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New Indolo Carbazole Based Non-Fullerene n-Type Semiconductors for Organic Solar cell Applications

Abstract

In this work indolo-[3,2-b]-carbazole (ICz) core based two new non-fullerene acceptors (ICz-Rd2 and ICz-RdCN2) with A-π-D-π-A backbone are designed, synthesized and characterized and the influence of molecular engineering on terminal end groups on their performance in organic solar cells (OSCs) were systematically examined. ICz-Rd2 and ICz-RdCN2 acceptors show strong and wide ranging absorption profile from 350-800 nm in solution and film with a high molar extinction coefficient of 6.6×104 M-1cm-1 and 1.0×105 M-1cm-1, respectively. These acceptors were employed along with a low bandgap D-A conjugated polymer P as donor for the polymer solar cells and aftet the optimization of active layers, P:ICz-Rd2 and P:ICz-RdCN2 based devices offered overall power conversion efficiency of 7.88% and 9.76%, which are higher than that of PC71BM processed counterpart (5.89%). The enhanced power conversion efficiency for non-fullerene acceptor may be related to the wide absorption spectra of the active layers and low voltage loss.

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Publication details

The article was received on 22 Oct 2018, accepted on 27 Nov 2018 and first published on 30 Nov 2018


Article type: Paper
DOI: 10.1039/C8TC05318A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    New Indolo Carbazole Based Non-Fullerene n-Type Semiconductors for Organic Solar cell Applications

    S. Suman, A. Siddiqui, M. L. Keshtov, G. D. Sharma and S. P. Singh , J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC05318A

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