Optical and Electrical Characterizations of ZnMnO Thin Films on $c$-Al2O3

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概要

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• We have studied the manganese (Mn) composition dependence of the optical and electrical properties of ZnMnO thin films, which are grown on $c$-Al2O3 substrates by plasma-assisted molecular beam epitaxy (PAMBE). The lattice constant and grain size are estimated by X-ray diffraction (XRD), and it is found that the lattice constant increases and the grain size decreases with increasing Mn composition. When more Mn is incorporated into the ZnMnO thin films, a blue shift of the absorption edges and photoluminescence emission peaks are observed. Hall measurement shows n-type conduction behavior for all the samples. The decrease in mobility might be related with the increase in the number of impurity scattering centers, and the decrease in the carrier concentration can be attributed to the carrier quenching effect induced by the deep-level defects. The ac electrical response of ZnMnO is studied by impedance spectroscopy (IS). The equivalent RC circuit and parameters of the grain and grain boundary are determined.

• 2009-04-25

著者

• Wu Jenq-Shinn

  Department of Electronics Engineering & Institute of Electronics, National Chiao Tung Uiversity

• Chou Wu-ching

  Institute And Department Of Electrophysics National Chiao-tung University

• WANG Jyh-Shyang

  Department of Physics, Chung Yuan Christian University

• Lin Der-yuh

  Department Of Electronic Engineering National Changhua University Of Education

• Yang Chu-Shou

  Graduate Institute in Electro-Optical Engineering, Tatung University, 40 Jhongshan North Road, 3rd Section, Taipei 104, Taiwan

• Lin Hung-Ji

  Department of Electronic Engineering, National Changhua University of Education, 1 Jin De Road, Paisha Village, Changhua 500, Taiwan

• Lo Wei-Hsuan

  Department of Physics and Center of Nanotechnology, Chung-Yuan Christian University, 200 Chung Pei Road, Chungli 320, Taiwan

• Wang Jyh-Shyang

  Department of Physics and Center of Nanotechnology, Chung-Yuan Christian University, 200 Chung Pei Road, Chungli 320, Taiwan

• Chou Wu-Ching

  Institute and Department of Electrophysics, National Chiao-Tung University, 1001 Ta Hsueh Road, Hsinchu 300, Taiwan

• Wu Jenq-Shinn

  Department of Electronic Engineering, National Changhua University of Education, 1 Jin De Road, Paisha Village, Changhua 500, Taiwan

• Lin Der-Yuh

  Department of Electronic Engineering, National Changhua University of Education, 1 Jin De Road, Paisha Village, Changhua 500, Taiwan

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