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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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