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Journal of Photonics for Energy • Open Access

Organic solar cells based on acceptor-functionalized diketopyrrolopyrrole derivatives
Author(s): Sanjay S. Ghosh; Luis A. Serrano; Bernd Ebenhoch; Vincent M. Rotello; Graeme Cooke; Ifor D. W. Samuel

Paper Abstract

The synthesis and characterization of three solution processable diketopyrrolopyrrole (DPP) derivatives featuring acceptor units attached to the core by alkyne linker units is reported. Cyclic voltammetry and density functional theory calculations indicate that the DPP derivatives possess similar HOMO and LUMO energies. Solar cells were fabricated by blending the synthesized DPP derivatives with [6,6]-phenyl-C71-butyrate methyl ester. The influence of donor:acceptor blend ratio, film thickness, annealing temperature, and annealing time on device performance was studied. Differences in device performance were related to atomic force microscopy measurements of the films. The highest power conversion efficiency of 1.76% was achieved for the DPP derivative functionalized with an aldehyde electron-withdrawing group with a 1∶0.7 donor:acceptor ratio when the active layer was annealed for 10 min at 110°C.

Paper Details

Date Published: 12 June 2015
PDF: 13 pages
J. Photon. Energy 5(1) 057215 doi: 10.1117/1.JPE.5.057215
Published in: Journal of Photonics for Energy Volume 5, Issue 1
Show Author Affiliations
Sanjay S. Ghosh, Univ. of St. Andrews (United Kingdom)
Luis A. Serrano, Univ. of Glasgow (United Kingdom)
Bernd Ebenhoch, Univ. of St. Andrews (United Kingdom)
Vincent M. Rotello, Univ. of Massachusetts Amherst (United States)
Graeme Cooke, Univ. of Glasgow (United Kingdom)
Ifor D. W. Samuel, Univ. of St. Andrews (United Kingdom)

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