Correlation of Dimer-Linker-Induced Conformational Lock with Nonradiative Energy Loss in Organic Solar Cells
The efficiencies of dimer-based devices still lag those of their small molecule-based counterparts. This is primarily due to the considerable dihedrals in the dimer skeleton, which compromises the molecular packing, thus influencing the charge generation and nonradiative voltage loss (ΔVoc,nr). Herein, we developed two dimeric acceptors with varied π-linkers to investigate the influence of linker-induced conformational lock on ΔVoc,nr. We find that the helically lapped O-shaped dimer delivers better intermolecular packing than the planar S-shaped one that incorporates a bulkier π-linker. However, its planar skeleton is instead more favorable for forming a compact and ordered stacking with the host acceptor in ternary blend. This possibly promotes exciton dissociation, thus reducing the nonradiative decay of excited states. Moreover, its longer exciton lifetime could offer additional charge-transfer channels. These contributions effectively minimize ΔVoc,nr to 0.195 eV, while delivering a high efficiency approaching 20% in the derived ternary device.
Authors
- Francis Lin (ORCID: https://orcid.org/0000-0002-4651-9145)
- Wenlin Jiang (ORCID: https://orcid.org/0000-0003-2387-1901)
- Tianqi Chen (ORCID: https://orcid.org/0000-0003-3839-3164)
- Ruipeng Li (ORCID: https://orcid.org/0000-0001-8176-3138)
- Alex K.‐Y. Jen (ORCID: https://orcid.org/0000-0002-9219-7749)
- Jie Zeng (ORCID: https://orcid.org/0000-0003-0159-8051)
- Hongxiang Li (ORCID: https://orcid.org/0009-0002-3951-1484)
- Huanhuan Gao (ORCID: https://orcid.org/0009-0003-6946-6765)
- Baobing Fan (ORCID: https://orcid.org/0000-0001-6514-7490)
- Liyang Yu (ORCID: https://orcid.org/0000-0002-1203-2996)
- Yiwen Wang (ORCID: https://orcid.org/0000-0001-9653-7643)
- Lei Wang (ORCID: https://orcid.org/0000-0002-8670-9410)
- Bin Kan (ORCID: https://orcid.org/0000-0003-2305-3482)
Institutions
- Jinan University (CN)
- City University of Hong Kong (HK)
- Xi'an Shiyou University (CN)
- Brookhaven National Laboratory (US)
- Nankai University (CN)
- National Institute for Materials Science (JP)
- Sichuan University (CN)
- Beijing Institute of Optoelectronic Technology (CN)
- Ingenierie des Materiaux polymeres (FR)
- Stanford Synchrotron Radiation Lightsource (US)
- Division of Materials Science and Engineering (AU)
Publication Details
- Journal
- ACS Energy Letters
- Published
- 2024-10-25
- DOI
- https://doi.org/10.1021/acsenergylett.4c02429
- Citations
- 22
- Primary Topic
- Organic Electronics and Photovoltaics
- Type
- article
- Field-Weighted Citation Impact
- 4.59
Funders
- City University of Hong Kong
- Research Grants Council, University Grants Committee
- Innovation and Technology Commission
- Ministry of Human Resources and Social Security
- Basic and Applied Basic Research Foundation of Guangdong Province