Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 13, Issue 9, Pages 2864-2869Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ee01763a
Keywords
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Funding
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- National Natural Science Foundation of China [21835006, 91633301, 51673201, 21704004]
- Fundamental Research Funds for the Central Universities, China [FRF-TP-19-047A2]
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXXM-201903]
- Peiyang Scholar Program of Tianjin University
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2020-skllmd-11]
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The advantage of low cost makesP3HTone of the most attractive electron donors for photovoltaic applications, but the power conversion efficiency (PCE) of theP3HT-based organic solar cells (OSCs) remains low (7-8%). Herein, to modulate the phase separation morphology so as to enhance the PCE inP3HT-based OSCs, a new NFA, namelyZY-4Cl, is designed and synthesized by modifying the cyano-substituted end groups inBTP-4Cl. TheP3HT:ZY-4Clbased OSC exhibits a significantly improved PCE of similar to 9.5%, which is a new record for theP3HT-based OSCs. Furthermore, two model compounds,TT-CNandTT-O, are synthesized to simulate the end groups ofBTP-4ClandZY-4Cl, respectively. The calculated Flory-Huggins interaction parameter, the DSC and the AFM results clearly indicate that the cyano-substituted compoundTT-CNshows much stronger miscibility withP3HTcompared toTT-O, the one without cyano groups. This molecular design strategy is also verified in the other two representative NFAs. Therefore, this work not only reports an NFA with a high PCE forP3HT-based OSCs, but also suggests guidance for the molecular design of NFAs from the aspect of morphology control.
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