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Photoemission and density functional theory study of Ge(100): Clean surface and Yb-induced (2x4) reconstruction

Kuzmin, M.; Punkkinen, M. P. J.; Laukkanen, P.; Perala, R. E.; Lang, J. J. K.; Dahl, J.; Adell, Johan LU and Kokko, K. (2013) In Surface Science 615. p.88-96
Abstract
Clean and metal-adsorbed (100) surfaces of group-IV semiconductors, such as Si and Ge, often exhibit electronically and structurally similar reconstructions. However, the fundamental bulk properties of group-IV materials can have an impact on particular features of such systems, which are related, e.g., to final-state relaxation in photoemission and thus determine their spectral line shape. Here we have studied Yb/Ge(100)(2 x 4) reconstruction as well as clean Ge(100) surface by high-resolution photoelectron spectroscopy and ab initio calculations. An atomic geometry of both surfaces is thoroughly investigated. A detailed analysis of Ge 3d core-level photoemission, atomic origins of surface-shifted components, and final-state screening... (More)
Clean and metal-adsorbed (100) surfaces of group-IV semiconductors, such as Si and Ge, often exhibit electronically and structurally similar reconstructions. However, the fundamental bulk properties of group-IV materials can have an impact on particular features of such systems, which are related, e.g., to final-state relaxation in photoemission and thus determine their spectral line shape. Here we have studied Yb/Ge(100)(2 x 4) reconstruction as well as clean Ge(100) surface by high-resolution photoelectron spectroscopy and ab initio calculations. An atomic geometry of both surfaces is thoroughly investigated. A detailed analysis of Ge 3d core-level photoemission, atomic origins of surface-shifted components, and final-state screening effects is presented. In particular, it is demonstrated that the core-hole screening plays an essential role in Ge 3d measurements, and that its amount in the complete screening model correlates well with the core-level binding energy of respective Ge atoms in the initial state. The results are discussed in the proper context of related reconstructions on Si(100). (C) 2013 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Germanium, Ytterbium, Photoelectron spectroscopy, DFT calculation, Atomic structure, Surface core-level shift
in
Surface Science
volume
615
pages
88 - 96
publisher
Elsevier
external identifiers
  • wos:000321409400012
  • scopus:84878801903
ISSN
0039-6028
DOI
10.1016/j.susc.2013.04.010
language
English
LU publication?
yes
id
a00b97e0-a32f-44b8-acf5-a4d37420ebdd (old id 3975420)
date added to LUP
2013-08-21 17:29:22
date last changed
2019-02-20 06:03:12
@article{a00b97e0-a32f-44b8-acf5-a4d37420ebdd,
  abstract     = {Clean and metal-adsorbed (100) surfaces of group-IV semiconductors, such as Si and Ge, often exhibit electronically and structurally similar reconstructions. However, the fundamental bulk properties of group-IV materials can have an impact on particular features of such systems, which are related, e.g., to final-state relaxation in photoemission and thus determine their spectral line shape. Here we have studied Yb/Ge(100)(2 x 4) reconstruction as well as clean Ge(100) surface by high-resolution photoelectron spectroscopy and ab initio calculations. An atomic geometry of both surfaces is thoroughly investigated. A detailed analysis of Ge 3d core-level photoemission, atomic origins of surface-shifted components, and final-state screening effects is presented. In particular, it is demonstrated that the core-hole screening plays an essential role in Ge 3d measurements, and that its amount in the complete screening model correlates well with the core-level binding energy of respective Ge atoms in the initial state. The results are discussed in the proper context of related reconstructions on Si(100). (C) 2013 Elsevier B.V. All rights reserved.},
  author       = {Kuzmin, M. and Punkkinen, M. P. J. and Laukkanen, P. and Perala, R. E. and Lang, J. J. K. and Dahl, J. and Adell, Johan and Kokko, K.},
  issn         = {0039-6028},
  keyword      = {Germanium,Ytterbium,Photoelectron spectroscopy,DFT calculation,Atomic structure,Surface core-level shift},
  language     = {eng},
  pages        = {88--96},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Photoemission and density functional theory study of Ge(100): Clean surface and Yb-induced (2x4) reconstruction},
  url          = {http://dx.doi.org/10.1016/j.susc.2013.04.010},
  volume       = {615},
  year         = {2013},
}