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Preparation of a Non-Polar ZnO Film on a Single-Crystal NdGaO3 Substrate by the RF Sputtering Method

  • Topical Collection: 18th International Conference on II-VI Compounds
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Abstract

Preparation of non-polar ZnO (\( 11\overline{2} 0 \)) films on single-crystal NdGaO3 (NGO) (001) substrates was successfully achieved by the radio frequency (RF) sputtering method. Orientation, deposition rate, and surface roughness of ZnO films strongly depend on the working pressure. Characteristics of ZnO films deposited on single-crystal NGO (001) substrates were compared with those of ZnO films deposited on single-crystal sapphire (\( 01\overline{1} 2 \)) substrates. An x-ray diffraction peak of the ZnO (\( 11\overline{2} 0 \)) plane was observed on ZnO films deposited on single-crystal NGO (001) substrates under working pressure of less than 0.5 Pa. On the other hand, uniaxially oriented ZnO (\( 11\overline{2} 0 \)) films on single-crystal sapphire (\( 01\overline{1} 2 \)) substrates were observed under working pressure of 0.1 Pa. The mechanism by which the diffraction angle of the ZnO (\( 11\overline{2} 0 \)) plane on single-crystal NGO (001) substrates was shifted is discussed on the basis of anisotropic stress of lattice mismatch. The deposition rate of ZnO films decreased with an increase in working pressure, and the deposition rate on single-crystal NGO (001) substrates was larger than that on single-crystal sapphire (\( 01\overline{1} 2 \)) substrates. Root mean square (RMS) roughness of ZnO films increased with an increase in working pressure, and RMS roughness of ZnO films on single-crystal NGO (001) substrates was smaller than that of ZnO films on single-crystal sapphire (\( 01\overline{1} 2 \)) substrates even though the film thickness on single-crystal NGO (001) substrates was greater than that on sapphire substrates. It is thought that a single-crystal NGO (001) substrate is useful for deposition of non-polar ZnO (\( 11\overline{2} 0 \)) films.

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Authors and Affiliations

  1. National Institute of Technology, Sendai College, 4-16-1 Ayashi-Chuo, Sendai, 989-3128, Japan

    Y. Kashiwaba, Y. Tanaka, M. Sakuma, Y. Imai & K. Kawasaki

  2. Iwate University, 4-3-5 Ueda, Morioka, 020-8551, Japan

    T. Abe, A. Nakagawa, I. Niikura, Y. Kashiwaba & H. Osada

Authors
  1. Y. Kashiwaba
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  2. Y. Tanaka
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  3. M. Sakuma
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  4. T. Abe
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  5. Y. Imai
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  6. K. Kawasaki
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  7. A. Nakagawa
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  8. I. Niikura
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  9. Y. Kashiwaba
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  10. H. Osada
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Correspondence to Y. Kashiwaba.

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Kashiwaba, Y., Tanaka, Y., Sakuma, M. et al. Preparation of a Non-Polar ZnO Film on a Single-Crystal NdGaO3 Substrate by the RF Sputtering Method. J. Electron. Mater. 47, 4345–4350 (2018). https://doi.org/10.1007/s11664-018-6283-9

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  • DOI: https://doi.org/10.1007/s11664-018-6283-9

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