Effect of substrate temperature on optical and electrical properties of CdZnSeTe thin films prepared by spray pyrolysis technique
International Journal of Development Research
Effect of substrate temperature on optical and electrical properties of CdZnSeTe thin films prepared by spray pyrolysis technique
Received 16th September, 2017; Received in revised form 21st October, 2017; Accepted 09th November, 2017; Published online 29th December, 2017
Copyright ©2017, Gaikwad et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Polycrystalline semiconducting chalcogenide thin films of CdZnSeTe are prepared on large area of glass substrate by spray pyrolysis technique. Thin films of CdZnSeTe deposited at different substrate temperatures 250°C, 275°C, 300°C and 325°C were investigated. Absorption coefficients for the films were evaluated from optical transmission spectra in the wavelength range 350nm-1100nm.Composition was confirmed from EDAX while SEM pictures shows the presence of nanotubes. Graphs plotted between (αhν)2 and(hν) yields straight lines indicating direct transition with optical band gap energies in the range 2.40eV- 2.44 eV. Optical properties such as extinction coefficient, refractive index and dielectric constant have been evaluated in wavelength range 350nm-1100nm. Electrical study was carried out by four probe method. Arrhenius behavior shows semiconducting nature of the films Values obtained by this method are found to be suitable to use the thin films for many scientific and technical applications such as solar cells, heat mirrors detectors etc.
