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Conjugated polymer acceptors based on fused perylene bisimides with a twisted backbone for non-fullerene solar cells

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Abstract

In this work, we present a new strategy to use fused and twisted conjugated backbones to construct conjugated small molecules and polymers as electron acceptors for non-fullerene solar cells. The new conjugated materials containing binary perylene bisimide (PBI) units linked with coplanar thieno[3,2-b]thiophene (as trans-PBI) or twisted thieno[2,3-b]thiophene (as cis-PBI) and the corresponding conjugated polymer cis-polyPBI were developed. A fused conjugated backbone ensures good charge transport, in which the twisted polymer cis-polyPBI was found to show the highest electron mobility of 1.2 × 10−2 cm2 V−1 s−1 in field-effect transistors. Meanwhile, a twisted conjugated backbone effectively prevents the aggregation and crystallization of PBI units, resulting in isotropic charge transport and finely tuned micro-phase separation in bulk-heterojunction thin films. The high electron mobility and isotropic crystallinity make the fused and twisted electron acceptors achieve high power conversion efficiencies above 6% in non-fullerene solar cells, while the coplanar molecule trans-PBI as the electron acceptor shows a very low efficiency of 0.13%.

Graphical abstract: Conjugated polymer acceptors based on fused perylene bisimides with a twisted backbone for non-fullerene solar cells

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Publication details

The article was received on 15 Mar 2017, accepted on 27 Apr 2017 and first published on 28 Apr 2017


Article type: Paper
DOI: 10.1039/C7PY00444C
Citation: Polym. Chem., 2017, Advance Article
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    Conjugated polymer acceptors based on fused perylene bisimides with a twisted backbone for non-fullerene solar cells

    X. Jiang, Y. Xu, X. Wang, F. Yang, A. Zhang, C. Li, W. Ma and W. Li, Polym. Chem., 2017, Advance Article , DOI: 10.1039/C7PY00444C

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