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Highly efficient and highly stable terpolymer-based all-polymer solar cells with broad complementary absorption and robust morphology

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Abstract

A novel conjugated terpolymer referred to as Ter-3MTTPD was successfully synthesized using 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene as a donor and methyl thiophene-3-carboxylate (3MT) and 5-(2-ethylhexyl)-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione (TPD) as acceptor units to investigate the effects of the terpolymer structure on the optical and electrochemical properties. The performance of an all-polymer solar cell (all-PSC) was comprehensively examined by blending the terpolymer with 2,7-bis(2-hexyldecyl)-4-(selenophen-2-yl)benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetraone (NDI-Se). The as-cast blend film of Ter-3MTTPD:NDI-Se exhibits the highest power conversion efficiency of 7.66% in the all-PSC. This was further supported by the results of time-resolved photoluminescence (TRPL) in Ter-3MTTPD:NDI-Se blend film states which yielded the highest PL quenching efficiency (90%) resulting from the shortest average lifetime, τave of ∼67 ps, much smaller than those of the two binary copolymer blend films (e.g., τave = 194 ps and 149 ps, respectively, for Co-3MT:NDI-Se and Co-TPD:NDI-Se). In addition, for an as-cast blend film of Ter-3MTTPD:NDI-Se in the active layer, the shelf-life (∼1000 h) of the all-PSC under ambient conditions was found to be much better compared to those of PSCs based on the other two binary copolymers, Co-3MT and Co-TPD.

Graphical abstract: Highly efficient and highly stable terpolymer-based all-polymer solar cells with broad complementary absorption and robust morphology

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Publication details

The article was received on 22 Feb 2018, accepted on 26 Apr 2018 and first published on 27 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01765D
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Highly efficient and highly stable terpolymer-based all-polymer solar cells with broad complementary absorption and robust morphology

    A. Kim, C. G. Park, S. H. Park, H. J. Kim, S. Choi, Y. U. Kim, C. H. Jeong, W. Chae, M. J. Cho and D. H. Choi, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA01765D

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