期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 15, 期 12, 页码 5137-5148出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ee02553a
关键词
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资金
- National Natural Science Foundation of China [21805097, 52003093]
- Guangdong Natural Science Foundation [2021B1515120073]
- National Key R&D Program for International Collaboration [2021YFE0191500]
- Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology [HT-CSNS-DG-CD-0088/2021]
- Open Fund of Energy and Materials Chemistry Joint Laboratory of SCNU and TINCI [SCNU-TINCI-2022]
- Opening Project of Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Scientific and Technological Plan of Guangdong Province, China [2019B090905005]
Incorporating thiophene derivatives as solvent additives in organic solar cells can improve efficiency and fill factor. The FBrT solvent additive prolongs the crystallization and phase separation process of photovoltaic materials by dissolving donors and acceptors. The FBrT-treated solar cells exhibit improved exciton dissociation, charge transportation, extraction, and carrier recombination suppression.
Incorporating solvent additives in donor and acceptor solutions is an effective strategy for achieving efficient organic solar cells. As the state-of-the-art photovoltaic materials have thiophene sequences along their conjugated backbones, in this contribution, thiophene analogues 2,5-dibromothiophene (HBrT) and 2,5-dibromo-3,4-difluoro-thiophene (FBrT) have been developed as solvent additives. Results show that FBrT has a high boiling point and the ability to dissolve donors and acceptors readily due to the like dissolve like principle, providing an effective tool in prolonging the crystallization and phase separation kinetic process of photovoltaic materials. Due to the concurrent formation of increased crystallinity, favorable phase separation, and P-i-N-like heterojunction, the FBrT-treated solar cells demonstrated improved exciton dissociation, charge transportation, extraction, and suppressed carrier recombination. Therefore, the PM6:Y6-based solar cells with FBrT additive reached an efficiency of 17.9% and fill factor of 78.6%, which are one of the highest values reached for the PM6:Y6-based binary solar cells. More strikingly, the FBrT solvent additive possesses general applicability in L8-BO, Y6-BO, and BTP-eC9-based solar cells and achieves significantly enhanced efficiencies of 18.6 similar to 18.7% in devices. These findings make it clear that the thiophene derivatives are effective solvent additives for the further optimization of organic solar cells.
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