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Structural and optical characterization of dip coated PbS nanostructured films prepared at different reaction temperature

M. ABDEL RAFEA1,* , N. ROUSHDY1

Affiliation

  1. Electronic Materials Dep., Advanced Technologies and New Materials Institute Mubarak City for Scientific Research and Technology Applications P.O. Box 21934 New Borg El-Arab, Alexandria, Egypt

Abstract

PbS thin films were deposited by dip coating technique from lead acetate and thiourea in the reaction temperature range 100-200 oC. Nano structured PbS cubic phase was identified by XRD. Crystallite size of 4.8 nm was observed at lower reaction temperature and increased to 5.5 nm as the reaction temperature increases or by annealing at the same reaction temperature. Nano grains in the range 30-70 nm was observed by SEM. EDX analysis shows that the films composition are close to stiochiometric value for all deposited films. Optical absorption and dispersion were deduced from the transmittance curve only for films deposited with different thicknesses. Mathematical treatment was applied to calculate the optical parameters α, Eg, n and K. The absorption edge was shifted towards the visible region due to band gap increase due to strong confinement effect in nano structured system..

Keywords

PbS, nanostructured films, Dip coating, structural and Optical Properties.

Submitted at: May 19, 2009
Accepted at: July 23, 2009

Citation

M. ABDEL RAFEA, N. ROUSHDY, Structural and optical characterization of dip coated PbS nanostructured films prepared at different reaction temperature, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 7, pp. 929-934 (2009)