the impact of the surface potential has received relatively less attention. In this study, the multifunctional ionic liquid 1‐allyl‐3‐methylimidazole dicyanamide (AMI) is introduced into the perovskite precursor to effectively regulate the surface potential of the perovskite layer. This approach inhibits non‐radiative recombination, enhances carrier injection, and improves device performance. Surface potential homogenization within the perovskite layer leads to simultaneous improvements in both the efficiency and stability of perovskite solar cells. For wide‐bandgap perovskites (1.81 eV), the optimal power conversion efficiency (PCE) reaches 20.44%, with an open‐circuit voltage (Voc) of 1.339 V, a short‐circuit current density (Jsc) of 17.92 mA cm−2, and a high fill factor (FF) of 85%. This strategy also proved effective for conventional bandgap perovskite solar cells (PSCs) (1.53 eV), leading to a significant increase in performance, with the PCE increasing from 23.22% to 25.41%.

中文翻译：

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表面电位均质提高了钙钛矿太阳能电池的性能


通过阳离子和/或卤化物合金合成多组分金属卤化物钙钛矿 （MHP） 可实现带隙调整、优化性能并提高稳定性。然而，这些多组分材料通常存在成分、结构和性能不均匀性，导致卤化铅钙钛矿的载流子传输不均匀和显着的非辐射复合损失。虽然许多研究人员都专注于钙钛矿卤化物离子的聚集，但表面电位的影响受到的关注相对较少。在本研究中，将多功能离子液体 1-烯丙基-3-甲基咪唑二氰胺 （AMI） 引入钙钛矿前驱体中，以有效调节钙钛矿层的表面电位。这种方法抑制了非辐射复合，增强了载流子注入，并提高了器件性能。钙钛矿层内的表面电位均质化导致钙钛矿太阳能电池的效率和稳定性同时提高。对于宽带隙钙钛矿 （1.81 eV），最佳功率转换效率 （PCE） 达到 20.44%，开路电压 （Voc） 为 1.339 V，短路电流密度 （Jsc） 为 17.92 mA cm-2，填充因子 （FF） 为 85%。该策略也被证明对传统的带隙钙钛矿太阳能电池 （PSC） （1.53 eV） 有效，导致性能显着提高，PCE 从 23.22% 增加到 25.41%。