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Constructing efficient organic photovoltaic devices with a spirobifluorene based water/alcohol-soluble cathode interlayer

Abstract

A water/alcohol soluble small molecular cathode interlayer (CIL) with the quaternary ammonium ions terminated trihydroxybenzene as the pendant polar functionalities and the commercially available spirobifluorene (SBF) as 3D-structural conjugated backbone, namely TBSBF, was synthesized and applied in conventional single-junction polymer solar cells (PSCs). The TBSBF could effectively enhance the performace of the PSCs with simultaneously increased open-circuit voltage (Voc), short-circuit current (Jsc) and fill factor (FF). Combined measurements of current density–voltage characteristics, ultraviolet photoemission spectroscopy (UPS) and the electron mobility demonstrated that TBSBF could effectively increase the built-in potential and electronic mobility, leading to higher performence of the devices. In addition, the atomic force microscopy (AFM) measurements showed that the TBSBF could self-assemble into leopard print like pattern on the hydrophobic active layer surface. These results not only indicate TBSBF was a promising CIL material for the future solution-processed PSCs, but also provide a new way to design efficient CILs with good film-formation property.

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Publication details

The article was received on 17 Feb 2018, accepted on 15 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ00807H
Citation: New J. Chem., 2018, Accepted Manuscript
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    Constructing efficient organic photovoltaic devices with a spirobifluorene based water/alcohol-soluble cathode interlayer

    Y. Miao, Y. Xu, Y. Zhang, X. Yan, K. Ye and Y. Wang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00807H

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