Blue Shift of Optical Band Gap in ZnO Thin Film Grown by Spin Coating Process

[Santhosh Prabhu,Dr. Dhananjaya Kekuda] Volume 1: Issue 2, April 2014

Abstract:-
Optical band gap of ZnO thin films deposited on glass substrate by spin coating process was studied. The optical band gap of as-grown ZnO blue shifted from 3.11eV to 3.69 eV as the annealing temperature decreased from 300 to 100 °C. Also observed that there is a variation in the transmittance of ZnO thin film. X-ray diffraction measurements showed that samples deposited at 1000C, 2000C and 3000C consisted of amorphous phases without any prominent diffraction peaks. The AFM images showed that there is a decrease in the grain size, which is the evidence for the decrease in the transmittance.
Index Terms:-
Spin coating, UV-visible, XRD, AFM, Optical properties.
REFERENCES
[1] S. T. Tan et al “Blue shift of optical band gap in ZnO thin films grown by metal-organic chemical-vapor deposition” S. T. Tan et al; School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore .
[2] J. Tauc, Amorphous and Liquid Semiconductors Plenum, London, 1974.
[3]J. G. Lu, Z. Z. Ye, L. Wang, J. Y. Huang, and B. H. Zhao, “Mater. Sci. Semiconductor Process” 2003.
[4] Somnath C. Roy, G.L. Sharma and M.C. Bhatnagar “ Large blue shift in the optical band-gap of sol–gel derived Ba0.5Sr0.5TiO3 thin films” Volume 141, Issue 5, February 2007.
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