Vapor-assisted deposition of highly efficient, stable black-phase FAPbI <sub>3</sub> perovskite solar cells
Haizhou Lu(École Polytechnique Fédérale de Lausanne), Yuhang Liu(École Polytechnique Fédérale de Lausanne), Paramvir Ahlawat(École Polytechnique Fédérale de Lausanne), Aditya Mishra(Resonance Research (United States)), Wolfgang Tress(École Polytechnique Fédérale de Lausanne), Felix T. Eickemeyer(École Polytechnique Fédérale de Lausanne), Yingguo Yang(Chinese Academy of Sciences), Fan Fu(Swiss Federal Laboratories for Materials Science and Technology), Zaiwei Wang(École Polytechnique Fédérale de Lausanne), Claudia E. Avalos(Resonance Research (United States)), Brian Carlsen(École Polytechnique Fédérale de Lausanne), Anand Agarwalla(École Polytechnique Fédérale de Lausanne), Xin Zhang(Fudan University), Xiaoguo Li(Fudan University), Yiqiang Zhan(Fudan University), Shaik M. Zakeeruddin(École Polytechnique Fédérale de Lausanne), Lyndon Emsley(Resonance Research (United States)), Ursula Röthlisberger(École Polytechnique Fédérale de Lausanne), Li‐Rong Zheng(Fudan University), Anders Hagfeldt(École Polytechnique Fédérale de Lausanne), Michaël Grätzel(École Polytechnique Fédérale de Lausanne)
Cited by 786Open Access
Abstract
Moving a perovskite into the black The bandgap of the black α-phase FAPbI 3 (where FA is formamidinium) is nearly ideal for solar cells, but it is unstable with respect to the photoinactive yellow δ-phase. Lu et al. found that a film of the yellow phase was converted to a highly crystalline black phase by vapor exposure to methylammonium thiocyanate at 100°C, and it retained this structure after 500 hours at 85°C. Solar cells fabricated with this material had a power conversion efficiency of more than 23%. After 500 hours under maximum power tracking and a period of dark recovery, 94% of the original efficiency was retained. Science , this issue p. eabb8985
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