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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/28576

Title: Optical characterization of Zn0.96Be0.04Se and Zn0.93Mg0.07Se mixed crystals
Authors: H. P. Hsu;P. J. Huang;C. T. Huang;Y. S. Huang;F. Firszt;S. Łęgowski;H. Męczyńska;K. Strzałkowski;A. Marasek;K. K. Tiong
Contributors: NTOU:Department of Electrical Engineering
國立臺灣海洋大學:電機工程學系
Keywords: beryllium compounds;deep levels;energy gap;excitons;II-VI semiconductors;magnesium compounds;optical materials;photoluminescence;photoreflectance;zinc compounds
Date: 2008
Issue Date: 2011-10-21T02:38:13Z
Publisher: Journal of Applied Physics
Abstract: Abstract:A detailed optical characterization of Zn0.96Be0.04Se and Zn0.93Mg0.07Se mixed crystal samples grown by the modified high-pressure Bridgman method has been carried out via photoluminescence (PL), contactless electroreflectance (CER), and photoreflectance (PR) in the temperature range of 15–400 K. With these optical diagnostic tools we observed features originating from exciton emission, an edge emission due to recombination of shallow donor-acceptor pairs (DAPs), and a broad band related to recombination through deep-level defects, as well as band-edge and spin-orbit splitting critical points interband transitions in CER and PR experiments. The optical properties of these two mixed crystals are compared. Our comparative study revealed that the beneficial effect of beryllium (Be) incorporation is superior to that of magnesium (Mg), in the sense that a Be-containing ternary alloy resulted in better crystalline quality with more intense excitonic emission line and weaker DAPs and deep-level defect-related bands. The peak positions of the excitonic emission lines in the PL spectra correspond quite well to the energies of the fundamental transitions obtained by means of electromodulation spectra. The parameters that describe the temperature dependence of the fundamental and spin split-off band gaps, and the broadening function of the band-edge excitons, are evaluated and discussed.
Relation: 103(1), pp.3501-3506
URI: http://ntour.ntou.edu.tw/handle/987654321/28576
Appears in Collections:[電機工程學系] 期刊論文

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