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Issue 46, 2018
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Overcoming the morphological and efficiency limit in all-polymer solar cells by designing conjugated random copolymers containing a naphtho[1,2-c:5,6-c′]bis([1,2,5]thiadiazole)] moiety

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Abstract

The ternary concept based on two electron donors and one electron acceptor has been deployed to extend the absorption as well as photovoltaic performance of all-polymer solar cells (all-PSCs). However, it is still challenging to achieve the delicate morphology of ternary blended bulk-heterojunction films through rational molecular design. To overcome these issues, herein, we designed and synthesized a series of narrow bandgap conjugated copolymers by combining two conjugated polymers with various molar ratios of the 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 exhibited an impressively high power conversion efficiency over 8.0%, which was clearly superior to that obtained for 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 improved π–π stacking and a degree of phase separation, which are conducive to exciton diffusion and charge transport.

Graphical abstract: Overcoming the morphological and efficiency limit in all-polymer solar cells by designing conjugated random copolymers containing a naphtho[1,2-c:5,6-c′]bis([1,2,5]thiadiazole)] moiety

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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, 2018,6, 23295-23300
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    Overcoming the morphological and efficiency limit in all-polymer solar cells by designing conjugated random copolymers containing a 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, 6, 23295
    DOI: 10.1039/C8TA09356C

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