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Issue 48, 2019
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Oxygen heterocycle-fused indacenodithiophenebithiophene enables an efficient non-fullerene molecular acceptor

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Abstract

To improve the power conversion efficiency (PCE) of solar cells based on non-fullerene acceptors (NFAs), designing low bandgap NFAs of enhanced light-harvesting capability is desirable. Herein, a new set of NFAs based on an oxygen heterocycle-fused indacenodithiophenebithiophene core, were designed and synthesized, all of which achieved low bandgaps around 1.3 eV. An optimal power conversion efficiency of ∼8.4% was realized by systematic sidechain engineering. Detailed comparison based on the designed NFAs clarifies that the optimal molecule, IDTODT-3, contributes to a moderate phase separation with balanced charge transport and reduced recombination in the blend, and thus performs best. This work verifies the effectiveness of oxygen heterocycle-fusion on realizing LBG, which provides guidelines for designing efficient NFAs via molecule-engineering.

Graphical abstract: Oxygen heterocycle-fused indacenodithiophenebithiophene enables an efficient non-fullerene molecular acceptor

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Publication details

The article was received on 12 Sep 2019, accepted on 07 Nov 2019 and first published on 08 Nov 2019


Article type: Paper
DOI: 10.1039/C9TC05041H
J. Mater. Chem. C, 2019,7, 15344-15349

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    Oxygen heterocycle-fused indacenodithiophenebithiophene enables an efficient non-fullerene molecular acceptor

    C. Xia, H. Wu, Q. Yue, S. Chen, L. Shui, H. Fan and X. Zhu, J. Mater. Chem. C, 2019, 7, 15344
    DOI: 10.1039/C9TC05041H

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