Exponential behavior of the Ohmic transport in organic films
ORAL
Abstract
An exponential dependence of conductance on thickness and temperature was found in the low voltage, Ohmic regime of copper (CuPc) and cobalt (CoPc) phthalocyanine, sandwiched between palladium and gold electrodes, unlike ever claimed in organic materials. A comparison with conventional models fails to explain all the data with a single set of parameters. On the other hand, a model which incorporates tunneling between localized states with thermally-induced overlap agrees with the data, and decouples the contributions to conductance from the electrode-film interface and the bulk of the film. Work supported by AFOSR, DOE and the UCOP program on carbon nanostructures.
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Authors
Corneliu Colesniuc
Department of Physics and Center for Advanced Nanotechnology, University of California San Diego, La Jolla, California 92093
Rudro Biswas
Department of Physics, Harvard University, Cambridge, Massachusetts 02138
Harvard
Samuel Hevia
Facultad de F\'isica, Universidad Cat\'olica de Chile, Casilla 306, Santiago, Chile 6904411
Alexander Balatsky
Los Alamos National Laboratory
Theoretical Division and Center for Integrated Nano-Technologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
LANL
Theoretical Division, Los Alamos National Laboratory and Center for Integrated Nanotechnologies, Los Alamos, NM 87545
Los Alamos National Lab
Theoretical Division, Los Alamos National Laboratory
I.K. Schuller
Department of Physics and Center for Advanced Nanotechnology, University of California San Diego, La Jolla, California 92093
University of California, San Diego
Department of Physics and Center for Advanced Nanoscience, University of California San Diego, La Jolla CA 92093
