Issue 11, 2007

Fluorene functionalised sexithiophenes—utilising intramolecular charge transfer to extend the photocurrent spectrum in organic solar cells

Abstract

A new series of oligothiophenes bearing electron deficient fluorene units have been prepared and characterised. The materials are functionalised by C8/C11 alkyl chains or triethylene glycol side groups, yet the higher oligomers remain poorly soluble. The absorption characteristics of a sexithiophene analogue (compound 3) have been studied by UV-vis and photoinduced absorption spectroscopy. Photovoltaic cells have been fabricated from blends of 3 and fullerene derivative [6,6]-phenyl-C61 butyric acid methyl ester (PCBM). The photocurrent spectrum of the device matches the absorption spectrum of the sexithiophene system which incorporates an intramolecular charge transfer band arising from the 1,3-dithiole-fluorene units. A modest power conversion efficiency of 0.1% was achieved.

Graphical abstract: Fluorene functionalised sexithiophenes—utilising intramolecular charge transfer to extend the photocurrent spectrum in organic solar cells

Supplementary files

Article information

Article type
Paper
Submitted
11 Jul 2006
Accepted
28 Nov 2006
First published
14 Dec 2006

J. Mater. Chem., 2007,17, 1055-1062

Fluorene functionalised sexithiophenes—utilising intramolecular charge transfer to extend the photocurrent spectrum in organic solar cells

P. J. Skabara, R. Berridge, I. M. Serebryakov, A. L. Kanibolotsky, L. Kanibolotskaya, S. Gordeyev, I. F. Perepichka, N. S. Sariciftci and C. Winder, J. Mater. Chem., 2007, 17, 1055 DOI: 10.1039/B609858D

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