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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/1239

Title: High optical quality ZnO epilayers grown on sapphire substrates by reactive magnetron sputtering of zinc target
Authors: SINGH, SUKHVINDER
RAVI KUMAR
GANGULI, TAPAS
SRINIVASA, RS
MAJOR, SS
Keywords: x-ray diffraction
zinc compounds
dislocation density
crystallites
Issue Date: 2008
Publisher: Elsevier
Citation: Journal of Crystal Growth 310(22), 4640-4646
Abstract: Zinc oxide (ZnO) epilayers were grown on (0 0 0 1) sapphire substrates by reactive sputtering of a zinc target at substrate temperatures of 300 and 600 °C. High-resolution X-ray diffraction, UV–visible and photoluminescence (PL) measurements were carried out to obtain information about epitaxy, micro-structure and optically active defects in these epilayers. Though the epilayer deposited at 600 °C showed a slightly smaller crystallite size along the growth direction as compared to that deposited at 300 °C, it was much superior in terms of other micro-structural parameters. It exhibited significantly small values of micro-strain (2×10−4), rocking curve width (~0.13°), mosaic twist (0.35°), and screw (6.6×108 cm−2)- and edge (2.9×1011 cm−2)-type dislocation densities. Absorption and PL studies showed the high optical quality of the ZnO epilayer deposited at 600 °C, which exhibited a narrow (full-width at half-maximum—FWHM~96 meV) and intense band edge luminescence at room temperature. The micro-structural parameters and the sharp PL peak show that the reactively sputtered ZnO epilayer grown at 600 °C is comparable in epitaxial and optical quality with ZnO grown by other epitaxial processes.
URI: 10.1016/j.jcrysgro.2008.08.055
http://hdl.handle.net/10054/1239
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1239
ISSN: 0022-0248
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