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- Title
Stable and Efficient Methylammonium‐, Cesium‐, and Bromide‐Free Perovskite Solar Cells by In‐Situ Interlayer Formation.
- Authors
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, Jin‐Wook; Yang, Yang
- Abstract
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.
- Subjects
PEROVSKITE; SOLAR cells; CRYSTAL growth; THERMAL instability; CRYSTAL defects
- Publication
Advanced Functional Materials, 2021, Vol 31, Issue 7, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202007520