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Field dependent and disorder-induced nonlinear charge transport in electrochemically doped polypyrrole devices

Anjaneyulu, P and Varade, Vaibhav and Sangeeth, Suchand CS and Ramesh, KP and Menon, R (2014) Field dependent and disorder-induced nonlinear charge transport in electrochemically doped polypyrrole devices. In: JOURNAL OF PHYSICS D-APPLIED PHYSICS, 47 (50).

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Official URL: http://dx.doi.org/ 10.1088/0022-3727/47/50/505106

Abstract

Electric field activated charge transport is studied in the metal/polymer/metal device structure of electropolymerized polypyrrole down to 10 K with varying carrier density and disorder. Disorder induced nonlinear behaviour is observed in polypyrrole devices grown at room temperature which is correlated to delocalization of states. The slope parameter of currentvoltage characteristics (in log-log scale) increases as the temperature decreases, which indicates the onset of stronger field dependence. The field dependence of mobility becomes dominant as the carrier density decreases. The sharp dip in differential conductance indicates the localization of carriers at low temperatures which reduces the effective number of carriers involved in the transport.

Item Type: Journal Article
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Additional Information: Copyright for this article belongs to the IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Keywords: conjugated polymers; disorder; localization
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 12 Jan 2015 04:44
Last Modified: 12 Jan 2015 04:44
URI: http://eprints.iisc.ernet.in/id/eprint/50557

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