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Influence of vacuum degree on growth of Bi2Te3 single crystal |
| Tang Yan-Kun (唐雁坤), Zhao Wen-Juan (赵文娟), Zhu Hua-Qiang (朱化强), Huang Yong-Chao (黄勇潮), Cao Wei-Wei (曹伟伟), Yang Qian (杨倩), Yao Xiao-Yan (姚晓燕), Zhai Ya (翟亚), Dong Shuai (董帅) |
| Department of Physics, Southeast University, Nanjing 211189, China |
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Abstract Bi2Te3 single crystals were prepared by the solid-state reaction method. The effect of the vacuum on the growth of Bi2Te3 single crystals was studied with varying the oxygen content by controlling the air pressure in the silica tube. High quality Bi2Te3 single crystals have been obtained and there is no influence on the growth by an extremely small amount of oxygen in a high vacuum at 1.0 × 10-3 Pa. As the air pressure is increased at 1.0 × 10-2 Pa, oxygen only mainly impacts on the growth of the surface for the prepared samples. Micron-sized rod-like structure and flower-like clusters are observed on the surface. For the samples prepared at 1.0 × 10-1 Pa, x-ray diffraction data show that the yellow part on the surface is Bi2TeO5, while the Bi2Te3 single crystal is still the major phase as the inside part. More interestingly, various crystal morphologies are observed by scanning electron microscope for Bi2Te3 near the boundary between Bi2Te3 and Bi2TeO5. Possible growth mechanisms for Bi2Te3 with different morphologies are discussed in detail.
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Received: 25 January 2015
Revised: 29 January 2015
Accepted manuscript online:
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PACS:
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81.05.Bx
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(Metals, semimetals, and alloys)
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81.10.Pq
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(Growth in vacuum)
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68.37.Hk
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(Scanning electron microscopy (SEM) (including EBIC))
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10904013 and 11274060), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BK2009260 and BK20141329), and the Scientific Research Staring Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China. |
Corresponding Authors:
Tang Yan-Kun
E-mail: yktang@seu.edu.cn
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Cite this article:
Tang Yan-Kun (唐雁坤), Zhao Wen-Juan (赵文娟), Zhu Hua-Qiang (朱化强), Huang Yong-Chao (黄勇潮), Cao Wei-Wei (曹伟伟), Yang Qian (杨倩), Yao Xiao-Yan (姚晓燕), Zhai Ya (翟亚), Dong Shuai (董帅) Influence of vacuum degree on growth of Bi2Te3 single crystal 2015 Chin. Phys. B 24 078101
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