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Title: New scenarios of charge transport in PEDT:PSS conducting polymer: From hole resonant tunneling to cationic motion and relaxation
Authors: Xie, X.N. 
Lee, K.K.
Chen, X. 
Loh, K.P. 
Sow, C.H. 
Wee, A.T.S. 
Keywords: Cationic motion and relaxation
Negative differential resistance
Issue Date: Aug-2010
Citation: Xie, X.N., Lee, K.K., Chen, X., Loh, K.P., Sow, C.H., Wee, A.T.S. (2010-08). New scenarios of charge transport in PEDT:PSS conducting polymer: From hole resonant tunneling to cationic motion and relaxation. Organic Electronics: physics, materials, applications 11 (8) : 1432-1438. ScholarBank@NUS Repository.
Abstract: This work reports a series of distinct current density∼field (JE) characteristics of the poly(3,4-ethylenedioxythiophene) and poly(styrene sulfonic acid) (or PDET:PSS) conducting polymer system. Symmetrical and asymmetrical negative differential resistance (NDR) behaviors are observed for metal/PEDT:PSS/metal sandwich devices, and these novel behaviors are related to hole injection and resonant tunneling, hole blockage and extraction, and ionic motion in the PEDT:PSS films. Both the PEDT:PSS/metal interface configuration and film thickness have strong effect on the manifestation of the NDR characteristic. It is proposed that phase segregation in μm-thick PEDT:PSS films could lead to the conversion of hole-dominated transport to ionic motion-dominated conduction, thus causing a drastic change in JE characteristics of films with different thickness. Our results highlight the important effect of PEDT:PSS/metal interface and PEDT:PSS film thickness on charge conduction, and broaden our current understanding of this model organic system with both electronic and ionic conducting components. © 2010 Elsevier B.V. All rights reserved.
Source Title: Organic Electronics: physics, materials, applications
ISSN: 15661199
DOI: 10.1016/j.orgel.2010.05.013
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