Face Dependence of Schottky Barriers Heights of Silicides and Germanides on Si and Ge

Abstract Density functional supercell calculations of the Schottky barrier heights (SBH) of metal germanides and silicides on Si or Ge find that these vary with the facet, unlike those of elemental metals. In addition, silicides and germanides show a stronger dependence of their SBHs on the work fun...

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Autores principales:	Hongfei Li, Yuzheng Guo, John Robertson
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/769cf18537ba4bfda7a7ba0a4677af79
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spelling	oai:doaj.org-article:769cf18537ba4bfda7a7ba0a4677af792021-12-02T11:53:07ZFace Dependence of Schottky Barriers Heights of Silicides and Germanides on Si and Ge10.1038/s41598-017-16803-62045-2322https://doaj.org/article/769cf18537ba4bfda7a7ba0a4677af792017-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-16803-6https://doaj.org/toc/2045-2322Abstract Density functional supercell calculations of the Schottky barrier heights (SBH) of metal germanides and silicides on Si or Ge find that these vary with the facet, unlike those of elemental metals. In addition, silicides and germanides show a stronger dependence of their SBHs on the work function than those of elemental metals, as seen experimentally. Both effects are beyond the standard metal induced gap states model. NiSi2 is found to have a much lower SBH on n-Si(100) than on n-Si(111), as seen experimentally. It is shown how such results can be used to design lower SBH contacts for n-Ge, which are needed technologically. The SBHs of the better behaved Si/silicide interfaces can be used to benchmark the behavior of the less well behaved Ge-germanide interfaces for this purpose. The dependence of the SBH of epitaxial Pb-Si(111) on its reconstruction is also covered.Hongfei LiYuzheng GuoJohn RobertsonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hongfei Li Yuzheng Guo John Robertson Face Dependence of Schottky Barriers Heights of Silicides and Germanides on Si and Ge
description	Abstract Density functional supercell calculations of the Schottky barrier heights (SBH) of metal germanides and silicides on Si or Ge find that these vary with the facet, unlike those of elemental metals. In addition, silicides and germanides show a stronger dependence of their SBHs on the work function than those of elemental metals, as seen experimentally. Both effects are beyond the standard metal induced gap states model. NiSi2 is found to have a much lower SBH on n-Si(100) than on n-Si(111), as seen experimentally. It is shown how such results can be used to design lower SBH contacts for n-Ge, which are needed technologically. The SBHs of the better behaved Si/silicide interfaces can be used to benchmark the behavior of the less well behaved Ge-germanide interfaces for this purpose. The dependence of the SBH of epitaxial Pb-Si(111) on its reconstruction is also covered.
format	article
author	Hongfei Li Yuzheng Guo John Robertson
author_facet	Hongfei Li Yuzheng Guo John Robertson
author_sort	Hongfei Li
title	Face Dependence of Schottky Barriers Heights of Silicides and Germanides on Si and Ge
title_short	Face Dependence of Schottky Barriers Heights of Silicides and Germanides on Si and Ge
title_full	Face Dependence of Schottky Barriers Heights of Silicides and Germanides on Si and Ge
title_fullStr	Face Dependence of Schottky Barriers Heights of Silicides and Germanides on Si and Ge
title_full_unstemmed	Face Dependence of Schottky Barriers Heights of Silicides and Germanides on Si and Ge
title_sort	face dependence of schottky barriers heights of silicides and germanides on si and ge
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/769cf18537ba4bfda7a7ba0a4677af79
work_keys_str_mv	AT hongfeili facedependenceofschottkybarriersheightsofsilicidesandgermanidesonsiandge AT yuzhengguo facedependenceofschottkybarriersheightsofsilicidesandgermanidesonsiandge AT johnrobertson facedependenceofschottkybarriersheightsofsilicidesandgermanidesonsiandge
_version_	1718394873164333056

Face Dependence of Schottky Barriers Heights of Silicides and Germanides on Si and Ge

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