Electric field activated nonlinear anisotropic charge transport in doped polypyrrole

Electric field activated nonlinear transport is investigated in polypyrrole thin film in both in-plane and out-of-plane geometries down to 5 K and strong anisotropy is observed. A morphological model is suggested to explain the anisotropy through inter-chain and intra-chain transport. The deviation...

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Bibliographic Details
Published in:Applied physics letters 2013-12, Vol.103 (23)
Main Authors: Varade, Vaibhav, Anjaneyulu, P., Suchand Sangeeth, C. S., Ramesh, K. P., Menon, R.
Format: Article
Language:English
Subjects:
Activated
Anisotropy
Applied physics
Chains
Charge transport
Electric fields
Nonlinear analysis
Nonlinearity
Polypyrroles
Resistance
Thin films
Variation
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Summary:Electric field activated nonlinear transport is investigated in polypyrrole thin film in both in-plane and out-of-plane geometries down to 5 K and strong anisotropy is observed. A morphological model is suggested to explain the anisotropy through inter-chain and intra-chain transport. The deviation from the variable range hopping at low temperature is accounted by fluctuation assisted transport. From Zabrodaskii plots, it is found that electric field can tune the transport from insulating to metallic regime. Glazman–Matveev model is used to describe the nonlinear conduction. Field scaling analysis shows that conductance data at different temperature falls on to a single curve. Nonlinearity exponent, mT and characteristic length, LE are estimated to characterize the transport in both the geometries.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4840335