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Stable and Efficient Methylammonium‐, Cesium‐, and Bromide‐Free Perovskite Solar Cells by In‐Situ Interlayer Formation
Author(s) -
Wang Minhuan,
Tan Shaun,
Zhao Yepin,
Zhu Pengchen,
Yin Yanfeng,
Feng Yulin,
Huang Tianyi,
Xue Jingjing,
Wang Rui,
Han Gill Sang,
Jung Hyun Suk,
Bian Jiming,
Lee JinWook,
Yang Yang
Publication year - 2021
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.202007520
Subject(s) - formamidinium , materials science , perovskite (structure) , halide , caesium , iodide , thermal stability , phase (matter) , bromide , chemical engineering , inorganic chemistry , organic chemistry , chemistry , engineering
The vast majority of high‐performance perovskite solar cells (PSCs) are based on multi‐cation mixed‐anion compositions incorporating methylammonium (MA) and bromide (Br). Nevertheless, the thermal instability of MA and the tendency of mixed halide compositions to phase segregate limit the long‐term stability of PSCs. However, reports of MA‐free and/or Br‐free compositions are rare in the community since their performance is generally inferior. Here, a strategy is presented to achieve highly efficient and stable PSCs that are altogether cesium (Cs)‐free, MA‐free and Br‐free. An antisolvent quenching process is used to in‐situ deposit a polymeric interlayer to promote the growth of phase‐pure formamidinium lead tri‐iodide perovskite crystals with reduced defect density and to assist in photo‐excited charge extraction. The PSCs developed are among the best‐performing reported for such compositions. Moreover, the PSCs show superior stability under continuous exposure to both illumination and 85 °C heat.