Electrical Properties of Pure and Doped (KNO3 & MgCl2) Polyvinyl Alcohol Polymer Thin Films

Abstract

Polymer thin films find wide range of technological applications such as coatings, adhesives, lithography, sensors and as solid state electrochemical cells they can be directly deposited on to chips in any shape or size. In the present work pure and doped (KNO3 & MgCl2) polyvinyl alcohol thin films were synthesized using solution-casting method. The optical absorption spectra of synthesized thin films were recorded at room temperature over a wavelength range of 200-800 nm using JASCO spectrophotometer Model V-570. From the spectral data the optical constants such as band edge, optical band gap (both direct and indirect) were determined. The variation of optical band gap on doping is explained on the basis of incorporation of charge transfer complexes (CTCs) by the dopants. The absorption studies have led to a variety of interesting thin film optical phenomenon, which have thrown considerable light on the band structure of solids and phonic states.