Ge(011)-c(8×10) surface structure and hydrogen desorption pathways

A temperature-programmed desorption and scanning tunneling microscopy study

Hyungjun Kim, A. Vailionis, D. G. Cahill, J. E. Greene

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Temperature-programmed desorption (TPD) and scanning tunneling microscopy (STM) were used to probe the atomic arrangement on clean Ge(011)-c(8×10), as well as the desorption kinetics and pathways from hydrogen-adsorbed surfaces. For the TPD measurements, the samples were heated at 2 °C s-1 after adsorbing atomic deuterium at 100 °C to coverages θD ranging up to saturation. Low-energy electron diffraction (LEED) and STM show that saturation deuterium coverage results in a (1×1) structure with the surface composed of randomly distributed adatom islands. TPD spectra exhibit three second-order peaks corresponding to D2 desorption from multideuterides, adatom monodeuterides and rest-atom monodeuterides. Desorption from the multideuteride phase (with an activation energy Ea of 1.61 eV) begins at 200 °C and, by 270 °C, only the D-adatom and D-rest-atom monodeuteride phases remain. D2 begins to desorb from adatom sites (Ea = 1.76 eV) above 230 °C and from rest-atom sites (Ea = 1.83 eV) above 240 °C. From quantitative analyses of the TPD spectra, the adatom density on the clean surface is ≥0.47. This high adatom density - similar to that of Si(111)-(7×7), Si(011)-(16×2) and Ge(111)-c(2×8), all of which contain adatoms and rest atoms as primary building blocks - appears to rule out previously proposed models for the Ge(011)-c(8×10) surface structure, for which the adatom density is 0.064.

Original languageEnglish
Pages (from-to)337-344
Number of pages8
JournalSurface Science
Volume457
Issue number3
DOIs
Publication statusPublished - 2000 Jun 10

Fingerprint

Adatoms
Scanning tunneling microscopy
Temperature programmed desorption
Surface structure
adatoms
scanning tunneling microscopy
Hydrogen
Desorption
desorption
hydrogen
Atoms
temperature
Deuterium
atoms
deuterium
saturation
Low energy electron diffraction
electron diffraction
Activation energy
activation energy

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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abstract = "Temperature-programmed desorption (TPD) and scanning tunneling microscopy (STM) were used to probe the atomic arrangement on clean Ge(011)-c(8×10), as well as the desorption kinetics and pathways from hydrogen-adsorbed surfaces. For the TPD measurements, the samples were heated at 2 °C s-1 after adsorbing atomic deuterium at 100 °C to coverages θD ranging up to saturation. Low-energy electron diffraction (LEED) and STM show that saturation deuterium coverage results in a (1×1) structure with the surface composed of randomly distributed adatom islands. TPD spectra exhibit three second-order peaks corresponding to D2 desorption from multideuterides, adatom monodeuterides and rest-atom monodeuterides. Desorption from the multideuteride phase (with an activation energy Ea of 1.61 eV) begins at 200 °C and, by 270 °C, only the D-adatom and D-rest-atom monodeuteride phases remain. D2 begins to desorb from adatom sites (Ea = 1.76 eV) above 230 °C and from rest-atom sites (Ea = 1.83 eV) above 240 °C. From quantitative analyses of the TPD spectra, the adatom density on the clean surface is ≥0.47. This high adatom density - similar to that of Si(111)-(7×7), Si(011)-(16×2) and Ge(111)-c(2×8), all of which contain adatoms and rest atoms as primary building blocks - appears to rule out previously proposed models for the Ge(011)-c(8×10) surface structure, for which the adatom density is 0.064.",
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Ge(011)-c(8×10) surface structure and hydrogen desorption pathways : A temperature-programmed desorption and scanning tunneling microscopy study. / Kim, Hyungjun; Vailionis, A.; Cahill, D. G.; Greene, J. E.

In: Surface Science, Vol. 457, No. 3, 10.06.2000, p. 337-344.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ge(011)-c(8×10) surface structure and hydrogen desorption pathways

T2 - A temperature-programmed desorption and scanning tunneling microscopy study

AU - Kim, Hyungjun

AU - Vailionis, A.

AU - Cahill, D. G.

AU - Greene, J. E.

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AB - Temperature-programmed desorption (TPD) and scanning tunneling microscopy (STM) were used to probe the atomic arrangement on clean Ge(011)-c(8×10), as well as the desorption kinetics and pathways from hydrogen-adsorbed surfaces. For the TPD measurements, the samples were heated at 2 °C s-1 after adsorbing atomic deuterium at 100 °C to coverages θD ranging up to saturation. Low-energy electron diffraction (LEED) and STM show that saturation deuterium coverage results in a (1×1) structure with the surface composed of randomly distributed adatom islands. TPD spectra exhibit three second-order peaks corresponding to D2 desorption from multideuterides, adatom monodeuterides and rest-atom monodeuterides. Desorption from the multideuteride phase (with an activation energy Ea of 1.61 eV) begins at 200 °C and, by 270 °C, only the D-adatom and D-rest-atom monodeuteride phases remain. D2 begins to desorb from adatom sites (Ea = 1.76 eV) above 230 °C and from rest-atom sites (Ea = 1.83 eV) above 240 °C. From quantitative analyses of the TPD spectra, the adatom density on the clean surface is ≥0.47. This high adatom density - similar to that of Si(111)-(7×7), Si(011)-(16×2) and Ge(111)-c(2×8), all of which contain adatoms and rest atoms as primary building blocks - appears to rule out previously proposed models for the Ge(011)-c(8×10) surface structure, for which the adatom density is 0.064.

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