CH3NH3+ and Pb immobilization through PbI2 binding by organic molecule doping for homogeneous organometal halide perovskite films
CH3NH3+ and Pb immobilization through PbI2 binding by organic molecule doping for homogeneous organometal halide perovskite films
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通过有机分子掺杂结合 PbI2 固定 CH3NH3 和 Pb，用于均质有机金属卤化物钙钛矿薄膜
DOI：
10.1039/d2ta01340a
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发表时间：
2022
影响因子：
11.9
通讯作者：
Yue Zheng
中科院分区：
文献类型：
--
作者：
He Jiang;Qianqian Yao;Xiaoyue Zhang;Bangmin Zhang;Weiwei Xing;Yijing Sun;Weiming Xiong;Xin Luo;Wenpeng Zhu;Yue Zheng
有机分子掺杂是提高有机金属卤化物钙钛矿多晶薄膜性能和可持续性的主要策略之一。然而，人们对有机分子掺杂的解释机制知之甚少，限制了钙钛矿太阳能电池（PSC）的发展。在这里，我们重新审视常规钙钛矿薄膜并研究两种典型有机分子的掺杂效应。通过 PCBM 和 PMMA 掺杂，CH3NH3PbI3 薄膜在晶体结构、化学成分、表面形貌和电势方面表现出更高的均匀性。有机分子与PbI2的结合抑制了Pb的迁移和CH3NH3+空位的聚集。 PMMA 诱导 CH3NH3PbI3 纳米纤维的形成，从而桥接晶粒并增加晶粒间的连接性。掺杂有机分子的CH3NH3PbI3薄膜的光生载流子寿命增加了五倍（>1μs），同时光电转换效率和稳定性也得到了提高。我们的工作深入了解了钙钛矿薄膜中有机分子的掺杂，并为进一步优化 PSC 铺平了道路。
Organic molecule doping is one of the main strategies to enhance the performance and sustainability of organometal halide perovskite polycrystalline films. However, the mechanisms for interpreting organic molecule doping are poorly understood, limiting the development of perovskite solar cells (PSCs). Herein, we revisit regular perovskite films and study the doping effects of two typical organic molecules. With PCBM and PMMA doping, the CH3NH3PbI3 films showed higher homogeneity in their crystalline structure, chemical composition, surface topography and potential. The binding of organic molecules to PbI2 inhibited the migration of Pb and the aggregation of CH3NH3+ vacancies. PMMA induced the formation of CH3NH3PbI3 nanofibers, which bridged the grains and increased the intergrain connectivity. The CH3NH3PbI3 films doped with organic molecules showed a five-fold increase in photoexcited carrier lifetime (>1 μs) with an enhanced photoelectric conversion efficiency and stability. Our work offers insight into the doping of organic molecules in perovskite films and paves the way for the further optimization of PSCs.