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Cyclometalated Pt Complex based Random Terpolymers for Efficient Polymer Solar Cells

Abstract

Various low ratio of platinum complexes (0, 1, 1.5 and 5 mol%) are introduced as the third monomer to the conjugated backbone of famous donor polymer PTB7-Th through random terpolymer approach. All the polymers show similar absorption behavior and comparably HOMO/LUMO energy levels due to the very small amount of Pt complex. When blended with PC71BM in polymer solar cells, enhanced power conversion efficiency to 8.45% is obtained in 1.5 mol% Pt containing PTB7-ThPt1.5 based device compared to 7.92% of the control PTB7-Th. It should be noted that the apparently lower molecular weight of PTB7-ThPt1.5 (Mn/Mw: 46/70 kg/mol) than PTB7-Th (Mn/Mw: 62/97 kg/mol) ensures a more convincing comparasion. Through a combination of physical measurement, such as optoelectrical characterization, grazing incident wide-angle X-ray diffraction (GIWAXS) and pico-second time-resolved photoluminescence, the efficiency enhancement are contributed from comprehensive factors of higher hole mobility, less bimolecular recombination and more efficient slow process of charge separation.

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Publication details

The article was received on 03 Jun 2017, accepted on 11 Jul 2017 and first published on 11 Jul 2017


Article type: Paper
DOI: 10.1039/C7PY00924K
Citation: Polym. Chem., 2017, Accepted Manuscript
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    Cyclometalated Pt Complex based Random Terpolymers for Efficient Polymer Solar Cells

    Y. Tao, Z. Wan, J. Yang, Y. Liu, S. Wang, Y. Zhong, C. Li, Z. Zhang, G. Xing, S. Hüttner, Y. Li and W. Huang, Polym. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7PY00924K

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