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）
发布时间：2020-06-30
点击次数：
- 发布时间：
- 2020-06-30
- 文章标题：
- 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）
- 内容：
- Ligand Orientation-Induced Lattice Robustness for Highly Effiffifficient and Stable Tin Based Perovskite Solar CellsPeizhou 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 Sn 2+ to Sn 4+ induces ubiquitous Sn vacancies and p-type doping in perovskite fifi lms. In addition, the fast crystallization easily leads to poor fi lm morphology and high defect concentration. In this work, we developed a fifi lm-formation strategy via the flfl uoro-aniline isomers medium and achieved the simultaneous restriction of Sn 2+ oxidation and regulation of crystallization. The ortho- flfl uorine 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 modi fifi ed by 2-F-PEA shows a considerable PCE of 10.17% (certi fifi ed 8.58%), with an e ffiffiffi ciency attenuation of less than 15% under 1600 h of light aging testing. Our fifi ndings could provide a new avenue for the enhancement of both e ffiffiffi ciency and stability of tin-based PSCs.