期刊
CHEMICAL ENGINEERING JOURNAL
卷 440, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135975
关键词
Polymer solar cell; Solid additive; Y6 derivative; Isomer; Vitrification agent
资金
- National Natural Science Foundation of China (NSFC) [21825502, 22075190, 21905185, 22105135]
- Special funds for local science and technology development guided by the central government [2020ZYD004]
- Foundation of State Key Laboratory of Polymer Materials Engineering [SKLPME 2017-2-04]
- Fundamental Research Funds for the Central Universities
- National Synchrotron Light Source II (NSLS-II) Brookhaven National Laboratory [DE-SC0012704]
The current top-performing polymer solar cell systems are mainly based on PM6:Y6 host blend. This study explores the use of an isomerization strategy to design a suitable vitrification agent, i-Y6, for the non-fullerene electron acceptor Y6. The addition of i-Y6 at low dosages allows for fine-tuning of the blend morphology and improves the performance of the PSCs.
The current top-performing polymer solar cell (PSC) systems are mostly based on PM6:Y6 host blend. To date, numerous materials have been explored as the third component for these systems to form ternary blends or as additives. Vitrification agents are a group of additives proved to be useful in affecting the morphology of organic semiconductors. To design a suitable vitrification agent for non-fullerene electron acceptor Y6, an isomer strategy was explored where the thienothiophene wings of the Y6 molecule were inversed to form a W-shaped Y6 isomer of i-Y6. It was found that i-Y6 crystallized poorly with a different packing style than Y6 and could blend well in amorphous phase of Y6. These properties enabled i-Y6 to finely tune the morphology of PM6:Y6 blend at low additive dosages. The power conversion efficiency (PCE) of PM6:Y6 based PSC was raised from 16.827% to 17.433% at a dosage of Y6:i-Y6 ratio of 24:1. This work demonstrated isomerization as a viable strategy for developing solid additives for high performance PSC blends and vitrification agents as effective additives for tuning morphology and improving performances of PSCs.
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