Electric field activated nonlinear anisotropic charge transport in doped polypyrrole

Varade, Vaibhav and Anjaneyulu, P and Sangeeth, C S Suchand and Ramesh, K P and Menon, R (2013) Electric field activated nonlinear anisotropic charge transport in doped polypyrrole. In: APPLIED PHYSICS LETTERS, 103 (23).

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Abstract

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, m(T) and characteristic length, L-E are estimated to characterize the transport in both the geometries. (C) 2013 AIP Publishing LLC.

Item Type:	Journal Article
Publication:	APPLIED PHYSICS LETTERS
Publisher:	AMER INST PHYSICS
Additional Information:	copyright for this article belongs to AMER INST PHYSICS,USA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	22 Jan 2014 04:36
Last Modified:	22 Jan 2014 04:36
URI:	http://eprints.iisc.ac.in/id/eprint/48215

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