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Extrinsic Ion Distribution Induced Field Effect in CsPbIBr 2 Perovskite Solar Cells
Author(s) -
Wang Yulong,
Wang Kai,
Subhani Waqas Siddique,
Zhang Congqiang,
Jiang Xiao,
Wang Shimin,
Bao Huaxi,
Liu Lu,
Wan Li,
Liu Shengzhong Frank
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201907283
Subject(s) - perovskite (structure) , materials science , energy conversion efficiency , passivation , crystallization , halide , electric field , chemical engineering , perovskite solar cell , nanotechnology , optoelectronics , inorganic chemistry , chemistry , layer (electronics) , physics , quantum mechanics , engineering
Excellent power conversion efficiency (PCE) and stability are the primary forces that propel the all‐inorganic cesium‐based halide perovskite solar cells (PSCs) toward commercialization. However, the intrinsic high density of trap state and internal nonradiative recombination of CsPbIBr 2 perovskite film are the barriers that limit its development. In the present study, a facile additive strategy is introduced to fabricate highly efficient CsPbIBr 2 PSCs by incorporating sulfamic acid sodium salt (SAS) into the perovskite layer. The additive can control the crystallization behaviors and optimize morphology, as well as effectively passivate defects in the bulk perovskite film, thereby resulting in a high‐quality perovskite. In addition, SAS in perovskite has possibly introduced an additional internal electric field effect that favors electron transport and injection due to inhomogeneous ion distribution. A champion PCE of 10.57% (steady‐output efficiency is 9.99%) is achieved under 1 Sun illumination, which surpasses that of the contrast sample by 16.84%. The modified perovskite film also exhibits improved moisture stability. The unencapsulated device maintains over 80% initial PCE after aging for 198 h in air. The results provide a suitable additive for inorganic perovskite and introduce a new conjecture to explain the function of additives in PSCs more rationally.