A Fluorination Strategy and Low-Acidity Anchoring Group in Self-Assembled Molecules for Efficient and Stable Inverted Perovskite Solar Cells
- Authors
- Sun, Xiaowen; Fan, Hua; Xu, Xiaowei; Li, Gongqiang; Gu, Xiaoyu; Luo, Dou; Shan, Chengwei; Yang, Qiong; Dong, Shixing; Miao, Chunyang; Xie, Zheng; Lu, Gang; Wang, Dong Hwan; Sun, Ping-Ping; Kyaw, Aung Ko Ko
- Issue Date
- Apr-2024
- Keywords
- Fluorination; Hole transport materials; Inverted planar perovskite solar cells; Self-assembled molecules
- Citation
- Chemistry (Weinheim an der Bergstrasse, Germany)
- Journal Title
- Chemistry (Weinheim an der Bergstrasse, Germany)
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/73470
- DOI
- 10.1002/chem.202400629
- ISSN
- 0947-6539
1521-3765
- Abstract
- Herein, we synthesized two donor-acceptor (D-A) type small organic molecules with self-assembly properties, namely MPA-BT-BA and MPA-2FBT-BA, both containing a low acidity anchoring group, benzoic acid. After systematically investigation, it is found that, with the fluorination, the MPA-2FBT-BA demonstrates a lower highest occupied molecular orbital (HOMO) energy level, higher hole mobility, higher hydrophobicity and stronger interaction with the perovskite layer than that of MPA-BT-BA. As a result, the device based-on MPA-2FBT-BA displays a better crystallization and morphology of perovskite layer with larger grain size and less non-radiative recombination. Consequently, the device using MPA-2FBT-BA as hole transport material achieved the power conversion efficiency (PCE) of 20.32% and remarkable stability. After being kept in an N2 glove box for 116 days, the unsealed PSCs' device retained 93% of its initial PCE. Even exposed to air with a relative humidity range of 30±5% for 43 days, its PCE remained above 91% of its initial condition. This study highlights the vital importance of the fluorination strategy combined with a low acidity anchoring group in SAMs, offering a pathway to achieve efficient and stable PSCs. © 2024 Wiley‐VCH GmbH.
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