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- Title
Rational Design of Additive with Suitable Functional Groups Toward High‐Quality FA<sub>0.75</sub>MA<sub>0.25</sub>SnI<sub>3</sub> Films and Solar Cells.
- Authors
Wang, Minghao; Li, Yawen; Zhao, Xiangqing; Wang, Wei; Chen, Junwen; Zhang, Wenzhu; Huang, Yue; Zhang, Lijun; Chen, Shufen
- Abstract
Stability and efficiency issues are closely related with poor perovskite film quality in perovskite solar cells (PSCs). Herein, 2‐aminophenol (C6H7NO) and 2‐amino‐4‐fluorophenol (C6H6FNO) are introduced to improve film quality of FA0.75MA0.25SnI3, both of which consist of —NH2 and —OH groups, and the latter also contains —F group. The experimental and theoretical analyses show both —NH2 and —OH groups interact with I of the SnI64− octahedron via hydrogen bond and fluorinated group with low surface energy causes spontaneous migration of C6H6FNO to solution–air surface and induces initial crystal nucleation and growth from surface, both of which contribute to improved film morphology and crystallinity and suppressed Sn2+ oxidation via reducing defect‐state density and nonradiative recombination. The F atom of C6H6FNO facing outward protects FA0.75MA0.25SnI3 from water penetration due to its hydrophobic feature. The C6H6FNO‐doped PSC acquires a champion efficiency of 9.50% and a long‐term stability of >800 h (80% efficiency remained in N2).
- Subjects
SOLAR cells; FUNCTIONAL groups; DISCONTINUOUS precipitation; SURFACE energy; CRYSTAL growth
- Publication
Solar RRL, 2022, Vol 6, Issue 1, p1
- ISSN
2367-198X
- Publication type
Article
- DOI
10.1002/solr.202100800