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EFFECT OF PHASE CHANGE ON DIELECTRIC PROPERTIES OF ZINC PHTHALOCYANINE THIN FILMS

Esmat Abdel-Fattah I. Saad1,*

Affiliation

  1. Department of Engineering Physics and Mathematics, Faculty of Engineering, Ain Shams University, Cairo, Egypt

Abstract

The dielectric constant , and dielectric loss , of zinc phthalocyanine (ZnPc) thin films, are investigated in the frequency range 1–100 kHz and within the temperature range 293 – 415 K. Both the dielectric constant and dielectric loss were found to increase with temperature and decrease with frequency. The Cole – Cole plots have been used to determine the molecular relaxation time . Results reveal that the temperature-dependence of is a thermally activated process. The optical dielectric constant was found to increase with temperature. The frequency dependence of the impedance spectra plotted in the complex plane shows semicircles. The system could be represented by an equivalent circuit of a bulk resistance in series with a parallel surface resistance-capacitance combination. Transition in ZnPc films from the -phase to the -phase has been observed at ~390 K, in molecular relaxation time , optical dielectric constant , and dc conductivity dc..

Keywords

Zinc phthalocyanine, Thin films, Dielectric properties, Phase change, Cole – Cole plots.

Submitted at: June 30, 2005
Accepted at: Nov. 24, 2005

Citation

Esmat Abdel-Fattah I. Saad, EFFECT OF PHASE CHANGE ON DIELECTRIC PROPERTIES OF ZINC PHTHALOCYANINE THIN FILMS, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 6, pp. 3127-3134 (2005)