P3HT‐Based Polymer Solar Cells with 8.25% Efficiency Enabled by a Matched Molecular Acceptor and Smart Green‐Solvent Processing Technology
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- Xiaopeng Xu
- Key Laboratory of Green Chemistry and Technology of the Ministry of Education College of Chemistry, and State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610064 P. R. China
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- Guangjun Zhang
- Key Laboratory of Green Chemistry and Technology of the Ministry of Education College of Chemistry, and State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610064 P. R. China
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- Liyang Yu
- Key Laboratory of Green Chemistry and Technology of the Ministry of Education College of Chemistry, and State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610064 P. R. China
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- Ruipeng Li
- National Synchrotron Light Source II Brookhaven National Lab Suffolk Upton NY 11973 USA
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- Qiang Peng
- Key Laboratory of Green Chemistry and Technology of the Ministry of Education College of Chemistry, and State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610064 P. R. China
説明
<jats:title>Abstract</jats:title><jats:p>A novel molecular acceptor of TrBTIC (2,7,12‐tris((2‐(3‐oxo‐2,3‐dihydroinden‐1‐ylidene)malononitrile‐7‐benzothiadiazole‐2‐)truxene) is designed by attaching the 2‐(3‐oxo‐2,3‐dihydroinden‐1‐ylidene)malononitrile‐benzothiadiazole (BTIC) electron‐deficient unit to an electron‐rich truxene core. TrBTIC has excellent solubility in common solvents and features good energy level matching with poly(3‐hexylthiophene) (P3HT). Interestingly, P3HT can be readily dissolved in warm 1,2,4‐trimethylbenzene (TMB), a green solvent, but crystallizes slowly with long‐term aging in TMB at room temperature. A prephase separation can thus occur before active blend film deposition, and the separation degree can be easily controlled by varying the aging time. After 40 min of aging, the resulting active blend has the most appropriate phase separation with uniform nanowires, which forms favorable interpenetrating networks for exciton dissociation and charge transport. As a result, the device performance is improved from 6.62% to 8.25%. Excitingly, 8.25% is a new record for P3HT‐based solar cells. The study not only provides an efficient nonfullerene acceptor for matching P3HT donors but also develops a promising processing technology to realize high‐performance P3HT‐based polymer solar cells with an efficiency over 8%.</jats:p>
収録刊行物
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- Advanced Materials
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Advanced Materials 31 (52), 1906045-, 2019-11-14
Wiley