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Issue 9, 2011
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Synthesis, thin-film morphology, and comparative study of bulk and bilayer heterojunction organic photovoltaic devices using soluble diketopyrrolopyrrole molecules

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Abstract

Diketopyrrolopyrrole (DPP)-based organic semiconductors EH-DPP-TFP and EH-DPP-TFPV with branched ethyl-hexyl solubilizing alkyl chains and end capped with trifluoromethyl phenyl groups were designed and synthesized via Suzuki coupling. These compounds show intense absorptions up to 700 nm, and thin film-forming characteristics that sensitively depend on the solvent and coating conditions. Both materials have been used as electron donors in bulk heterojunction and bilayer organic photovoltaic (OPV) devices with fullerenes as acceptors and their performance has been studied in detail. The best power conversion efficiency of 3.3% under AM1.5G illumination (100 mW cm−2) was achieved for bilayer solar cells when EH-DPP-TFPV was used with C60, after a thermal annealing step to induce dye aggregation and interdiffusion of C60 with the donor material. To date, this is one of the highest efficiencies reported for simple bilayer OPV devices.

Graphical abstract: Synthesis, thin-film morphology, and comparative study of bulk and bilayer heterojunction organic photovoltaic devices using soluble diketopyrrolopyrrole molecules

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Publication details

The article was received on 25 Apr 2011, accepted on 10 Jun 2011 and first published on 25 Jul 2011


Article type: Paper
DOI: 10.1039/C1EE01544C
Citation: Energy Environ. Sci., 2011,4, 3617-3624

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    Synthesis, thin-film morphology, and comparative study of bulk and bilayer heterojunction organic photovoltaic devices using soluble diketopyrrolopyrrole molecules

    W. Kylberg, P. Sonar, J. Heier, J. Tisserant, C. Müller, F. Nüesch, Z. Chen, A. Dodabalapur, S. Yoon and R. Hany, Energy Environ. Sci., 2011, 4, 3617
    DOI: 10.1039/C1EE01544C

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