Perovskite solar cells (PSCs) are promising for high‐efficiency tandem applications, but their long‐term stability, particularly due to ion migration, remains a challenge. Despite progress in stabilizing PSCs, they still fall short compared to mature technologies like silicon. This study explores how different piperazinium salt treatments using iodide, chloride, tosylate, and bistriflimide anions affect the energetics, carrier dynamics, and stability of 1.68 eV bandgap PSCs. Chloride‐based treatments achieved the highest power conversion efficiency (21.5%) and open‐circuit voltage (1.28 V), correlating with stronger band bending and n‐type character at the surface. At the same time, they showed reduced long‐term stability due to increased ionic losses. Tosylate‐treated devices offered the best balance, retaining 96.4% efficiency after 1000 h (ISOS‐LC‐1I). These findings suggest that targeted surface treatments can enhance both efficiency and stability in PSCs.

中文翻译：

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1.68 eV 宽带隙钙钛矿太阳能电池中能带弯曲和离子损耗的相关性


钙钛矿太阳能电池 （PSC） 有望用于高效串联应用，但其长期稳定性，特别是由于离子迁移，仍然是一个挑战。尽管在稳定 PSC 方面取得了进展，但与硅等成熟技术相比，它们仍然不足。本研究探讨了使用碘化物、氯化物、甲苯磺酸盐和双歧酰亚胺阴离子的不同哌嗪盐处理如何影响 1.68 eV 带隙 PSC 的能量、载流子动力学和稳定性。基于氯的处理实现了最高的功率转换效率 （21.5%） 和开路电压 （1.28 V），这与表面更强的带弯曲和 n 型特性相关。同时，由于离子损失增加，它们的长期稳定性降低。甲苯磺酸盐处理的装置提供了最佳平衡，在 1000 小时后保持 96.4% 的效率 （ISOS-LC-1I）。这些发现表明，有针对性的表面处理可以提高 PSC 的效率和稳定性。