FPLAPW study of the structural, electronic, and optical properties of Ga2O3: Monoclinic and hexagonal phases

被引:69
作者
Litimein, F. [1 ]
Rached, D. [1 ]
Khenata, R. [2 ]
Baltache, H. [2 ]
机构
[1] Univ Djillali Liabes Sidi Bel Abbes, Lab Mat Magnet, Dept Phys, Fac Sci, Sidi Bel Abbes 22000, Algeria
[2] Ctr Univ Mascara, LPQ3M, Mascara 29000, Algeria
关键词
FPLAPW; Electronic properties; Optical properties; High pressure; THIN-FILMS; BETA-GA2O3; OXIDE; GROWTH; CONDUCTION; NANOWIRES; CRYSTALS;
D O I
10.1016/j.jallcom.2009.08.092
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Using the first principles full-potential linearized augmented plane-wave method within the local density approximation, we have studied the structural, electronic and optical properties of Ga2O3 in its ambient, monoclinic (beta)and high-pressure hexagonal (alpha) phases. It is found the both beta-Ga2O3 and alpha-Ga2O3 have an indirect band gap. The conduction band minimum (CBM) is located at Gamma point for both phases, whereas the valence band maximum (VBM) is located at the M point for beta-Ga2O3 and at L point for alpha-Ga2O3. The calculated total and partial density of states are also presented. The analysis of the electron charge density shows that the Ga-O bonds have significant ionic character. The anisotropic optical properties are investigated by means of the complex dielectric function, which are explained by the selection rule of the band-to-band transitions. For the monoclinic phase, it is shown that the component with y-direction are more pronounced than that along the x and z. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:148 / 156
页数:9
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