Local electronic structure and surface geometry of Ag on Si(111)
作者:
J. E. Demuth,
E. J. Von Lenen,
R. M. Tromp,
R. J. Hamers,
期刊:
Journal of Vacuum Science&Technology B: Microelectronics Processing and Phenomena
(AIP Available online 1988)
卷期:
Volume 6,
issue 1
页码: 18-25
ISSN:0734-211X
年代: 1988
DOI:10.1116/1.584042
出版商: American Vacuum Society
关键词: SURFACE STATES;MORPHOLOGY;SILVER;SILICON;DEEP ENERGY LEVELS;ISLAND STRUCTURE;FILM GROWTH;SURFACE STRUCTURE;CRYSTAL DEFECTS;Si
数据来源: AIP
摘要:
Scanning tunneling microscopy has been used to evaluate the overall morphology and growth conditions for Ag ordered overlayer and island films on Si(111), and to determine the nature of the √3×√3 Ag/Si(111) structure. Current image tunneling spectroscopy (CITS) is used to examine the energy‐dependent tunneling and evaluate possible model structures for the √3×√3 structure. Support is found for a √3×√3 structure composed of Ag trimers embedded below the top layer of threefold coordinated Si atoms. The surface electronic structure for these √3 structures shows a 1.2 eV gap, and exhibits very few intrinsic states nearEF. The few defects observed in the √3 areas of this surface introduce deep levels while the most dominant tunneling features nearEFappear to be associated with Ag islands that coexist with √3 areas. The implications of the surface perfection and local electronic structure to Schottky barrier formation are discussed.
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