One‐Stone‐for‐Multiple‐Birds Additive Strategy for Highly Efficient and Stable Carbon‐Based Hole‐Transport‐Layer‐Free CsPbI2Br Solar Cells

材料科学 制作 晶界 串联 能量转换效率 太阳能电池 镧系元素 纤锌矿晶体结构 带隙 光电子学 纳米技术 离子 发光 无机化学 复合材料 微观结构 化学 冶金 医学 替代医学 有机化学 病理
作者
Wenxuan Li,Hongbo Tong,Yali Li,Xiaoyang Liu,Guodong Wan,Xueyan Ma,Hai Liu,Zhe Gao,Yujun Fu,Deyan He,Zhenguo Li,Junshuai Li
出处
期刊:Small [Wiley]
标识
DOI:10.1002/smll.202406784
摘要

Abstract During fabrication and operation of perovskite solar cells (PSCs), defects commonly arise within the crystals as well as at grain boundaries. However, conventional additive strategies typically only serve to mitigate the occurrence of a single defect and fail to significantly enhance device performance. Herein, carbon‐based hole‐transport‐layer‐free CsPbI 2 Br devices are focused on, one kind of important PSCs with more stable structure and an appropriate bandgap for a semitransparent solar cell or a top cell in a tandem configuration, and present a highly efficient one‐stone‐for‐multiple‐birds additive strategy based on lanthanide trifluoromethanesulfonates (Ln(OTF) 3 , Ln: neodymium (Nd), europium (Eu), dysprosium (Dy), thulium (Tm)). Density functional theory calculations reveal that the Ln 3+ ions with a smaller radius can elevate defect formation energy for Pb and I vacancies within the crystals, while the presence of OTF − can effectively passivating uncoordinated Pb 2+ at grain boundaries. In addition, Ln(OTF) 3 addition increases the grain size and meanwhile reduces the surface roughness of the CsPbI 2 Br layers. All these positive contributions lead to a significant enhancement in power conversion efficiency (PCE) to 15.13% which is among the top PCEs reported for the corresponding solar cells, from 11.80% of the pristine device without Tm(OTF) 3 addition, while notably boosting long‐term stability and reducing current–voltage hysteresis.
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