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Influence of the π-Bridging Unit of Fused-Ring Acceptor on the Performance of Organic Solar Cells

Abstract

We have designed and synthesized two fused-ring small molecular acceptors IDT-PDOT and IDT-EDOT, comprising 3,4-propylenedioxythiophene (PDOT) and 3,4-ethylenedioxythiophene (EDOT) bridging unit, respectively. The only structural difference of these two acceptors is one methylene group at the π-bridging unit. However, such a tiny structural difference exhibits a great influence on the optical, electrical and photovoltaic properties of acceptors. The molar absorption coefficient of IDT-EDOT is more than four times higher than that of IDT-PDOT. The electron mobility of the IDT-EDOT based blend film is one order of magnitude higher than that of IDT-PDOT based one. Consequently, a high power conversion efficiency (PCE) of 11.32% for IDT-EDOT based devices was obtained; whereas a PCE of only 2.18% was achieved for IDT-PDOT based ones. Our results have demonstrated that changing the π-bridging unit in fused ring acceptors is an effective strategy to adjust the photovoltaic performance.

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Publication details

The article was received on 30 Aug 2018, accepted on 01 Oct 2018 and first published on 03 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08410F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Influence of the π-Bridging Unit of Fused-Ring Acceptor on the Performance of Organic Solar Cells

    P. Jiang, S. Ming, Q. Jia, Y. Liu, H. Lu, M. Li, X. Xu, H. Li and Z. Bo, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08410F

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