Wang Xue, Zhang Dong, Liu Baoze, Wu Xin, Jiang Xiaofen, Zhang Shoufeng, Wang Yan, Gao Danpeng, Wang Lina, Wang Haolin, Huang Zongming, Xie Xiangfan, Chen Tao, Xiao Zhengguo, He Qiyuan, Xiao Shuang, Zhu Zonglong, Yang Shangfeng
CAS Key Laboratory of Materials for Energy Conversion, Anhui Laboratory of Advanced Photon Science and Technology, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China.
Department of Chemistry, City University of Hong Kong, Kowloon, 999077, Hong Kong.
Adv Mater. 2023 Dec;35(49):e2305946. doi: 10.1002/adma.202305946. Epub 2023 Oct 26.
Perovskite/organic tandem solar cells (POTSCs) are gaining attention due to their easy fabrication, potential to surpass the S-Q limit, and superior flexibility. However, the low power conversion efficiencies (PCEs) of wide bandgap (Eg) perovskite solar cells (PVSCs) have hindered their development. This work presents a novel and effective mixed-cation passivation strategy (CE) to passivate various types of traps in wide-Eg perovskite. The complementary effect of 4-trifluoro phenethylammonium (CF -PEA , denoted as CA ) and ethylenediammonium (EDA , denoted as EA ) reduces both electron/hole defect densities and non-radiative recombination rate, resulting in a record open-circuit voltage (V ) of wide-Eg PVSCs (1.35 V) and a high fill factor (FF) of 83.29%. These improvements lead to a record PCE of 24.47% when applied to fabricated POTSCs, the highest PCE to date. Furthermore, unencapsulated POTSCs exhibit excellent photo and thermal stability, retaining over 90% of their initial PCE after maximum power point (MPP) tracking or exposure to 60 °C for 500 h. These findings imply that the synergic effect of surface passivators is a promising strategy to achieve high-efficiency and stable wide-Eg PVSCs and corresponding POTSCs.
钙钛矿/有机串联太阳能电池（POTSCs）因其易于制造、有潜力超越肖克利-奎伊瑟（S-Q）极限以及卓越的柔韧性而备受关注。然而，宽带隙（Eg）钙钛矿太阳能电池（PVSCs）的低功率转换效率（PCEs）阻碍了它们的发展。这项工作提出了一种新颖且有效的混合阳离子钝化策略（CE），以钝化宽带隙钙钛矿中的各种类型陷阱。4-三氟苯乙铵（CF -PEA，记为CA）和乙二铵（EDA，记为EA）的互补效应降低了电子/空穴缺陷密度和非辐射复合率，从而使宽带隙PVSCs的开路电压（V）达到创纪录的1.35 V，填充因子（FF）高达83.29%。这些改进使得应用于制造的POTSCs时，PCE达到创纪录的24.47%，这是迄今为止的最高PCE。此外，未封装的POTSCs表现出优异的光稳定性和热稳定性，在最大功率点（MPP）跟踪或在60°C下暴露500小时后，仍保留其初始PCE的90%以上。这些发现表明，表面钝化剂的协同效应是实现高效且稳定的宽带隙PVSCs及相应POTSCs的一种有前景的策略。
