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NbF 5 : A Novel α‐Phase Stabilizer for FA‐Based Perovskite Solar Cells with High Efficiency
Author(s) -
Yuan Shihao,
Qian Fang,
Yang Shaomin,
Cai Yuan,
Wang Qiang,
Sun Jie,
Liu Zhike,
Liu Shengzhong Frank
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201807850
Subject(s) - perovskite (structure) , materials science , orthorhombic crystal system , energy conversion efficiency , phase (matter) , chemical engineering , relative humidity , optoelectronics , crystallography , organic chemistry , chemistry , crystal structure , thermodynamics , engineering , physics
The HC(NH 2 ) 2 + (FA + ) is a well‐known substitute to CH 3 NH 3 + (MA + ) for its capability to extend light utilization for improved power conversion efficiency for perovskite solar cells; unfortunately, the dark cubic phase (α‐phase) can easily transition to the yellow orthorhombic phase (δ‐phase) at room temperature, an issue that prevents its commercial application. In this report, an inorganic material (NbF 5 ) is developed to stabilize the desired α‐phase perovskite material by incorporating NbF 5 additive into the perovskite films. It is found that the NbF 5 additive effectively suppresses the formation of the yellow δ‐phase in the perovskite synthesis and aging process, thus enhancing the humidity and light‐soaking stability of the perovskite film. As a result, the perovskite solar cells with the NbF 5 additive exhibit improved air stability by tenfold, retaining nearly 80% of their initial efficiency after aging in air for 50 d. In addition, under full‐sun AM 1.5 G illumination of a xenon lamp without any UV‐reduction, the perovskite solar cells with the NbF 5 additive also show fivefold improved illumination stability than the control devices without NbF 5 .