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Issue 3, 2019
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Synergistic effect of side-chain and backbone engineering in thieno[2,3-f]benzofuran-based conjugated polymers for high performance non-fullerene organic solar cells

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Abstract

Most polymer donors developed so far for high-performance polymer solar cells (PSCs) are designed in planar molecular geometries containing benzodithiophene (BDT) units. In this study, three two-dimensional conjugated polymers, PTBFEH-BDD, PTBFSDO-BDD and PTBFSEH-BDD, based on thieno[2,3-f]benzofuran (TBF) building blocks with different side-chains are designed and synthesized. It is found that the TBF unit can inherit and integrate the advantages of both the BDT and benzo[1,2-b:4,5-b′]difuran (BDF) building blocks. Due to the synergistic effects of oxygen and sulfur in the backbone and the optimized side chain, PTBFEH-BDD shows a higher absorption coefficient, more suitable aggregation and improved hole mobility in comparison with PTBFSDO-BDD and PTBFSEH-BDD, which improves the JSC and FF in PSCs. The PSCs based on PTBFEH-BDD:ITIC achieve a power conversion efficiency (PCE) of 11.13% with a JSC of 17.76 mA cm−2, a VOC of 0.893 V, and a FF of 70.16%, which is comparable with its BDT counterparts. Moreover, the PSCs based on these three TBF-based devices do not need any extra post treatments or additives. This study demonstrates that the TBF-based polymers are promising candidates for highly efficient non-fullerene PSCs.

Graphical abstract: Synergistic effect of side-chain and backbone engineering in thieno[2,3-f]benzofuran-based conjugated polymers for high performance non-fullerene organic solar cells

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Publication details

The article was received on 03 Aug 2018, accepted on 05 Dec 2018 and first published on 06 Dec 2018


Article type: Communication
DOI: 10.1039/C8TA07544A
Citation: J. Mater. Chem. A, 2019,7, 958-964

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    Synergistic effect of side-chain and backbone engineering in thieno[2,3-f]benzofuran-based conjugated polymers for high performance non-fullerene organic solar cells

    K. Dou, X. Wang, Z. Du, H. Jiang, F. Li, M. Sun and R. Yang, J. Mater. Chem. A, 2019, 7, 958
    DOI: 10.1039/C8TA07544A

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