Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7873795 | Synthetic Metals | 2017 | 5 Pages |
Abstract
Thin films of semiconducting polyaniline hydrochloride were deposited on glass or silicon substrates. Frequency spectra of impedance measured at several voltages display regions of holes and polarons contributions and enable to evaluate their mobility 2.7Â ÃÂ 10â5Â cm2Â Vâ1Â sâ1 at the electric field of 1Â ÃÂ 105Â VÂ cmâ1. Good agreement of the average value 2.4Â ÃÂ 10â5Â cm2Â Vâ1Â sâ1 of holes mobility was obtained by another method-charge extraction by linearly increasing voltage (CELIV). A Poole-Frenkel type of electric field dependence of mobility assessed by frequency- dependent impedance points to trapping of the charge carriers. From the value of the work function measured by the Kelvin probe and from the position of HOMO level, the hole concentration 2.9Â ÃÂ 1018Â cmâ3 was obtained. Using this concentration together with the mobility measured by the impedance spectroscopy and the CELIV method, the conductivity 1.2Â ÃÂ 10â5Â SÂ cmâ1 carried by holes was estimated. Our results widen the work dealing with the mixed electron and proton conductivity of polyaniline films in aqueous solution of acids published in the literature.
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Authors
J. TouÅ¡ek, J. TouÅ¡ková, R. Chomutová, I. KÅivka, M. Hajná, J. Stejskal,