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Diboron‐Assisted Interfacial Defect Control Strategy for Highly Efficient Planar Perovskite Solar Cells
Author(s) -
Tu Yongguang,
Yang Xiaoyu,
Su Rui,
Luo Deying,
Cao Yang,
Zhao Lichen,
Liu Tanghao,
Yang Wenqiang,
Zhang Yifei,
Xu Zhaojian,
Liu Quanzhen,
Wu Jihuai,
Gong Qihuang,
Mo Fanyang,
Zhu Rui
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201805085
Subject(s) - formamidinium , materials science , perovskite (structure) , halide , iodide , planar , energy conversion efficiency , hysteresis , layer (electronics) , optoelectronics , chemical engineering , nanotechnology , inorganic chemistry , condensed matter physics , chemistry , computer graphics (images) , physics , computer science , engineering
Metal halide perovskite films are endowed with the nature of ions and polycrystallinity. Formamidinium iodide (FAI)‐based perovskite films, which include large cations (FA) incorporated into the crystal lattice, are most likely to induce local defects due to the presence of the unreacted FAI species. Here, a diboron‐assisted strategy is demonstrated to control the defects induced by the unreacted FAI both inside the grain boundaries and at the surface regions. The diboron compound (C 12 H 10 B 2 O 4 ) can selectively react with unreacted FAI, leading to reduced defect densities. Nonradiative recombination between a perovskite film and a hole‐extraction layer is mitigated considerably after the introduction of the proposed approach and charge‐carrier extraction is improved as well. A champion power conversion efficiency of 21.11% is therefore obtained with a stabilized power output of 20.83% at the maximum power point for planar perovskite solar cells. The optimized device also delivers negligible hysteresis effect under various scanning conditions. This approach paves a new way for mitigating defects and improving device performance.