Scanning tunneling microscope investigation of the growth morphology of titanium silicide on Si(111) substrates
作者:
A. W. Stephenson,
M. E. Welland,
期刊:
Journal of Applied Physics
(AIP Available online 1995)
卷期:
Volume 78,
issue 8
页码: 5143-5154
ISSN:0021-8979
年代: 1995
DOI:10.1063/1.359747
出版商: AIP
数据来源: AIP
摘要:
A scanning tunneling microscope in ultrahigh vacuum has been used to investigate the growth, morphology, and surface atomic structure of ultrathin titanium silicide films on Si(111) substrates. Microstructural considerations have been used to identify various stages of the silicide growth. Atomic resolution images of a titanium silicide crystallite facet, formed at 850 °C, have been identified as a 2×2 silicon termination of a C54‐TiSi2(010) surface. Possible epitaxial silicide/silicon relationships are provided. Theoretical consideration has been given to the interatomic bonding in the C54‐TiSi2lattice and the dangling bond density of ideally terminated silicide planes has been calculated. The highly reconstructed atomically flat surface of a large crystallite, formed at 1200 °C, has been assigned as a C54‐TiSi2(311) plane giving the epitaxial relation C54‐TiSi2(311)∥Si(111). The presence of pairs and linear chains of defects, with common orientations, is attributed to the decomposition of a diatomic gas on the facet, producing sites of preferential adsorption on the silicide surface. ©1995 American Institute of Physics.
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