English  |  正體中文  |  简体中文  |  Items with full text/Total items : 28611/40649
Visitors : 613542      Online Users : 70
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

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
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

Files in This Item:

File Description SizeFormat

All items in NTOUR are protected by copyright, with all rights reserved.


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback