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Thin Films of Molecular Metals TTF-TCNQ

✍ Scribed by J. Fraxedas; S. Molas; A. Figueras; I. Jiménez; R. Gago; P. Auban-Senzier; M. Goffman

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
583 KB
Volume
168
Category
Article
ISSN
0022-4596

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✦ Synopsis

We present recent results on the characterization of highly ordered polycrystalline thin films of the charge transfer salt TTF-TCNQ (TTF=tetrathiafulvalene, TCNQ=tetracyanoquinodimethane) prepared by thermal sublimation in high vacuum under different conditions. The increase in orientation and microcrystal size as a function of substrate and annealing temperatures is addressed. A consequence of such an increase is the reduction of the conductivity activation energy, which eventually leads to the observation of the Peierls transition by resistivity measurements. X-ray absorption near edge spectroscopy studies performed with synchrotron radiation reveal directly the influence of charge transfer on unoccupied states near the Fermi level.

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Infrxed spectrv of TTF-TCAQ in inert gzs matrices and in thin fiLms deposited below room temperature shk the presence of TTF" and TCNQO. Lmmwities such as TTF" and TCNQ' in thin films and other forms of TTF-TCNQ may account for the variation in the condu&ity measurements reported thus far.