The open-circuit voltage (VOC) loss for wide-bandgap (WBG) perovskite solar cells (PSCs) is a significant obstacle to their further development. Herein, we introduce a dual approach involving mixed potassium thiocyanate and potassium chloride (KSCN+KCl) additives combined with 2-thiophene methylamine iodine (2-ThMAI) post-passivation strategy to mitigate VOC loss in WBG PSCs. In the mixed additives, KSCN can expand the grains and reduce the grain boundary, while KCl can inhibit the migration of halogen ions, effectively preventing phase segregation in WBG perovskites under the combination of both. However, due to the substantial energy level mismatch at the perovskite/electron transport layer (ETL) interface, suppressing phase segregation alone is insufficient to reduce the VOC loss. Therefore, introducing 2-ThMAI interface passivation could uniform spatial distribution of perovskite surface potential, promote energetic alignment at perovskite/electron transport layer interface, and further reduce the VOC loss. With these optimizations, the champion WBG PSCs achieved an enhanced VOC of 1.327 V and a promising power conversion efficiency (PCE) of 19.44 %. Additionally, these modified WBG PSCs retained 94 % of their initial efficiency after 500 hours of continuous light soaking at maximum power point tracking in ambient conditions.

中文翻译：

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添加剂和界面钝化双重协同策略可降低宽带隙钙钛矿太阳能电池的电压损耗


宽带隙（WBG）钙钛矿太阳能电池（PSC）的开路电压（VOC）损耗是其进一步发展的重大障碍。在此，我们介绍了一种双重方法，涉及混合硫氰酸钾和氯化钾（KSCN + KCl）添加剂与2-噻吩甲胺碘（2-ThMAI）后钝化策略相结合，以减少WBG PSC中的VOC损失。混合添加剂中，KSCN可以扩大晶粒，减少晶界，而KCl可以抑制卤素离子的迁移，两者结合有效防止WBG钙钛矿中的相偏析。然而，由于钙钛矿/电子传输层（ETL）界面处存在显着的能级不匹配，仅抑制相分离不足以减少VOC损失。因此，引入2-ThMAI界面钝化可以均匀钙钛矿表面电势的空间分布，促进钙钛矿/电子传输层界面的能量排列，并进一步减少VOC损失。通过这些优化，冠军 WBG PSC 的 VOC 提高到了 1.327 V，功率转换效率 (PCE) 达到了 19.44%。此外，在环境条件下以最大功率点跟踪连续浸光 500 小时后，这些改进的 WBG PSC 仍保留了 94% 的初始效率。