Thickness dependent surface microstructure evolution of bismuth thin film prepared by molecular beam deposition method

Title
Thickness dependent surface microstructure evolution of bismuth thin film prepared by molecular beam deposition method
Authors
안영근김영환김성일정광호
Keywords
micro structure; thin film; MBE; Bismuth thin film; Thickness dependent surface; microstructure evolution; Evolutionary selection model; Molecular beam deposition
Issue Date
2012-11
Publisher
Current applied physics
Citation
VOL 12, NO 6, 1518-1522
Abstract
The evolution of surface microstructure on bismuth thin film deposited by molecular beam deposition method is investigated. Morphological, topographical, structural, and electrical property changes of the film with various thicknesses are studied by means of AFM, XRD, XRR, and 4-point probe. Drastic change of surface grain in shape, which transforms from round shape to polyhedral shape, is detected around 13-18 nm film thickness. Abrupt horizontal profile change of surface grain is verified with power spectral density (PSD) function. At this threshold thickness, the film shows very low roughness value and surface area ratio. Then both increase steeply as the film thickness surpasses the thickness. As the bismuth film is deposited thicker, it has textured structure and high roughness on surface. With increment of the thickness, the electrical sheet resistance of the films is significantly decreased. We explain this surface microstructure evolution on the bismuth film with the evolutionary selection model.
URI
http://pubs.kist.re.kr/handle/201004/42929
ISSN
15671739
Appears in Collections:
KIST Publication > Article
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