Geometric ordering, surface chemistry, band bending, and work function at decapped GaAs(100) surfaces

Vitomirov, I. M.; Raisanen, A.; Finnefrock, Adam C.; Viturro, R. E.; Brillson, L. J.; Kirchner, P. D.; Pettit, G. D.; Woodall, J. M.

doi:10.1103/physrevb.46.13293

Cited by 70 publications

(55 citation statements)

References 34 publications

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“…The work function is highly dependent on the details of the surface and its environment, as demonstrated by its known dependence on crystallographic orientation [4][5][6] , pressure/temperature [7][8][9][10][11][12][13] and pH of solution 14,15 , interaction with adjacent solvents 16 , and surface molecular physisorption 17,18 and chemisorption 19 .…”

Section: Introductionmentioning

confidence: 99%

Controlling oxide surface dipole and reactivity with intrinsic nonstoichiometric epitaxial reconstructions

et al. 2015

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The composition and reconstruction of oxide surfaces can be deterministically controlled via ambient conditions. We demonstrate that such intrinsic alterations can have a crucial effect on the surface dipole and reactivity, even for surfaces with the same crystallographic plane. The surface dipole potential drops of BaTiO3, SrTiO3, LaFeO3 and TiO2 surfaces with various reconstructions and compositions are shown to vary by as much as 5 V, leading to significant variation of the band edge positions at these surfaces. These variations are shown to correlate with the calculated oxygen binding energy, demonstrating how oxide surface reactivity can be substantially manipulated using environmental changes.

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Section: Introductionmentioning

confidence: 99%

Controlling oxide surface dipole and reactivity with intrinsic nonstoichiometric epitaxial reconstructions

et al. 2015

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“…Circular Ga droplets introduced by over annealing have been found on the surface by other group [8]. This is believed to be due to the decomposition of the GaAs surface during over-annealing.…”

Section: Resultsmentioning

confidence: 81%

Annealing induced Fe oxide nanostructures on GaAs

Ahmad

et al. 2005

INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.

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We report the evolution of Fe oxide nanostructures on GaAs(100) upon pre-and post-growth annealing conditions. GaAs nanoscale pyramids were formed on the GaAs surface due to wet etching and thermal annealing. An 8.0-nm epitaxial Fe film was grown, oxidized, and annealed using a gradient temperature method. During the process the nanostripes were formed, and the evolution has been demonstrated using transmission and reflection high energy electron diffraction, and scanning electron microscopy. These nanostripes exhibited uniaxial magnetic anisotropy. The formation of these nanostructures is attributed to surface anisotropy, which in addition could explain the observed uniaxial magnetic anisotropy.

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“…The surface component shifted to lower binding energies is well known to stem from As atoms of the (4 × 2) reconstructed phase and is, therefore, labeled As 4×2 . [38][39][40] The surface component B shifted to higher binding energies is usually not observed at the (4×2) reconstructed phase. In our experiments, we could observe this component only when we observed a significant (n × 6) symmetry in LEED.…”

Section: Methodsmentioning

confidence: 99%

Electrophilic surface sites as precondition for the chemisorption of pyrrole on GaAs(001) surfaces

Bruhn

Fimland

Vogt

2015

The Journal of Chemical Physics

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Originally published as:Bruhn, T., Fimland, B.-O., Vogt, P. (2015): Electrophilic surface sites as precondition for the chemisorption of pyrrole on GaAs (001) We report how the presence of electrophilic surface sites influences the adsorption mechanism of pyrrole on GaAs(001) surfaces. For this purpose, we have investigated the adsorption behavior of pyrrole on different GaAs(001) reconstructions with different stoichiometries and thus different surface chemistries. The interfaces were characterized by x-ray photoelectron spectroscopy, scanning tunneling microscopy, and by reflectance anisotropy spectroscopy in a spectral range between 1.5 and 5 eV. On the As-rich c(4 × 4) reconstruction that exhibits only nucleophilic surface sites, pyrrole was found to physisorb on the surface without any significant modification of the structural and electronic properties of the surface. On the Ga-rich GaAs(001)-(4 × 2)/(6 × 6) reconstructions which exhibit nucleophilic as well as electrophilic surface sites, pyrrole was found to form stable covalent bonds mainly to the electrophilic (charge deficient) Ga atoms of the surface. These results clearly demonstrate that the existence of electrophilic surface sites is a crucial precondition for the chemisorption of pyrrole on GaAs(001) surfaces. C 2015 AIP Publishing LLC. [http://dx

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Geometric ordering, surface chemistry, band bending, and work function at decapped GaAs(100) surfaces

Cited by 70 publications

References 34 publications

Controlling oxide surface dipole and reactivity with intrinsic nonstoichiometric epitaxial reconstructions

Controlling oxide surface dipole and reactivity with intrinsic nonstoichiometric epitaxial reconstructions

Annealing induced Fe oxide nanostructures on GaAs

Electrophilic surface sites as precondition for the chemisorption of pyrrole on GaAs(001) surfaces

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