Variable range hopping and/or phonon-assisted tunneling mechanism of electronic transport in polymers and carbon nanotubes

We review and compare two models recently used to describe electronic transport in polymer fibers/nanotubes and carbon nanotubes including graphene nanoribbons, namely, variable range hopping (VRH) in different versions and their modifications on the one hand and electric-field-induced phonon-assist...

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Bibliographic Details
Published in:Central European journal of physics 2012-04, Vol.10 (2), p.271-281
Main Authors: Pipinys, Povilas, Kiveris, Antanas
Format: Article
Language:English
Subjects:
Biological and Medical Physics
Biophysics
electronic transport in polymers fibers/nanotubes and carbon nanotubes
Environmental Physics
Geophysics/Geodesy
phonon-assisted tunneling
Physical Chemistry
Physics
Physics and Astronomy
Review Article
variable range hopping
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Summary:We review and compare two models recently used to describe electronic transport in polymer fibers/nanotubes and carbon nanotubes including graphene nanoribbons, namely, variable range hopping (VRH) in different versions and their modifications on the one hand and electric-field-induced phonon-assisted tunneling (PhAT) on the other hand. The VRH model is mainly approved on behalf of the results of temperature dependences. However, the field dependencies of the conductivity in the framework of this model remain practically unexplained. At the same time, the PhAT model describes properly not only temperature dependence of conductivity measured in a wide temperature range, but also conductivity/current dependences on field strength using the same set of parameters characterizing the materials
ISSN:1895-1082
2391-5471
1644-3608
2391-5471
DOI:10.2478/s11534-012-0005-3