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Titolo:
Electronic band structure of quaternary Be-chalcogenides, studied by ultraviolet ellipsometry and photoreflectance spectroscopy
Autore:
Wagner, V; Fleszar, A; Geurts, J; Reuscher, G; Keim, M; Waag, A; Landwehr, G; Wilmers, K; Esser, N; Richter, W;
Indirizzi:
Univ Wurzburg, Inst Phys, D-97074 Wurzburg, Germany Univ Wurzburg Wurzburg Germany D-97074 t Phys, D-97074 Wurzburg, Germany Univ Wurzburg, Inst Theoret Phys, D-97074 Wurzburg, Germany Univ WurzburgWurzburg Germany D-97074 t Phys, D-97074 Wurzburg, Germany Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany Tech Univ Berlin Berlin Germany D-10623 perphys, D-10623 Berlin, Germany
Titolo Testata:
JOURNAL OF CRYSTAL GROWTH
, volume: 214, anno: 2000,
pagine: 340 - 344
SICI:
0022-0248(200006)214:<340:EBSOQB>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZNSE;
Keywords:
BeMgZnSe; VUV-ellipsometry; photoreflectance; beryllium;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Wagner, V Univ Wurzburg, Inst Phys, Hubland, D-97074 Wurzburg, Germany Univ Wurzburg Hubland Wurzburg Germany D-97074 urzburg, Germany
Citazione:
V. Wagner et al., "Electronic band structure of quaternary Be-chalcogenides, studied by ultraviolet ellipsometry and photoreflectance spectroscopy", J CRYST GR, 214, 2000, pp. 340-344

Abstract

Beryllium chalcogenides are a new class of II-VI materials and promising candidates for UV/VIS applications. In this paper we analyse the optical properties of the quaternary BeMgZnSe system lattice matched to GaAs. We investigate the compositional dependence of the fundamental and higher energy gaps (E-0, E-1, E-2). The investigations are performed (a) experimentally by photoreflectance and by ellipsometry up to 9.5 eV and (b) theoretically by first principles band structure calculations within the virtual crystal approximation (VCA). The fundamental energy gap is found to vary from 2.7eV for ZnSe to 3.7eV for a (Be,Mg)-content of 70%. The VCA calculations predict the correct overall gap dependencies. Especially, a negative bowing of the E-0 gap is predicted by the VCA model. This unusual behaviour may be explained by the absence of bond length redistribution dynamics in this lattice matched system. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/21 alle ore 14:49:37