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Issue 34, 2018
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Enhancing the performance of non-fullerene organic solar cells via end group engineering of fused-ring electron acceptors

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Abstract

A fused heptacyclic electron acceptor, ITIC5, based on a benzodi(cyclopentadithiophene) core flanked by thiophene-fused termini, is designed, synthesized, and compared with its benzene-fused analogue, ITIC1. ITIC5 with thiophene-fused termini exhibits a narrower optical band gap, stronger and redshifted absorption, and higher electron mobility than ITIC1. The active layer consisting of a wide-bandgap polymer donor J71 and ITIC5 exhibits a smaller acceptor domain, stronger crystallinity, and higher and more balanced mobilities than its J71:ITIC1 counterpart, contributing to efficient exciton dissociation and charge transport. J71:ITIC5 based organic solar cells exhibit a high fill factor of 75.5% and a champion power conversion efficiency of 12.5%, a nearly 40% boost in efficiency with respect to the ITIC1-based control device, suggesting that the thiophene-fused end group has great potential for constructing high-performance fused-ring electron acceptors.

Graphical abstract: Enhancing the performance of non-fullerene organic solar cells via end group engineering of fused-ring electron acceptors

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Publication details

The article was received on 18 Jun 2018, accepted on 27 Jul 2018 and first published on 31 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA05800H
Citation: J. Mater. Chem. A, 2018,6, 16638-16644
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    Enhancing the performance of non-fullerene organic solar cells via end group engineering of fused-ring electron acceptors

    C. Yan, W. Wang, T. Lau, K. Li, J. Wang, K. Liu, X. Lu and X. Zhan, J. Mater. Chem. A, 2018, 6, 16638
    DOI: 10.1039/C8TA05800H

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