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Title: Sensitized and intrinsic in-plane photocurrents in Langmuir-Blodgett films of 7-(2-anthryl)-1-heptanoic acid
Authors: Vaes, A ×
Van der Auweraer, Mark
Bosmans, P
De Schryver, Frans #
Issue Date: Jan-1998
Publisher: American Chemical Society
Series Title: Journal of Physical Chemistry B, Materials, Surfaces, Interfaces & Biophysical vol:102 issue:28 pages:5451-5459
Abstract: Langmuir-Blodgett (LB) films of an amphiphilic long-chain derivative of anthracene, of which the molecular packing shows a strong resemblance with the ab-plane of anthracene crystals, were investigated with respect to their photoconductive properties. Efficient photoinduced charge carrier generation and in-plane charge transport have been observed in LB-films of (2A7), using a gap configuration. The wavelength and intensity dependence of the quantum yield of the photocurrent in absence of a photosensitizer suggest an intrinsic bulkcharge generation mechanism. The intensity dependence of the photocurrent suggests a combination of nongeminate and alien recombination of charge carriers. The increase of the quantum yield in the presence of air is an indication that, upon photoexcitation, mobile holes are formed. By covering the multilayer assembly with a rhodamine containing monolayer, a significant increase of the quantum yield is obtained upon excitation of both the anthracene chromophore and the dye. In the case of dye excitation, the values and the field dependence of the photocurrents due to the photosensitized injection of holes from the layer of excited dye molecules into the 2A7 multilayer resemble those obtained for anthracene crystals covered by adsorbed dyes.
URI: 
ISSN: 1089-5647
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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