Thermal degradation mechanisms of PEDOT:PSS |
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| Authors: | E Vitoratos S Sakkopoulos E Dalas N Paliatsas D Karageorgopoulos F Petraki S Kennou SA Choulis |
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| Affiliation: | 1. Department of Physics, University of Patras, 265 00 Patras, Greece;2. Department of Chemistry, University of Patras, 265 00 Patras, Greece;3. Department of Chemical Engineering, University of Patras, 265 00 Patras, Greece;4. Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, 3603 Limassol, Cyprus |
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| Abstract: | The thermal stability of thin (50 nm) PEDOT:PSS films, was investigated by dc conductivity measurements, X-ray and UV photoelectron spectroscopies as a function of heating temperature and heating time. The mechanism of electrical conductivity as a function of temperature is consistent with a hopping type carrier transport. The electrical conductivity decreased, as a function of time, in agreement with a granular metal type structure, in which aging is due to the shrinking of the PEDOT conductive grains. XPS and UPS spectra indicate that conformational changes of the PEDOT:PSS film are responsible for this behaviour and a model for these modifications is proposed. |
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