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Minimizing buried interfacial defects for efficient inverted perovskite solar cells.

Shuo ZhangFangyuan YeXiaoyu WangRui ChenHuidong ZhangLiqing ZhanXianyuan JiangYawen LiXiaoyu JiShuaijun LiuMiaojie YuFurong YuYilin ZhangRuihan WuZonghao LiuZhijun NingDieter NeherLiyuan HanYuze LinHe TianWei ChenMartin StolterfohtLijun ZhangWei-Hong ZhuYongzhen Wu
Published in: Science (New York, N.Y.) (2023)
Controlling the perovskite morphology and defects at the buried perovskite-substrate interface is challenging for inverted perovskite solar cells. In this work, we report an amphiphilic molecular hole transporter, (2-(4-(bis(4-methoxyphenyl)amino)phenyl)-1-cyanovinyl)phosphonic acid, that features a multifunctional cyanovinyl phosphonic acid group and forms a superwetting underlayer for perovskite deposition, which enables high-quality perovskite films with minimized defects at the buried interface. The resulting perovskite film has a photoluminescence quantum yield of 17% and a Shockley-Read-Hall lifetime of nearly 7 microseconds and achieved a certified power conversion efficiency (PCE) of 25.4% with an open-circuit voltage of 1.21 volts and a fill factor of 84.7%. In addition, 1-square centimeter cells and 10-square centimeter minimodules show PCEs of 23.4 and 22.0%, respectively. Encapsulated modules exhibited high stability under both operational and damp heat test conditions.
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