STRUCTURAL AND OPTICAL PROPERTIES OF LARGE-SCALEZnONANOWIRES AND NANOSHEETS PREPARED BY DRY THERMAL OXIDATION

S. S. Tneh, H. Abu Hassan, K. G. Saw (), F. K. Yam and Z. Hassan
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S. S. Tneh: Nano-Optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, 11800 Penang, Malaysia
H. Abu Hassan: Nano-Optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, 11800 Penang, Malaysia
K. G. Saw: Physics Section, School of Distance Education, Universiti Sains Malaysia, Minden, 11800 Penang, Malaysia
F. K. Yam: Nano-Optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, 11800 Penang, Malaysia
Z. Hassan: Nano-Optoelectronics Research Laboratory, Universiti Sains Malaysia, Minden, 11800 Penang, Malaysia

Surface Review and Letters (SRL), 2009, vol. 16, issue 06, 901-904

Abstract: In this work, we report the morphology and optical properties of zinc oxide(ZnO)layers prepared by dry thermal oxidation at different annealing conditions. Morphology studies using scanning electron microscope (SEM) show that the amount of nanowires and nanosheets increases with the introduction of a flow ofO2gas. High-resolution X-ray diffraction (HR-XRD) data show that typical polycrystallineZnOnanostructure layers have been deposited. Near-perfect stoichiometry ofZnandOatom vacancies has been observed from energy dispersion spectroscopy (EDS) spectrum. Photoluminescence (PL) spectra show strong peaks at UV and green regions. An increase in the stoichiometry ofZnOhas been achieved with the oxygen gas flow during annealing indicating that deep-level defects represented by interstitial oxygen and antisite oxygen are gas pressure dependent. A single exciton peak with binding energy 60 meV has been observed at room temperature.

Keywords: Excitons binding energy; nanosheet; nanowire; PL; ZnO (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09013451

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