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Issue 45, 2019
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Simultaneous improvement of three parameters using a binary processing solvent system approach in as-cast non-fullerene solar cells

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Abstract

As-cast polymer solar cells without any additive and pre- or post-treatments principally have high compatibility with mass production technologies, and efforts in achieving higher efficiencies are typically promoted by engineering new donor and acceptor materials. In this study, a binary solvent processing approach using chloroform (CF), as a good low boiling point solvent for both the donor polymer PTQ10 and the non-fullerene acceptor IT-4Cl, and mesitylene (MES), as a semi-orthogonal co-solvent with relatively high boiling point and weak solubility to the acceptor, is explored. Due to the selective orthogonality of MES to the IT-4Cl acceptor, an optimized morphology has been realized for the as-cast device based on the PTQ10:IT-4Cl blend, which leads to a simultaneous improvement in the open-circuit voltage, short-circuit current, and fill factor, finally achieving a high as-cast efficiency of over 13%. Furthermore, the as-cast devices fabricated with this binary solvent system exhibit good air stability and great accessibility in large area cells. Our findings provide an alternative guideline for the optimization of as-cast polymer solar cells.

Graphical abstract: Simultaneous improvement of three parameters using a binary processing solvent system approach in as-cast non-fullerene solar cells

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Publication details

The article was received on 02 Oct 2019, accepted on 23 Oct 2019 and first published on 23 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA10887D
J. Mater. Chem. A, 2019,7, 25978-25984

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    Simultaneous improvement of three parameters using a binary processing solvent system approach in as-cast non-fullerene solar cells

    G. Qin, L. Zhang, D. Yuan, H. Jiang, W. Tang, M. Chen, W. Wu, Y. Cao and J. Chen, J. Mater. Chem. A, 2019, 7, 25978
    DOI: 10.1039/C9TA10887D

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