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Title: Effect of incorporation of ethylene glycol into PEDOT:PSS on electron phonon coupling and conductivity

The effect of incorporation of ethylene glycol (EG) into poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) on electron phonon coupling and conductivity is investigated. It is shown that the carrier density (N{sub C}) increases significantly and the carrier mobility (μ) increases slightly at 300 K. The increased intensity of the Raman spectrum between 1400 and 1450 cm{sup −1}, following EG treatment (that is, the quinoid-dominated structures of the PEDOT chain), leads to an increase in the number of polarons (bipolarons), which leads to an increase in N{sub C}. In addition, μ in PEDOT:PSS samples with or without EG addition exhibits a strong temperature dependence, which demonstrates the dominance of tunneling (hopping) at low (high) temperatures. The high conductivity of PEDOT:PSS samples with the addition of EG is attributed to the combined effect of the modification of the electron-phonon coupling and the increase in N{sub C} (μ)
Authors:
;  [1] ;  [2]
  1. Institute of Photonics, National Changhua University of Education, Changhua 500, Taiwan (China)
  2. Department of Physics, National Changhua University of Education, Changhua 500, Taiwan (China)
Publication Date:
OSTI Identifier:
22412896
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CARRIER DENSITY; CARRIER MOBILITY; ELECTRIC CONDUCTIVITY; ELECTRON-PHONON COUPLING; GLYCOLS; MODIFICATIONS; ORGANIC POLYMERS; POLARONS; RAMAN SPECTRA; TEMPERATURE DEPENDENCE; TUNNEL EFFECT