材料科学
串联
钙钛矿(结构)
能量转换效率
光伏系统
原位
光电子学
同种类的
结晶
制作
纳米技术
化学工程
量子效率
纳米棒
平面的
四硫富瓦烯
调制(音乐)
钙钛矿太阳能电池
量子点
纳米线
作者
Fenqi Du,Ting Zhang,Wenjing Zhu,Annan Zhu,Jianfeng Liu,Zhi Wan,Yuexin Lin,Wenhan Yang,Xianqiang Xie,Kai Xiang,Yingjie Zhu,Wenye Jiang,Ruxin Guo,Xiaolong Liu,Laju Bu,Nan Zhang,Junmin Xia,Long Jiang,Pengwei Li,Shengchun Yang
标识
DOI:10.1002/adma.202519486
摘要
All-perovskite tandem solar cells (TSCs) show great promise as the next-generation photovoltaic technology with high theoretical efficiency and low fabrication cost. However, further progress in the TSCs is critically hampered by the subpar performance of mixed tin-lead narrow-bandgap bottom subcells, which arises from the uncontrolled crystallization, unbalanced Sn2+ oxidation, and undesirable band alignment. Here, we develop an in situ dual-interface modulation strategy for tin-lead (Sn─Pb) perovskite solar cells (PSCs) by incorporating planar rigid tetrathiafulvalene (TTF) into the precursor solution. The interactions between electron donor TTF and Sn─Pb perovskite precursor constituents, coupled with the in situ self-assembled dual-interface enrichment of TTF, collectively regulate the crystallization dynamics, homogenize the Sn oxidation states, facilitate the carrier extraction and transport in the perovskite bulk and dual interfaces, and stabilize the perovskite structure. Such improvements enable homogeneous single-junction Sn─Pb PSCs to achieve a champion power conversion efficiency (PCE) of 24.30%, together with a record-high fill factor of 83.59% and excellent stability. Furthermore, we obtained a high PCE of 29.14% (certified 29.07%) in all-perovskite TSCs. Encapsulated tandem retains 80% of its initial efficiency following 964 h of maximum power point tracking under simulated 1-sun illumination in ambient air.
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