Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 92, Issue 9, Pages 1170-1174Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2008.04.006
Keywords
triphenylamine; tetrathiafulvalene; star-shaped systems; solar cells
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Hybrid conjugated systems consisting of a triphenylamine core substituted by three dithialfulvenyl moieties have been synthesized and tested as active materials in organic field-effect transistors and photovoltaic devices. UV-vis. spectroscopy Studies demonstrate that, despite their amorphous character shown by X-ray diffraction and differential scanning calorimetry, strong interactions exist in these materials as an aggregative band is observed at low energies. A first evaluation of their potentialities as 1) semiconductor in organic field-effect transistors shows significant hole mobilities. For bilayer photovoltaic devices, a power conversion efficiency of 0.11% is observed and the external quantum efficiency of the cell under monochromatic irradiation shows a non-negligible contribution of the aggregative bind. (c) 2008 Elsevier B.V. All rights reserved.
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