Electrical Conductivity, Thermoelectric Power,
and Optical Properties of Organo-Soluble
Polyaniline Organic Semiconductor |
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Authors: | Fahrettin Yakuphanoglu Bah?re F?l?z ?enkal Ayfer Saraç |
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Affiliation: | (1) Department of Physics, Faculty of Arts and Sciences, Fırat University, 23119 Elazig, Turkey;(2) Department of Chemistry, Faculty of Arts and Sciences, Istanbul Technical University, Maslak, Istanbul, 34469, Turkey;(3) Chemistry Department, Yildiz Technical University, Davutpasa Campus, 34220 Esenler, Istanbul, Turkey |
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Abstract: | The electrical conductivity, thermoelectric power (TEP), and optical properties of organo-soluble polyaniline doped with HCl
have been investigated. The electrical conductivity and TEP of the sample increase with increasing temperature. The electrical
conductivity and TEP results of the polymer suggest that it is a p-type semiconductor. The fundamental absorption edge in the polymer is formed by the direct allowed transitions, and the optical
band gap value was found to be 2.79 eV. The absorption spectra for an acidic solution of the polymer indicate two new absorption
bands, which are due to polaron formation. The polaron bands are responsible for the conductivity of the polymer. The TEP
results indicate that the conductivity mechanism of the polymer is controlled by the large polaron hopping model. |
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Keywords: | Organic semiconductor polyaniline thermoelectric power |
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