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Optical properties of polycarbonate organic matrix/cadmium sulphide clusters composite material

A. STANCULESCU1,* , F. STANCULESCU2, M. SOCOL1

Affiliation

  1. National Institute for Material Physics, P.O. Box MG 7 Magurele, Bucharest, Romania
  2. Faculty of Physics, University of Bucharest, Romania

Abstract

This paper presents the investigation of the optical properties of bisphenol A polycarbonate organic matrix/CdS clusters composite material in correlation with the method for the films’ preparation using as precursors cadmium acetate (Cd(CH3COO)2), respectively ammonium thiocyanate (NH4CNS), and as general solvent for all the components, is dimethyformamide. The effect of the heat treatment temperature (90 oC or 150 oC) on the position and shape of the fundamental absorption edge was investigated for given substrate, drying conditions and duration (1.5 h or 0.5 h) of the heat treatment. A large blue shift of the absorption edge was evidenced in films prepared in vertical configuration and thermally treated at 90 oC for 1.5 h, which can be associated with a small dimension of the CdS crystallites and in consequence with quantum confinement effects. Using the effective mass theory we have deduced a crystallite dimension in the range 8.8-15 nm. We also have studied the interaction of the light with this composite material evaluating an optical band gap between 2.92 and 3.69 eV (depending on the preparation and annealing conditions) and an absorption mechanism in CdS clusters closer to an indirect transition and deviated from the normal direct absorption process in bulk CdS semiconductor..

Keywords

Organic/inorganic composite, Polymeric matrix, II-VI semiconductor compounds, Light absorption.

Submitted at: March 15, 2006
Accepted at: May 18, 2006

Citation

A. STANCULESCU, F. STANCULESCU, M. SOCOL, Optical properties of polycarbonate organic matrix/cadmium sulphide clusters composite material, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1057-1061 (2006)