Infrared optical properties of MgxZn1-xO thin films (0&lex&le1): Long-wavelength optical phonons and dielectric constants

被引：0
|
作者：
Bundesmann, C. [1 ,4 ]
Rahm, A. [1 ]
Lorenz, M. [1 ]
Grundmann, M. [1 ]
Schubert, M. [1 ,2 ,3 ]
机构：
[1] Institut für Experimentelle Physik II, Universität Leipzig, Linństrasse 5, D-04103 Leipzig, Germany
[2] Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0511
[3] Center for Materials Research and Analysis, University of Nebraska-Lincoln, Lincoln, NE 68588-0511
[4] Leibniz-Institut für Oberflächenmodifizierung e.V., Permoserstraße 15, D-04303 Leipzig, Germany
来源：
Journal of Applied Physics | 2006年 / 99卷 / 11期
关键词：
Infrared spectroscopic ellipsometry in the spectral range from ω=360 cm-1 to ω=1500 cm-1 and Raman scattering spectroscopy are applied to study the long-wavelength optical phonon modes and dielectric constants of Mgx Zn1-x O thin films in the composition range 0&lex&le1. The samples were grown by pulsed laser deposition on sapphire substrates. X-ray diffraction measurements of the thin film samples reveal the hexagonal wurtzite crystal structure for x&le0.53 and the cubic rocksalt crystal structure for x0.67. A systematic variation of the phonon mode frequencies with Mg-mole fraction x is found for both hexagonal and cubic Mgx Zn1-x O thin films. The modified random isodisplacement model matches the observed composition dependence of the phonon mode frequencies for the hexagonal structure thin films [J. Chen and W. Z. Shen; Appl; Phys; Lett; 83; 2154; (2003); whereas a simple linear approximation scheme is sufficient for the cubic structure part. We observe a discontinuous behavior of the transverse optical phonon modes (decrease); and the static and high-frequency dielectric constants (increase) within the phase transition composition region from the wurtzite structure part to the rocksalt structure part. On the contrary; the longitudinal phonon mode parameters increase almost linearly; and upon phase transition the splitting between the transverse and longitudinal modes increases. We associate this discontinuous behavior with the change of the nearest-neighbor coordination number from fourfold (wurtzite structure) to sixfold (rocksalt structure) in our samples and the associated increase in bond ionicity from ZnO to MgO. Accordingly; we propose that the reduced exciton mass parameter should approximately double upon changing from wurtzite to rocksalt crystal structure. © 2006 American Institute of Physics;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Journal article (JA)
引用
收藏
相关论文
共 50 条
  • [1] Infrared optical properties of MgxZn1-xO thin films (0 ≤ x ≤ 1):: Long-wavelength optical phonons and dielectric constants
    Bundesmann, C.
    Rahm, A.
    Lorenz, M.
    Grundmann, M.
    Schubert, M.
    JOURNAL OF APPLIED PHYSICS, 2006, 99 (11)
  • [2] The optical properties of MgxZn1-xO thin films
    Zhang Xi-Jian
    Ma Hong-Lei
    Li Yu-Xiang
    Wang Qing-Pu
    Ma Jin
    Zong Fu-Jian
    Xiao Hong-Di
    CHINESE PHYSICS, 2006, 15 (10): : 2385 - 2388
  • [3] Fabrication and optical properties of MgxZn1-xO thin films
    Zhang Xi-Jian
    Yuan Hui-Min
    Wang Qing-Pu
    Wang Tong
    Ma Hong-Lei
    CHINESE PHYSICS B, 2010, 19 (01)
  • [4] Fabrication and optical properties of MgxZn1-xO thin films
    张锡健
    袁慧敏
    王卿璞
    王统
    马洪磊
    Chinese Physics B, 2010, (01) : 524 - 526
  • [5] Structural and optical properties of hexagonal MgxZn1-xO thin films
    Jin, Chunming
    Narayan, Roger J.
    JOURNAL OF ELECTRONIC MATERIALS, 2006, 35 (05) : 869 - 876
  • [6] Structural and optical properties of magnetron sputtered MgxZn1-xO thin films
    Kumar, Sanjeev
    Gupte, Vinay
    Sreenivas, K.
    JOURNAL OF PHYSICS-CONDENSED MATTER, 2006, 18 (13) : 3343 - 3354
  • [7] Cubic phase MgxZn1-xO thin films for optical waveguides
    Yu, P.
    Wu, H. Z.
    Xu, T. N.
    Qiu, D. J.
    Hu, G. J.
    Dai, N.
    JOURNAL OF CRYSTAL GROWTH, 2008, 310 (02) : 336 - 340
  • [8] Structural and optical properties of MgxZn1-xO thin films deposited by magnetron sputtering
    Zhang, XJ
    Ma, HL
    Wang, QP
    Ma, J
    Zong, FJ
    Xiao, H
    Ji, F
    Hou, SJ
    PHYSICA B-CONDENSED MATTER, 2005, 364 (1-4) : 157 - 161
  • [9] The effect of growth ambient on the structural and optical properties of MgxZn1-xO thin films
    Ghosh, R.
    Basak, D.
    APPLIED SURFACE SCIENCE, 2009, 255 (16) : 7238 - 7242
  • [10] Band-to-band transitions and optical properties of MgxZn1-xO(0 ≤ x ≤ 1) films
    Schmidt-Grund, R
    Fritsch, D
    Schubert, M
    Rheinländer, B
    Schmidt, H
    Hochmut, H
    Lorenz, M
    Spemann, D
    Herzinge, CM
    Grundmann, M
    PHYSICS OF SEMICONDUCTORS, PTS A AND B, 2005, 772 : 201 - 202
12345