Lattice vibrational properties of ZnMgO grown by pulsed laser deposition

被引：17
|
作者：
Belogorokhov, A. I.
Polyakov, A. Y.
Smirnov, N. B.
Govorkov, A. V.
Kozhukhova, E. A.
Kim, H. S.
Norton, D. P.
Pearton, S. J.
机构：
[1] Inst Rare Met, Moscow 119017, Russia
[2] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA
来源：
APPLIED PHYSICS LETTERS | 2007年 / 90卷 / 19期
基金：
美国国家科学基金会; 俄罗斯基础研究基金会;
关键词：
D O I：
10.1063/1.2738196
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Vibrational modes were studied in n-type and p-type ZnMgO films doped with P (Mg composition of 7 at. %) grown by pulsed laser deposition on sapphire. The characteristic phonon frequencies were deduced from the analysis of IR reflectance measured by Fourier-transform spectroscopy. From comparison with similarly grown ZnO (P) films, Mg incorporation reduced the frequency of TO phonons by 14.5 cm(-1) and introduced two Mg related modes near 530 and 969 cm(-1). The first is likely to belong to the local vibrational mode of substitutional Mg, and the second is tentatively attributed to strongly lattice relaxed off-center Mg atoms. In addition, it was found that Mg incorporation triggers the formation of two phonon bands with characteristic frequencies of 501 and 634 cm(-1) that most likely belong to lattice defects. (C) 2007 American Institute of Physics.
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