Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003141
Keywords
asymmetric alkoxy substitution; morphology; organic solar cells; solubility; Y‐ series acceptors
Categories
Funding
- National Key Research and Development Program of China - MOST [2019YFA0705900]
- Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- Shen Zhen Technology and Innovation Commission [JCYJ20170413173814007, JCYJ20170818113905024]
- Hong Kong Research Grants Council [R6021-18, C6023-19G, 16309218, 16310019, 16303917]
- Hong Kong Innovation and Technology Commission [ITC-CNERC14SC01, ITS/471/18]
- National Natural Science Foundation of China (NSFC) [91433202]
- ONR [N000141712204]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Natural Science Foundation of China [21734009, 11327902, 11574204, 11774224, 21822505]
- National Key Research and Development Program of China [2017YFA0207700]
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The paper presents a strategy of asymmetric alkyl and alkoxy substitution on Y-series nonfullerene acceptors, achieving great performance in organic solar cell devices. Asymmetric substitution on Y6 results in a molecule that maintains V-oc improvement and good solubility, enabling highly efficient nonfullerene OSCs. This asymmetric side-chain strategy shows potential for improving the performance of other NFA-material systems.
In this paper, a strategy of asymmetric alkyl and alkoxy substitution is applied to state-of-the-art Y-series nonfullerene acceptors (NFAs), and it achieves great performance in organic solar cell (OSC) devices. Since alkoxy groups can have a significant influence on the material properties of NFAs, alkoxy substitution is applied to the Y6 molecule in a symmetric manner. The resulting molecule (named Y6-2O), despite showing improved open-circuit voltage (V-oc), yields extremely poor performance due to low solubility and excessive aggregation properties, a change that is due to the conformational locking effect of alkoxy groups. In contrast, asymmetric alkyl and alkoxy substitution on Y6, yields a molecule named Y6-1O that can maintain the positive effect of V-oc improvement and obtain reasonably good solubility. The resulting molecule Y6-1O enables highly efficient nonfullerene OSCs with 17.6% efficiency and the asymmetric side-chain strategy has the potential to be applied to other NFA-material systems to further improve their performance.
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