Highly oriented diamond growth on SixGe1−x (100) thin films |
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Authors: | Te-Fu Chang Li Chang |
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Affiliation: | Department of Materials Science and Engineering, National Chiao Tung University, 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan, ROC |
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Abstract: | Highly oriented (100) diamond films have been successfully grown on SixGe1−x (100) thin films by bias enhanced nucleation (BEN) in microwave plasma chemical vapor deposition (MPCVD) system. Raman spectra show the 1332 cm−1 peak which proves the formation of diamond. Diamond nucleation density on SixGe1−x substrate estimated by scanning electron microscopy is higher than 109 cm−2. The interface between diamond and SixGe1−x substrate was characterized by transmission electron microscopy (TEM). About 20 nm decrease in thickness of the SixGe1−x film was observed after bias enhanced nucleation step. TEM shows the existence of silicon carbide and heteroepitaxial diamond grains grown on SixGe1−x substrate. Characterization from high-resolution TEM on the specimen of short time deposition reveals that a number of epitaxial diamond grains were directly nucleated on SixGe1−x with {111} interplanar spacing ratio of diamond and SixGe1−x of 2:3. The diamond nucleation is found to be preferred on the ridge position of the rough substrate surface. Diamond {100} facets were quickly developed in the early stage of growth. |
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Keywords: | Diamond SixGe1− x Nucleation Transmission electron microscopy |
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