Temperature dependent charge transport of acid-treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films

Sharma, M and Maity, KP and Rani, S and Prasad, V and Sameera, I and Bhatia, R (2020) Temperature dependent charge transport of acid-treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films. In: Journal of Applied Physics, 128 (15).

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Abstract

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is an important opto-electronic material, and its room temperature electrical conductivity can be prominently enhanced by chemical treatment; it is technologically significant to investigate its temperature and magnetic field dependent charge transport characteristics. Here, we analyzed the low temperature charge transport properties of pristine and acid-treated PEDOT:PSS thin films by studying the variation in resistance as a function of temperature and magnetic field (T ~300 to 4.2 K, H ~up to 5 T). The acid-treated sample exhibited much improved charge transport behavior at low T, with a resistivity ratio �(4.2 K)/�(300 K) of ~5.7 � 102, which is three orders of magnitude smaller than that of the pristine sample. Nevertheless, both pristine and acid-treated samples followed hopping conduction, obeying R (T) � exp T -1/2. and R (T) � exp T -1/3, respectively, in the low T regime. Furthermore, positive magnetoresistance of ~16% (at 4.2 K and 5 T) was displayed by acid-treated samples that could be due to the wave function shrinkage phenomenon. © 2020 Author(s).

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics Inc.
Additional Information:	The copyright of this article belongs to American Institute of Physics Inc.
Keywords:	Carrier transport; Magnetic fields; Temperature; Thin films; Wave functions, Electrical conductivity; Opto-electronic materials; PEDOT:PSS thin films; Poly(3 ,4-ethylenedioxythiophene):poly(styrenesulfonate); Positive magnetoresistance; Temperature dependent; Three orders of magnitude; Transport characteristics, Conducting polymers
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	29 Jan 2021 11:23
Last Modified:	29 Jan 2021 11:23
URI:	http://eprints.iisc.ac.in/id/eprint/67354

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