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Journal of Atomic and Molecular Physics
Volume 2014 (2014), Article ID 125843, 9 pages
http://dx.doi.org/10.1155/2014/125843
Research Article

Optical Emission Spectroscopic Analysis of Plasma Plume during Pulsed Laser Deposition of PZT

1Nanophotonic and Opto Electronic Devices Lab, Department of Physics, Cochin University of Science and Technology, Cochin, Kerala 682022, India
2Department of Physics, UC College, Aluva, Kerala 683102, India
3Department of Physics, St. Pauls College, Kalamasserry, Kerala 682022, India

Received 23 October 2013; Revised 3 January 2014; Accepted 4 January 2014; Published 13 February 2014

Academic Editor: Keli Han

Copyright © 2014 S. Sasanka Kumar 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.

Abstract

Spatial variation in intensity of spectral emission, electron temperature, number density, and the time of flight (TOF) of ions and neutrals at various oxygen ambiances has been investigated on ferroelectric lead zirconium titanate (PZT) plasma using optical emission spectroscopy. Plasma produced by ablating PZT ceramic target using Nd-YAG laser operating at the third harmonics (  nm,  ns, repetition frequency 10 Hz) was investigated at various oxygen partial pressures and at various distances from the target surface. Here energy density for laser fluence was fixed as 3.13 Jcm−2 and distance from the target and ambient gas pressure were varied. The electron number density and electron temperature of the PZT plasma at the early stage of plume expansion were measured as  Jcm−2 and 13200 K, respectively, and thus verified the existence of local thermodynamic equilibrium (LTE). Time of flight spectra (TOF) of neutral and singly ionized species in plasma were recorded. The result shows that plasma parameters and velocity of species are of same order for various oxygen partial pressures but have a decreasing tendency with distance. The energy of almost all species in the plume become more or less same at 0.1 mbar. These conditions favour the growth of perovskite PZT thin films.