期刊
CHEMISTRY OF MATERIALS
卷 31, 期 17, 页码 6672-6676出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b00980
关键词
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资金
- National Basic Research Program of China [2013CB834701, 2014CB643501]
- Hong Kong Research Grants Council [T23-407/13 N, N_HKUST623/13, 16305915, 16322416, 606012]
- HK JEBN Limited
- HKUST president's office [FP201]
- National Science Foundation of China [21374090]
- ONR [N000141512322]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-ACO2-05CH11231]
End group engineering is critical for developing A-D-A-type non-fullerene acceptors with suitable absorption properties and high crystallinity for organic solar cells. Here, we report the synthesis of a novel chlorinated thiophene end group and its application in A-D-A-type acceptors. When combined with a tetraoctyl-substituted indacenodithieno-[3,2-b]thiophene core, the resulting C8-ITCC-Cl acceptor exhibited red-shifted absorption and downshifted energy levels relative to those of the nonchlorinated analogue, C8-ITCC, due to the strong electron-withdrawing ability of the chlorine atoms as revealed by theoretical calculations. Moreover, the noncovalent interactions induced by the chlorine atoms enabled improved lamellar and pi-pi stacking of C8-ITCC-Cl, leading to a higher electron mobility of 6.6 x 10(-4) cm(2) V-1 s(-1) and a fill factor of 73% of the PBDB-TF:C8-ITCC-Cl devices. Consequently, a high power conversion efficiency of 12.7% was achieved by the C8-ITCC-Cl-based devices, which outperformed the C8-ITCC-based ones (10.8%). This work highlights the potentials of halogenated thiophene end groups for highly crystalline A-D-A-type non-fullerene acceptors.
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