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Title of Journal: Appl Phys A

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Abbravation: Applied Physics A

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Springer Berlin Heidelberg

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DOI

10.1002/jhet.5570410216

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1432-0630

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Electrical conduction mechanism of poly34ethyle

Authors: P Chutia A Kumar
Publish Date: 2015/06/07
Volume: 120, Issue: 3, Pages: 1059-1068
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Abstract

The nature of charge transport mechanism in poly34ethylenedioxythiophene nanofiber bundles has been studied as a function of temperature magnetic field and AC electric field Highresolution transmission electron micrographs show the formation of nanofibers with an average diameter of 14 nm Xray diffraction analysis depicts the enhancement of polymer chains ordering with increasing dopant concentration Analysis of the temperature dependence of resistivity reveals a threedimensional variable range hopping electrical conduction mechanism in the synthesized nanofibers system A large positive magnetoresistance has been observed at low temperature which shows a decreasing trend with increasing temperature as well as dopant concentration The high value of positive magnetoresistance at low temperature has been explained by the wave function shrinkage model The decrease in frequency exponent s with increasing temperature suggests that the AC conduction takes place through correlated barrier hopping mechanismAuthors acknowledge the financial support provided by UGCDAECSR Indore Centre India through project Grant No CSRI/CRS50/50 Authors sincerely thank Dr R Rawat Scientist UGCDAECSR Indore Centre and Dr K Asokan Scientist IUAC for providing the facilities to carry out the DC resistivity magnetoresistance and AC conductivity measurements and for their scientific discussion during the experiment

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