Wide bandgap (WBG) perovskites through tuning iodine/bromine ratios are capable of merging with narrow bandgap organic bulk heterojunctions to construct tandem solar cells to overcome the Shockley–Queisser limitation. However, WBG perovskites readily suffer from light-induced halide ion migration, leading to detrimental phase segregation and hence severe open-circuit voltage (V_OC) loss. Here, to solve this issue, lead thiocyanate (Pb(SCN)₂) and 2-thiopheneethylammonium chloride (TEACl) are synergistically employed to passivate and stabilize WBG perovskites with 1.79 eV bandgap. It is demonstrated that the synergetic employment of Pb(SCN)₂ and TEACl suppresses light-induced phase segregation, passivates WBG perovskite defects, and reduces non-radiative recombination, hence alleviating V_OC loss. As a result, optimized WBG perovskite solar cells (PSCs) are obtained with an impressive V_OC of 1.26 V and power conversion efficiency (PCE) over 17.0%. Furthermore, the interconnection layer is optimized to minimize the V_OC loss and construct two-terminal perovskite/organic tandem solar cells with a narrow bandgap organic blend bulk heterojunction of PM6:Y6 and achieve a champion PCE of 22.29% with a high V_OC of 2.072 V. In addition, these tandem solar cells maintain 81% of their initial efficiency after 1000 h continuous tracking at the maximum power point (MPP) under 100 mW cm⁻² white light illumination.

中文翻译：

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抑制宽禁带钙钛矿中的相分离，用于单片钙钛矿/有机串联太阳能电池，降低电压损失

通过调整碘/溴比，宽带隙 (WBG) 钙钛矿能够与窄带隙有机本体异质结合并，构建串联太阳能电池，以克服肖克利-奎塞尔限制。然而，WBG 钙钛矿很容易受到光诱导的卤化物离子迁移的影响，导致有害的相分离，从而导致严重的开路电压 ( V _OC ) 损失。在这里，为了解决这个问题，硫氰酸铅 (Pb(SCN) ₂ ) 和 2-噻吩乙基氯化铵 (TEACl) 协同使用来钝化和稳定带隙为 1.79 eV 的 WBG 钙钛矿。结果表明，Pb(SCN) _{2的协同使用}TEACl 抑制光诱导的相分离，钝化 WBG 钙钛矿缺陷，减少非辐射复合，从而减轻V _OC损失。因此，优化的 WBG 钙钛矿太阳能电池 (PSC) 获得了令人印象深刻的1.26 V V _{OC和超过 17.0% 的功率转换效率 (PCE)。}此外，互连层经过优化以最大限度地减少V _OC损失，并构建具有 PM6:Y6 窄带隙有机混合本体异质结的两端钙钛矿/有机串联太阳能电池，并实现 22.29% 的冠军 PCE 和高V _OC^{为 2.072 V。此外，这些串联太阳能电池在 100 mW cm -2}白光照明下以最大功率点 (MPP) 连续跟踪 1000 小时后仍保持其初始效率的 81%。