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Enhancing the performance of a fused-ring electron acceptor via extending benzene to naphthalene

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Abstract

We compared an indacenodithiophene(IDT)-based fused-ring electron acceptor IDIC1 with its counterpart IHIC1 in which the central benzene unit is replaced by a naphthalene unit, and investigated the effects of the benzene/naphthalene core on the optical and electronic properties as well as on the performance of organic solar cells (OSCs). Compared with benzene-cored IDIC1, naphthalene-cored IHIC1 shows a larger π-conjugation with stronger intermolecular π–π stacking. Relative to benzene-cored IDIC1, naphthalene-cored IHIC1 shows a higher lowest unoccupied molecular orbital energy level (IHIC1: −3.75 eV, IDIC1: −3.81 eV) and a higher electron mobility (IHIC1: 3.0 × 10−4 cm2 V−1 s−1, IDIC1: 1.5 × 10−4 cm2 V−1 s−1). When paired with the polymer donor FTAZ that has matched energy levels and a complementary absorption spectrum, IHIC1-based OSCs show higher values of open-circuit voltage, short-circuit current density, fill factor and power conversion efficiency relative to those of the IDIC1-based control devices. These results demonstrate that extending benzene in IDT to naphthalene is a promising approach to upshift energy levels, enhance electron mobility, and finally achieve higher efficiency in nonfullerene acceptor-based OSCs.

Graphical abstract: Enhancing the performance of a fused-ring electron acceptor via extending benzene to naphthalene

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Publication details

The article was received on 04 Oct 2017, accepted on 28 Nov 2017 and first published on 29 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04520D
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Enhancing the performance of a fused-ring electron acceptor via extending benzene to naphthalene

    J. Zhu, Y. Wu, J. Rech, J. Wang, K. Liu, T. Li, Y. Lin, W. Ma, W. You and X. Zhan, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C7TC04520D

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