Electronic properties of junctions between aluminium and polyaniline doped with dodecylbenzene sulphonate

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Abstract

Polyaniline (PANI) doped with dodecylbenzene sulphonate (DBS) anions forms a conducting organic solid. Aluminium contacts to PANI(DBS) polymer are studied using complex impedance spectroscopy, current-voltage and capacitance-voltage characteristics measurements. The I-V characteristic is asymmetric and non-ohmic and rectification. The C-V measurements show that the dopant profile is not uniform throughout the polymer. The complex impedance spectra show two partially overlapping semicircles which reveal the existence of two distinct regions at the metal/doped polymer interface. They are modelled by an equivalent circuit consisting of two parallel RC circuits in series representing a thin interfacial insulating (S') layer and a depletion (S) region. The device is therefore an MS'S type, where S' and S are the same chemical compounds having different dopany concentrations.

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Workalemahu, B. (1999). Electronic properties of junctions between aluminium and polyaniline doped with dodecylbenzene sulphonate. Bulletin of the Chemical Society of Ethiopia, 13(2), 143–154. https://doi.org/10.4314/bcse.v13i2.21068

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