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

Kylberg, W., Sonar, P., Heier, J., Tisserant, J. N., Müller, C., Nüesch, F., Chen, Z. K., Dodabalapur, A., Yoon, S., & Hany, R. (2011) Synthesis, thin-film morphology, and comparative study of bulk and bilayer heterojunction organic photovoltaic devices using soluble diketopyrrolopyrrole molecules. Energy and Environmental Science, 4(9), pp. 3617-3624.

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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 C 60, after a thermal annealing step to induce dye aggregation and interdiffusion of C 60 with the donor material. To date, this is one of the highest efficiencies reported for simple bilayer OPV devices.

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23 citations in Scopus
24 citations in Web of Science®
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ID Code: 75221
Item Type: Journal Article
Refereed: Yes
Keywords: A-thermal, Alkyl chain, Bi-layer, Bulk heterojunction, Comparative studies, Diketopyrrolopyrroles, Dye aggregation, Electron donors, Film-forming, Organic photovoltaic devices, Power conversion efficiencies, Suzuki couplings, Thin film morphology, Trifluoromethyl phenyl group, Conversion efficiency, Photovoltaic effects, Synthesis (chemical), Heterojunctions, adsorption, comparative study, dye, electron, energy efficiency, fuel cell, molecular analysis, photovoltaic system, solar power, solvent
DOI: 10.1039/c1ee01544c
ISSN: 1754-5692
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 The Royal Society of Chemistry
Deposited On: 27 Oct 2014 23:55
Last Modified: 29 Oct 2014 23:54

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