Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 16, Pages 5890-5897Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00612d
Keywords
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Funding
- National Natural Science Foundation of China [21504062, 21202114, 21204054, 51303118, 91333204]
- Natural Science Foundation of Jiangsu Province [BK20130289]
- China Postdoctoral Science Foundation Funded Project [2015M581853]
- Jiangsu Province Postdoctoral Science Foundation Funded Project [1501024B]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Programs Foundation of the Ministry of Education of China [20133201120008]
- Beijing National Laboratory for Molecular Sciences [20140112]
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials
- CSC
- Open Research Fund of State Key Lab of Silicon Materials (Zhejiang University)
- Knut and Alice Wallenberg foundation
- Science Council, Sweden
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A non-fullerene electron acceptor bearing a fused 10-heterocyclic ring (indacenodithiophenoindacenodithiophene) with a narrow band gap (similar to 1.5 eV) was designed and synthesized. It possesses excellent planarity and enhanced effective conjugation length compared to previously reported fused-ring electron acceptors. When this acceptor was paired with PTB7-Th and applied in polymer solar cells, a power conversion efficiency of 6.5% was achieved with a high open circuit voltage of 0.94 V. More significantly, an energy loss as low as 0.59 eV and an external quantum efficiency as high as 63% were obtained simultaneously.
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