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Overcoming Morphological and Efficiency Limit in All-Polymer Solar Cells by Designing Conjugated Random Copolymers Containing Naphtho[1,2-c:5,6-c’]bis([1,2,5]thiadiazole)] Moiety

Abstract

The ternary concept based on two electron donors and one electron acceptor is deployed to extend the absorption as well as photovoltaic performance of all-polymer solar cells (all-PSCs). However, it remains challenging to achieve delicate morphology of ternary blended bulk-heterojunction films through rational molecular design. To overcome these issues, here we designed and synthesized a series of narrow bandgap conjugated copolymers by combining two conjugated polymers with various molar ratios of naphthobis[1,2,5]thiadiazole (NT) unit (namely NT00-NT100). All-PSCs were constructed by integrating these resultant copolymers with a commercially available electron-accepting copolymer N2200. The resultant all-PSCs based on the ternary copolymers NT40 exihibited an impressively high power conversion efficiency over 8.0%, which obviously outperformed those of obtained from devices based on the NT00:NT100:N2200 blended films. Further characterization of the morphology of the films revealed that the incorporation of the NT unit can improve π-π stacking and a degree of phase separation conducive to exciton diffusion and charge transport.

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Publication details

The article was received on 27 Sep 2018, accepted on 06 Nov 2018 and first published on 06 Nov 2018


Article type: Communication
DOI: 10.1039/C8TA09356C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Overcoming Morphological and Efficiency Limit in All-Polymer Solar Cells by Designing Conjugated Random Copolymers Containing Naphtho[1,2-c:5,6-c’]bis([1,2,5]thiadiazole)] Moiety

    R. Xie, Z. Li, W. Zhong, L. Ying, Q. Hu, F. Liu, N. Li, T. P. Russell, F. Huang and Y. Cao, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA09356C

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