BLUESHIFT AND INTENSITY ENHANCEMENT IN VISIBLE EMISSION SPECTRUM OFC-AXIS ORIENTED SPRAY PYROLYTICALLY GROWN NANOCRYSTALLINEZnOTHIN FILMS

M. Junaid Bushiri (), V. Gopakumar and V. K. Vaidyan
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M. Junaid Bushiri: Department of Physics, Cochin University of Science and Technology, Kochi 682022, Kerala, India
V. Gopakumar: Department of Physics, University of Kerala, Thiruvananthapuram, 695581, Kerala, India
V. K. Vaidyan: Department of Physics, University of Kerala, Thiruvananthapuram, 695581, Kerala, India

Surface Review and Letters (SRL), 2008, vol. 15, issue 05, 551-556

Abstract: Highly (002)-oriented nanocrystallineZnOthin films were deposited on glass substrates at a substrate temperature of 500°C in air atmosphere by low-cost spray pyrolysis method. Room temperature photoluminescence spectral studies show the presence of near band edge emission and defect level emission (DLE) from the samples. The DLE wavelength is blueshifted about 22 nm and further emission intensity enhancement is observed in (002)-oriented sample as compared to that of wurtziteZnOphase. The modifications in local defect levels and change in crystalline symmetry are attributed to the blue shift in the DLE region ofc-axis oriented sample. The increased emission intensity of (002)-oriented samples is due to improvement in crystalline quality, preferential oriented growth and spherical morphology of nanocrystalline grains.

Keywords: Zinc oxide; semiconductor; spray pyrolysis; photoluminescence; c-axis orientedZnO (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X08011706

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