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Issue 8, 2019
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A decacyclic indacenodithiophene-based non-fullerene electron acceptor with meta-alkyl-phenyl substitutions for polymer solar cells

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Abstract

Indacenodithiophene (IDT) is a promising building block for designing organic semiconductors. In this work, a new decacyclic building block (m-IDTIDT) with a double IDT unit and meta-alkyl-phenyl substitutions was synthesized and used for designing a new non-fullerene electron acceptor (m-IDTIDT-FIC). Compared to p-IDTIDT-IC, m-IDTIDT-FIC has a smaller π–π distance, larger crystalline coherence length, and higher electron mobility. Thus, polymer solar cells (PSCs) based on PCE10:m-IDTIDT-FIC can achieve a higher PCE (8.27%) than PCE10:p-IDTIDT-IC-based PSCs (6.48%). In addition, PSCs based on J71:m-IDTIDT-FIC show better photovoltaic performances than PSCs based on PCE10:m-IDTIDT-FIC. This is because the J71:m-IDTIDT-FIC blend film has more balanced charge transport ability, a smooth surface, and higher relative domain purity than the PCE10:m-IDTIDT-FIC blend film. PSCs based on J71:m-IDTIDT-FIC exhibited the best photovoltaic performances with a PCE of 11.32%, an open-circuit voltage (Voc) of 0.92 V, a short-circuit current (Jsc) of 18.01 mA cm−2, and a fill factor (FF) of 68.30%. These results indicate that m-IDTIDT with meta-alkyl-phenyl substitutions is a promising IDT-based building block for high-performance non-fullerene electron acceptors.

Graphical abstract: A decacyclic indacenodithiophene-based non-fullerene electron acceptor with meta-alkyl-phenyl substitutions for polymer solar cells

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Publication details

The article was received on 12 Dec 2018, accepted on 19 Jan 2019 and first published on 21 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA11972D
J. Mater. Chem. A, 2019,7, 4063-4071

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    A decacyclic indacenodithiophene-based non-fullerene electron acceptor with meta-alkyl-phenyl substitutions for polymer solar cells

    F. Wu, L. Zhong, H. Hu, Y. Li, Z. Zhang, Y. Li, Z. Zhang, H. Ade, Z. Jiang and L. Liao, J. Mater. Chem. A, 2019, 7, 4063
    DOI: 10.1039/C8TA11972D

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