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Electrical and optical properties of some polyazomethine thin films prepared by a spin-coating method

A. AMIRONESEI1, A. AIRINEI2, D. TIMPU2, V. COZAN2, A. P. RAMBU1, M. IRIMIA1, F. IACOMI1,* , G. I. RUSU1

Affiliation

  1. Department of Physics,”Al. I. Cuza” University, 11, Carol I Blvd, 700536, Iasi, Romania
  2. “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, nr. 41A, 700487 Iasi, Romania, Iasi, Romania

Abstract

Three types of polymers containing azomethine units linked by ether bond, sulfone and bisfenols, were prepared, dissolved in dimethylformamide and deposited on glass slides by spin coating. The obtained transparent thin films exhibit an amorphous structure with morphology dependent on chemical structure. The study of optical absorption evidenced large direct band gaps. The sulfone presence induces an increase in the thin film band gap energy and a decrease in Urbach energy and low-energy absorption coefficient. The temperature dependence of the electrical conductivity showed that thin films have semiconducting properties with two distinct sections. The mechanism of electronic transport is described. The values of the energy band gap determined from absorption spectra were in good agreement with those calculated from the temperature dependence of the electrical conductivity. In the low temperature range, the temperature dependence of the electrical conductivity was described by the Mott variable range hopping model..

Keywords

: Polymers; Thin films, Electrical properties, Optical properties.

Submitted at: July 4, 2011
Accepted at: July 25, 2011

Citation

A. AMIRONESEI, A. AIRINEI, D. TIMPU, V. COZAN, A. P. RAMBU, M. IRIMIA, F. IACOMI, G. I. RUSU, Electrical and optical properties of some polyazomethine thin films prepared by a spin-coating method, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 7, pp. 802-806 (2011)