期刊
JOURNAL OF ENERGY CHEMISTRY
卷 67, 期 -, 页码 65-72出版社
ELSEVIER
DOI: 10.1016/j.jechem.2021.09.043
关键词
Perovskite solar cells; Defect suppression; Energy level alignment; Phase transition; 4-Fluorophenylmethylammonium iodide
资金
- National Natural Science Foundation of China [62004165]
- China Postdoctoral Science Foundation [2020M670036]
- Natural Science Foundation of Shaanxi Province, China [2020JQ-195]
- Northwestern Polytechnical University [2020GXLH-Z-007, 2020GXLH-Z-025]
- Fundamental Research Funds for the Central Universities
- Department of Science & Technology of Shaanxi Province [2020GXLH-Z-007, 2020GXLH-Z-025]
4-fluorophenylmethylammonium iodide (F-PMAI) was employed to modulate the surface structure and energy level alignment of FA-based perovskite films, leading to improved optoelectronic film properties and device performance.
The vast majority of high-performance perovskite solar cells (PSCs) are based on a formamidinium lead iodide (FAPbI(3))-dominant composition. Nevertheless, the FA-based perovskite films suffer from undesirable phase transition and defects-induced non-ideal interfacial recombination, which significantly induces energy loss and hinders the improvement of device performance. Herein, we employed 4-fluorophenylmethylammonium iodide (F-PMAI) to modulate surface structure and energy level alignment of the FA-based perovskite films. The superior optoelectronic films were obtained with reduced trap density, pure alpha-phase FAPbI(3) and favorable energy band bending. The lifetime of photogenerated charge carriers increased from 489.3 ns to 1010.6 ns, and a more p-type perovskite film was obtained by the post-treatment with F-PMAI. Following this strategy, we demonstrated an improved power conversion efficiency of 22.59% for the FA-based PSCs with an open-circuit voltage loss of 399 mV. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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