Configurational Isomerization‐Induced Orientation Switching: Non‐Fused Ring Dipodal Phosphonic Acids as Hole‐Extraction Layers for Efficient Organic Solar Cells
Phosphonic acid (PA) self-assembled molecules have recently emerged as efficient hole-extraction layers (HELs) for organic solar cells (OSCs). However, the structural effects of PAs on their self-assembly behaviors on indium tin oxide (ITO) and thus photovoltaic performance remain obscure. Herein, we present a novel class of PAs, namely "non-fused ring dipodal phosphonic acids" (NFR-DPAs), featuring simple and malleable non-fused ring backbones and dipodal phosphonic acid anchoring groups. The efficacy of configurational isomerism in modulating the photoelectronic properties and switching molecular orientation of PAs atop electrodes results in distinct substrate surface energy and electronic characteristics. The NFR-DPA with linear (C<sub>2h</sub> symmetry) and brominated backbone exhibits favorable face-on orientation and enhanced work function modification capability compared to its angular (C<sub>2v</sub> symmetry) and non-brominated counterparts. This makes it versatile HELs in mitigating interfacial resistance for energy barrier-free hole collection, and affording optimal active layer morphology, which results in an impressive efficiency of 19.11 % with a low voltage loss of 0.52 V for binary OSC devices and an excellent efficiency of 19.66 % for ternary OSC devices. This study presents a new dimension to design PA-based HELs for high-performance OSCs.
Authors
- Yuxin Duan
- Wenxu Liu (ORCID: https://orcid.org/0000-0002-1647-9162)
- Young Mee Jung (ORCID: https://orcid.org/0000-0003-4362-0990)
- Yeonju Park (ORCID: https://orcid.org/0000-0001-8310-3651)
- Yao Liu (ORCID: https://orcid.org/0000-0001-6022-6106)
- Zaifei Ma (ORCID: https://orcid.org/0000-0002-3100-1570)
- Yifan Huang (ORCID: https://orcid.org/0000-0002-0615-0814)
- Jiaxin Gao (ORCID: https://orcid.org/0009-0000-5151-1546)
- Sang Wan Cho (ORCID: https://orcid.org/0000-0001-7258-8059)
- Hyunbok Lee (ORCID: https://orcid.org/0000-0002-3046-1524)
- Yuxing Wang (ORCID: https://orcid.org/0000-0003-4510-2783)
- Lei Zhang (ORCID: https://orcid.org/0000-0001-6873-7314)
- Soohyung Park (ORCID: https://orcid.org/0000-0002-6589-7045)
- Junjie Wen (ORCID: https://orcid.org/0009-0003-5965-7226)
- Miao Liu (ORCID: https://orcid.org/0000-0003-3223-6010)
- Woojin Shin (ORCID: https://orcid.org/0009-0007-9116-2687)
Institutions
- Korea Advanced Institute of Science and Technology (KR)
- Kangwon National University (KR)
- Donghua University (CN)
- Yonsei University (KR)
- Chinese Academy of Sciences (CN)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- Division of Materials Science and Engineering (AU)
- Advanced Analysis Center (JP)
- Institute of Physics (CN)
- University of Chinese Academy of Sciences (CN)
- Korea Institute of Science and Technology (KR)
- Beijing University of Chemical Technology (CN)
- Korea University of Science and Technology (KR)
Publication Details
- Journal
- Angewandte Chemie International Edition
- Published
- 2024-08-30
- DOI
- https://doi.org/10.1002/anie.202408960
- Citations
- 18
- Primary Topic
- Organic Electronics and Photovoltaics
- Type
- article
- Field-Weighted Citation Impact
- 3.76
Funders
- U.S. Department of Energy
- National Natural Science Foundation of China
- Kangwon National University
- Korea Basic Science Institute
- Office of Science
- Fundamental Research Funds for the Central Universities
- Basic Energy Sciences
- SLAC National Accelerator Laboratory