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Advances in Condensed Matter Physics
Volume 2012, Article ID 763209, 5 pages
http://dx.doi.org/10.1155/2012/763209
Research Article

Structural, Electrical, and Optical Properties of PbTe Thin Films Prepared by Simple Flash Evaporation Method

PG and Research Department of Physics, Kongunadu Arts and Science College, Tamilnadu Coimbatore 641 029, India

Received 28 March 2012; Accepted 18 July 2012

Academic Editor: Victor V. Moshchalkov

Copyright © 2012 Lakshmanan Kungumadevi and Ramakrishnan Sathyamoorthy. 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

Lead telluride (PbTe) films have been prepared on glass substrates by flash evaporation method. Structure of the film is found to possess stable face-centered cubic (fcc) NaCl phase in which the grains predominantly grow in the direction of (200) plane. The calculated grain size was in the range 19 nm. The electrical resistivity as a function of temperature was measured using four-probe technique. The electrical conductivity was calculated, and the value is found to be from 67.11 to 344.82 S/cm in the temperature range 303–453 K. The value of mobility was evaluated, and it is found to be 0.329×10-3 cm2·V1 S1. An optical study reveals that the PbTe thin films exhibit large blue shift. The optical constants such as absorption coefficient and refractive index have been estimated, and the results are discussed.