期刊
PHYSICAL REVIEW B
卷 74, 期 3, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.74.033104
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The crystallography of epitaxial dysprosium silicide nanometer scale islands on Si(001) has been studied using transmission electron microscopy. Cross-sectional high resolution images show that the silicide nanostructures have either hexagonal or orthorhombic/tetragonal crystal structure. Moire fringe patterns from plan view specimens show that elongated islands have the hexagonal structure while islands with smaller aspect ratios have the orthorhombic/tetragonal structure of DySi2. Less lattice distortion and/or fewer dislocations are seen along the small lattice mismatch direction for both the hexagonal and orthorhombic/tetragonal silicides, indicating that lattice mismatch plays an important role in controlling island morphology.
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