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New NIR Absorbing DPP-based Polymer for Thick Organic Solar Cells

Abstract

infrared region (NIR) for better photon harvesting in organic solar cells. It has been shown that copolymers compromising diketopyrrolopyrrole based acceptors and simple donors (thiophene or furan) achieve absorption maximum around 800 nm. In this study, the selenophene based donor units coupled with diketopyrrolopyrrole acceptor unit based polymer (PFDPPSe) was synthesized with an absorption maximum at 830 nm and absorption onset of 930 nm. The optimized organic solar cells with PFDDPSe: PC71BM active layer blends of 210 nm showed maximum PCE of 6.16 % (ave. 6.02 %) via solvent additive engineering with inverted device structure. Charge transport, recombination loss mechanism, and morphology are systematically studied. These results demonstrate that highly efficient NIR polymer can be achieved by the introduction of selenophene and a suitable solvent additive process suitable for NIR organic solar cells. PFDPPSe is also one of the rare examples of a polymer with a PCE over 6% that does not contain any thiophene-based unit in its backbone.

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Publication details

The article was received on 08 Jan 2018, accepted on 04 Feb 2018 and first published on 05 Feb 2018


Article type: Paper
DOI: 10.1039/C8TC00113H
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    New NIR Absorbing DPP-based Polymer for Thick Organic Solar Cells

    G. Oklem, X. Song, L. Toppare, D. Baran and G. Gunbas, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC00113H

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