English  |  正體中文  |  简体中文  |  Items with full text/Total items : 27314/39158
Visitors : 2473339      Online Users : 112
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/28575

Title: Optical characterization of Cd1−x−yBexZnySe mixed crystals
Authors: J. Z. Wang;P. J. Huang;H. P. Hsu;Y. S. Huang;F. Firszt;S. Łęgowski;H. Męczyńska;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: cadmium compounds;beryllium compounds;zinc compounds;II-VI semiconductors;wide band gap semiconductors;photoluminescence;electroreflectance;surface photovoltage;surface states;polishing;etching;excitons;electron-hole recombination;deep levels;spin-orbit interactions
Date: 2007
Issue Date: 2011-10-21T02:38:13Z
Publisher: Journal of Applied Physics
Abstract: Abstract:A detailed optical characterization of a series of wurtzite-type Cd1−x−yBexZnySe mixed crystals grown by the modified high pressure Bridgman method has been carried out via photoluminescence (PL) and contactless electroreflectance (CER) in the temperature range of 15–300 K. Room temperature surface photovoltage spectroscopy has been used as a diagnostic technique for checking the surface condition of the sample. For the mechanically polished sample, the surface photovoltage spectrum at room temperature recorded a below band edge broad feature which is most likely related to the surface states induced by mechanical defect. This feature can be eliminated via mechanical polishing and followed by chemical etching, and hence, only the exciton line was observed for the damage-removed sample. Typical PL spectrum at low temperature consists of an exciton line, an edge emission due to recombination of shallow donor-acceptor pairs, and a broadband related to recombination through deep level defects. Various interband transitions, originating from the band edge and spin-orbit splitting critical points, of the samples have been observed in the CER spectra. Comparison of PL and CER data for the Cd1−x−yBexZnySe samples shows that for a low Zn and Be content the peak positions of the excitonic emission lines in the PL spectra correspond quite well to the transition energies of the A exciton from the CER data. For samples with higher Be and Zn contents, the results indicate that localization of excitons has taken place at low temperatures. The parameters that describe the temperature dependence of the transition energy and broadening parameter of the fundamental band edge exciton have been evaluated and discussed.
Relation: 101(10), pp.3539
URI: http://ntour.ntou.edu.tw/handle/987654321/28575
Appears in Collections:[電機工程學系] 期刊論文

Files in This Item:

File Description SizeFormat
index.html0KbHTML320View/Open


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