Electrical conduction mechanism in conjugated polymers studied using Flicker noise spectroscopy

Electrochimica Acta Volume 51 Issue 13 Page 2656-2661 published_at 2006-05-05
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Title ( eng )
Electrical conduction mechanism in conjugated polymers studied using Flicker noise spectroscopy
Creator
Parkhutik Vitali
Patil Rahul
Source Title
Electrochimica Acta
Volume 51
Issue 13
Start Page 2656
End Page 2661
Abstract
We have performed detailed analysis of the fluctuations of the electrical current in electrochemically deposited conductive polymers (CP) using as example polyaniline and poly(3- methylthiophene). These heterogeneous and disordered materials cannot be analyzed in terms of classical conduction mechanisms (like Schottky or Poole-Frenkel emission). Instead, the electrical transport in CPs is to be considered as a stochastic process with large component of noise. We have been able to distinguish several modes of the conduction process in CPs by applying Flicker Noise Spectroscopy. Thus, we have established that the transport of charge carriers in highly doped CPs is much less correlated than in non-doped ones at the same electric field strength. While applied electric field increases, correlations become lower in a sequence of elementary events contributing to the conductivity of CP. Apparently, the change in the correlation length corresponds to changing mechanism of the electrical conduction. The lower correlation in highly doped sample can be attributed to various factors including change in CP conformation, enhancement in interchain charge transfer and generation of polaron lattice.
Keywords
Conjugated polymers
power spectra of autocorrelation function
structural function of second order
percolation threshold
NDC
Chemical technology [ 570 ]
Language
eng
Resource Type journal article
Publisher
Elsevier
Date of Issued 2006-05-05
Rights
Copyright (c) 2006 Elsevier Ltd.
Publish Type Author’s Original
Access Rights open access
Source Identifier
[ISSN] 0013-4686
[DOI] 10.1016/j.electacta.2005.08.005
[NCID] AA00633261
[DOI] http://dx.doi.org/10.1016/j.electacta.2005.08.005 isVersionOf