期刊
JOURNAL OF MATERIALS SCIENCE
卷 50, 期 1, 页码 28-33出版社
SPRINGER
DOI: 10.1007/s10853-014-8561-0
关键词
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资金
- A-Star SERC [1321202068]
- Singapore National Research Foundation under its Competitive Research Funding [NRF-CRP 8-2011-06, NRF2008NRF-CRP002024]
- MOE-AcRF-Tier-2 [MOE2010-T2-2-121]
The development of technologically important material zinc-blende ZnO has been hindered due to the difficulties inherent in obtaining a stable zinc-blende phase. In this paper, we fabricate the stable zinc-blende ZnO on Pt/Ti/SiO2/Si substrate through phase transformation from the originally wurtzite to the zinc-blende phase. X-ray diffraction data in combination with high-resolution TEM measurements provide the direct evidence on the formation of the well-defined zinc-blende structure with predominated (202) orientation. According to the experimental results and first principles calculations, the incorporation of titanium dopants into ZnO system favors the formation of the zinc-blende structure. The platinum (Pt) surface stabilizes the ZnO zinc-blende structure at the interface (thin film) due to its low ZnO/Pt interface energy, preventing the decomposition in ZnO wurtzite and Zn2TiO4. Additionally, magnetic and optical properties of the ZnO zinc-blende thin films are investigated. Unexpectedly, the film is found to exhibit magnetization of similar to 75 cmu/cm(3), while its ZnO wurtzite counterpart is non-ferromagnetic.
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