NDLI: Ordered $CaSi_{2}$ Microwall Arrays on Si Substrates Induced by the Kirkendall Effect

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Ordered $CaSi_{2}$ Microwall Arrays on Si Substrates Induced by the Kirkendall Effect

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Itahara, Hiroshi Ueki, Akiko Meng, Xiang Tatsuoka, Hirokazu
Description	Author Affiliation: Meng X ( Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johuku, Naka-ku, Hamamatsu, Shizuoka, 432-8561, Japan.); Ueki A ( Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi, 480-1192, Japan.); Tatsuoka H ( Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johuku, Naka-ku, Hamamatsu, Shizuoka, 432-8561, Japan.); Itahara H ( Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi, 480-1192, Japan.)
Abstract	We have specified the synthetic conditions to obtain one-directionally ordered $CaSi_{2}$ microwall arrays vertically grown on a Si substrate. Our basic concept is based on the utilization of the Kirkendall effect for reactive deposition epitaxy (RDE). We found for the first time that: 1) a much larger Ca vapor supply on the Si substrate than the conventional RDE, 2) the adoption of a two-step heating process, and 3) the selection of the crystal axis of the Si surface are the keys to control the microstructures of $CaSi_{2}$ on the Si substrate. The CaSi phase was first formed on Si, then the $CaSi_{2}$ phase was formed at the CaSi/Si interface. Based on the Kirkendall effect, the interdiffusion of Ca and Si was enhanced in the vertical direction rather than in the parallel direction to the Si surface. $CaSi_{2}$ tends to grow along four equivalent Si{111} planes, however, the specific orientation of the Si surface resulted in $CaSi_{2}$ microwalls grown along its Si(11 1 ‾ ) plane, the only plane directing nearly vertical to the surface among the Si{111} planes. These results suggest that the Kirkendall effect under asymmetric growth of target materials would be a rational strategy to obtain their ordered microstructures.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	13
Volume Number	23
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2017-03-02
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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