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Structural and optical properties of nano scale BaTiO3 thin films prepared from BaTiO3 nanoparticles synthesised by organic acid precursor method

R.SENGODAN1,* , B.CHANDAR SHEKAR2, S.SATHISH2

Affiliation

  1. Department of Physics, Kumaraguru College of Technology, Coimbatore, Tamil Nadu. India
  2. Departments of Physics, Kongunadu Arts and Science College, G.N- Mills, Coimbatore, Tamil Nadu, India

Abstract

BaTiO3 nanoparticles prepared by organic acid precursor method were thermally evaporated onto a well cleaned glass substrate under a vacuum of 2 x 10-5 Torr, using a Hindu High vacuum coating unit. Nano thin films of BaTiO3 were prepared on well cleaned glass plates for the first time by vacuum evaporation method. The thickness of the coated films was measured by using quartz crystal thickness monitor. Energy dispersive Spectrum (EDS) were used to identify the composition of the nano powders and films. X- ray diffraction (XRD) spectrum indicated that the powder has tetragonal structure whereas the film was predominantly amorphous. Surface morphology of the powders and coated films were studied by scanning electron microscope (SEM). No pits and pin holes were found in the surface. As grown films showed smooth and compact structure. Optical properties were studied by using UV- Visible spectrophotometer. The band gap of the films were found to be 3.6eV to 3.75eV.It was found to be indirect allowed transition and decrease little with the increase of thickness. The extinction coefficient and absorption coefficient also reported. The observed smooth surface without any pinholes, pits and dendritic features and high band gap energy value indicated that the vacuum evaporated nano scale films could be used as dielectric layer in thin film transistor..

Keywords

BaTiO3, Thermal evaporation, EDS, XRD, SEM, UV – Visible.

Submitted at: May 9, 2012
Accepted at: July 19, 2012

Citation

R.SENGODAN, B.CHANDAR SHEKAR, S.SATHISH, Structural and optical properties of nano scale BaTiO3 thin films prepared from BaTiO3 nanoparticles synthesised by organic acid precursor method, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 7-8, pp. 653-657 (2012)