Nanometer fabrication techniques for wide-gap II-VI semiconductors and their optical characterization |
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Authors: | CMSotomayor Torres A P Smart M Watt M A Foad K Tsutsui C D W Wilkinson |
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Affiliation: | (1) Nanoelectronics Research CentreDepartment of Electronics and Electrical Engineering, University of Glasgow, G12 8LT Glasgow, Britain;(2) Present address: Ministry of Defence, Main Building, Whitehall, SW1A 2HB London, Britain;(3) Present address: Department of Electronics and Electrical Engineering, Univ. of Salford, M5 4WT Salford, Britain;(4) Present address: Department of Applied Electronics, To- kyo Institute of Technology, 4259 Nagatsuda, Midoriku, 227 Yokohama, Japan |
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Abstract: | We have fabricated dots and wires down to 30 nm diameter and 60 nm width in ZnTe/GaAs and ZnSe/GaAs. The fabrication process
relies on electron beam lithography and dry etching using a mixture of CH4/H2. We have extensively characterized the flat etched surfaces of both ZnTe and ZnSe using x-ray photoelectron spectroscopy
(XPS), Raman scattering, and luminescence spectroscopy. Flat etched samples were also annealed. We found that improvements
in the emission spectrum were related probably to defect removal in the asgrown samples and had a secondary impact in the
etched and annealed samples. From XPS data, some evidence is found of zinc desorption from the surface, which is later corroborated
by Raman scattering in etched wires with the appearance of tellurium modes. The luminescence spectra of flat etched samples
show no major changes in the spectral lines, with a hint of a change in relative concentration in donors and acceptors and
evidence of ZnTe/GaAs intermixing closer to the interface. No line broadening is observed and the emission intensity is retained.
The emission and Raman scattering spectra of etched wires and dots confirms that negligible fabrication damage is incurred
as well as the absence of further strain or strain release after etching. |
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Keywords: | Dry etching Luminescence Nanolithography Nanostructures Raman scattering X-ray photoelectron spectroscopy (XPS) ZnSe ZnTe |
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