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Solution-Processed Poly(3,4-ethylenedioxythiophene) Thin Films as Transparent Conductors: Effect of p-Toluenesulfonic Acid in Dimethyl Sulfoxide

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Title Solution-Processed Poly(3,4-ethylenedioxythiophene) Thin Films as Transparent Conductors: Effect of p-Toluenesulfonic Acid in Dimethyl Sulfoxide
 
Creator MUKHERJEE, S
SINGH, R
GOPINATHAN, S
MURUGAN, S
GAWALI, S
SAHA, B
BISWAS, J
LODHA, S
KUMAR, A
 
Subject PEDOT-PSS
transparent conducting polymer
conductivity enhancement
organic acid treatment
dye-sensitized solar cell
SENSITIZED SOLAR-CELLS
FREE COUNTER ELECTRODE
LIGHT-EMITTING-DIODES
CARBON NANOTUBE FILMS
POLYMER-FILMS
PEDOT-PSS
CONDUCTIVITY ENHANCEMENT
ELECTRICAL-CONDUCTIVITY
ORGANIC PHOTOVOLTAICS
OXYGEN REDUCTION
 
Description Conductivity enhancement of thin transparent films based on poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) by a solution-processed route involving mixture of an organic acid and organic solvent is reported. The combined effect of p-toluenesulfonic acid and dimethyl sulfoxide on spin-coated films of PEDOT-PSS on glass substrates, prepared from its commercially available aqueous dispersion, was found to increase the conductivity of the PEDOT-PSS film to similar to 3500 S.cm(-1) with a high transparency of at least 94%. Apart from conductivity and transparency measurements, the films were characterized by Raman, infrared, and X-ray photoelectron spectroscopy along with atomic force microscopy and secondary ion mass spectrometry. Combined results showed that the conductivity enhancement was due to doping, rearrangement of PEDOT particles owing to phase separation, and removal of PSS matrix throughout the depth of the film. The temperature dependence of the resistance for the treated films was found to be in accordance with one-dimensional variable range hopping, showing that treatment is effective in reducing energy barrier for interchain and interdomain charge hopping. Moreover, the treatment was found to be compatible with flexible poly(ethylene terephthalate) (PET) substrates as well. Apart from being potential candidates to replace inorganic transparent conducting oxide materials, the films exhibited stand-alone catalytic activity toward I-/I-3(-) redox couple as well and successfully replaced platinum and fluorinated tin oxide as counter electrode in dye-sensitized solar cells.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-12-29T05:33:12Z
2014-12-29T05:33:12Z
2014
 
Type Article
 
Identifier ACS APPLIED MATERIALS & INTERFACES, 6(20)17792-17803
1944-8244
http://dx.doi.org/10.1021/am504150n
http://dspace.library.iitb.ac.in/jspui/handle/100/17203
 
Language English