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Stable solvent for solution-based electrical doping of semiconducting polymer films and its application to organic solar cells

Abstract

The immersion of polymeric semiconducting films into a polyoxometalate (PMA) solution was found to lead to electrical doping over a limited depth, enabling the fabrication of organic photovoltaic devices with simplified geometry; yet, the technique was highly solvent selective and the use of nitromethane was found limiting. Here, we report on the use of acetonitrile as an alternative solvent to nitromethane. Morphology studies on pristine and PMA doped P3HT films suggest that dopants reside in between the lamella of the polymer, but cause no distortion to the P3HT π-π stacking. With this information, we propose an explanation to the observed solvent-selectivity of the doping method. Degradation studies reveal a superior stability of films doped with PMA in acetonitrile. Based on these findings, we believe that the post-process immersion technique, when dissolving PMA in acetonitrile, is a more suitable candidate to conduct solution-based electrical p-doping of organic semiconductors on an industrial scale.

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Publication details

The article was received on 19 Mar 2018, accepted on 18 May 2018 and first published on 18 May 2018


Article type: Paper
DOI: 10.1039/C8EE00811F
Citation: Energy Environ. Sci., 2018, Accepted Manuscript
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    Stable solvent for solution-based electrical doping of semiconducting polymer films and its application to organic solar cells

    F. A. Larrain Benavides, C. Hernandez, W. Chou, V. Rodriguez-Toro, T. Huang, M. F. Toney and B. Kippelen, Energy Environ. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C8EE00811F

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