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吸电子配体晶界应力调控实现高效稳定锡基钙钛矿太阳能电池（李培舟 ACS Energy Lett. 2020, 5, 2327−2334）
发布者: 吴朝新 | 2020-06-30 | 7184

 

Ligand Orientation-Induced Lattice Robustness for Highly Effiffifficient and Stable Tin Based Perovskite Solar Cells

 

Peizhou Li, Hua Dong,* Jie Xu, Jinbo Chen, Bo Jiao, Xun Hou, Jingrui Li,* and Zhaoxin Wu*
 
 
Low-toxicity tin-based perovskites have exhibited huge potential for photovoltaics applications. However, the facile oxidation of Sn2+ to Sn4+ induces ubiquitous Sn vacancies and p-type doping in perovskite fifilms. In addition, the fast crystallization easily leads to poor film morphology and high defect concentration. In this work, we developed a fifilm-formation strategy via the flfluoro-aniline isomers medium and achieved the simultaneous restriction of Sn2+ oxidation and regulation of crystallization. The ortho-flfluorine ligand, which exhibits unidirectional and bent geometry at the surface, could contribute to the lattice robustness with better restriction of Sn vacancy formation, compared with the bidirectional and vertical ligands. The resulting perovskite solar cell (PSC) device modifified by 2-F-PEA shows a considerable PCE of 10.17% (certifified 8.58%), with an effiffifficiency attenuation of less than 15% under 1600 h of light aging testing. Our fifindings could provide a new avenue for the enhancement of both effiffifficiency and stability of tin-based PSCs.
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