19.35% Efficient Binary Bulk‐Heterojunction Organic Photovoltaic Enabled by Optimizing Bromine‐Substituted Self‐Assembled Carbazole Based Molecules
Abstract A bromine‐substituted [2‐(9H‐Carbazol‐9‐yl) ethyl] phosphonic acid, 1Br‐2PACz, is designed as hole‐selective self‐assembled monolayers (SAMs), contributing to an outstanding power conversion efficiency (PCE) of 19.35% for binary bulk‐heterojunction (BHJ) based organic solar cells (OSCs). As compared to the previous high‐performance 2Br‐2PACz SAMs, 1Br‐2PACz molecules can effectively reduce the interaction of the SAM with the BTP‐eC9 nonfullerene acceptors with a decreased binding energy, resulting in the suppressed vertical self‐aggregation of BTP‐eC9 small molecules as the bottom side of PM6:BTP‐eC9 BHJ during the solidification process. There is decreased energetic disorder within photoactive layer together with more efficient charge transfer and suppressed non‐radiative recombination. Furthermore, five additional binary BHJ systems are applied in 1Br‐2PACz SAM‐based OSCs, exhibiting continuously superior performance as compared to the reference cells with conventional PEDOT:PSS hole transport layer. This work underscores the potential of advancing OSCs by fine‐tuning SAMs through halogenation strategies to improve active layer morphology and overall device performance.
Authors
- Xiaoping Ouyang (ORCID: https://orcid.org/0000-0001-8474-2869)
- Manjia Lu
- Guangye Zhang (ORCID: https://orcid.org/0000-0002-2750-7720)
- Iain McCulloch (ORCID: https://orcid.org/0000-0002-6340-7217)
- Yiguo Yao
- Xiaoman Ding
- Chunming Yang (ORCID: https://orcid.org/0000-0001-8008-3675)
- Yumeng Shi (ORCID: https://orcid.org/0000-0002-9623-3778)
- Chenyang Zhang (ORCID: https://orcid.org/0000-0002-8351-7659)
- Haoran Lin (ORCID: https://orcid.org/0000-0003-0625-8881)
- Hanlin Hu (ORCID: https://orcid.org/0000-0001-5617-0998)
- Yuanbao Lin (ORCID: https://orcid.org/0000-0001-7601-1433)
- Kai Wang (ORCID: https://orcid.org/0000-0003-1012-1781)
- Jie Lv (ORCID: https://orcid.org/0000-0002-8095-5880)
- Xiaokang Sun (ORCID: https://orcid.org/0000-0003-0402-7342)
- Jie Yao
- Liangxiang Zhu
Institutions
- Qingdao University (CN)
- Northwestern Polytechnical University (CN)
- Shenzhen University (CN)
- Shenzhen Polytechnic University (CN)
- Chinese Academy of Sciences (CN)
- Hong Kong University of Science and Technology (HK)
- Princeton University (US)
- University of Oxford (GB)
- Shanghai Advanced Research Institute (CN)
- Shenzhen Institutes of Advanced Technology (CN)
- Shenzhen Technology University (CN)
- University of Chinese Academy of Sciences (CN)
- Xiangtan University (CN)
- University of Hong Kong (HK)
Publication Details
- Journal
- Advanced Functional Materials
- Published
- 2024-08-29
- DOI
- https://doi.org/10.1002/adfm.202406060
- Citations
- 17
- Primary Topic
- Organic Electronics and Photovoltaics
- Type
- article
- Field-Weighted Citation Impact
- 3.55
Funders
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Shenzhen Science and Technology Innovation Program
- Basic and Applied Basic Research Foundation of Guangdong Province