Structural studies of sulfur-passivated GaAs (100) surfaces with LEED and AFM

Y. Ke, S. Milano, X. W. Wang, Nongjian Tao, Y. Darici

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We present the results of Auger electron spectroscopy (AES), low-energy electron diffraction (LEED) and atomic force microscopy (AFM) analysis of sulfur-passivating layers on the GaAs (100) surface. The GaAs surfaces were passivated with both inorganic [(NH4)2Sx] and organic [octadecylthiol (ODT)] S-based compounds. We prepared the inorganic sulfur-passivated GaAs(100) surfaces with a wet chemical treatment using (NH4)2S solution. This was followed by thermal annealing of the treated sample in an ultra-high vacuum (UHV). After ex-situ and in-situ treatments, the surface resulted in a (2 × 1) LEED pattern. The LEED data (I-E curves) were recorded and compared with dynamical LEED calculations for different structural models for the sulfur-passivated GaAs (100) surface. The results showed that the sulfur-passivated (2 × 1) surface structure is an arsenic-sulfur dimer on a Ga-terminated substrate. The ex-situ AFM results also revealed a (2 × 1) structure for the inorganic passivation and a very smooth surface for the organic ODT in the ethanol-treated sample.

Original languageEnglish (US)
Pages (from-to)29-36
Number of pages8
JournalSurface Science
Volume415
Issue number1-2
StatePublished - Sep 30 1998
Externally publishedYes

Fingerprint

Low energy electron diffraction
Sulfur
Atomic force microscopy
sulfur
electron diffraction
atomic force microscopy
energy
Arsenic
Ultrahigh vacuum
Auger electron spectroscopy
Passivation
Surface structure
Dimers
Diffraction patterns
gallium arsenide
arsenic
Ethanol
ultrahigh vacuum
passivity
Auger spectroscopy

Keywords

  • Atomic force microscopy
  • Gallium arsenide
  • Low-energy electron diffraction
  • Roughness
  • Sulfur
  • Surface structure

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Ke, Y., Milano, S., Wang, X. W., Tao, N., & Darici, Y. (1998). Structural studies of sulfur-passivated GaAs (100) surfaces with LEED and AFM. Surface Science, 415(1-2), 29-36.

Structural studies of sulfur-passivated GaAs (100) surfaces with LEED and AFM. / Ke, Y.; Milano, S.; Wang, X. W.; Tao, Nongjian; Darici, Y.

In: Surface Science, Vol. 415, No. 1-2, 30.09.1998, p. 29-36.

Research output: Contribution to journalArticle

Ke, Y, Milano, S, Wang, XW, Tao, N & Darici, Y 1998, 'Structural studies of sulfur-passivated GaAs (100) surfaces with LEED and AFM', Surface Science, vol. 415, no. 1-2, pp. 29-36.
Ke Y, Milano S, Wang XW, Tao N, Darici Y. Structural studies of sulfur-passivated GaAs (100) surfaces with LEED and AFM. Surface Science. 1998 Sep 30;415(1-2):29-36.
Ke, Y. ; Milano, S. ; Wang, X. W. ; Tao, Nongjian ; Darici, Y. / Structural studies of sulfur-passivated GaAs (100) surfaces with LEED and AFM. In: Surface Science. 1998 ; Vol. 415, No. 1-2. pp. 29-36.
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AB - We present the results of Auger electron spectroscopy (AES), low-energy electron diffraction (LEED) and atomic force microscopy (AFM) analysis of sulfur-passivating layers on the GaAs (100) surface. The GaAs surfaces were passivated with both inorganic [(NH4)2Sx] and organic [octadecylthiol (ODT)] S-based compounds. We prepared the inorganic sulfur-passivated GaAs(100) surfaces with a wet chemical treatment using (NH4)2S solution. This was followed by thermal annealing of the treated sample in an ultra-high vacuum (UHV). After ex-situ and in-situ treatments, the surface resulted in a (2 × 1) LEED pattern. The LEED data (I-E curves) were recorded and compared with dynamical LEED calculations for different structural models for the sulfur-passivated GaAs (100) surface. The results showed that the sulfur-passivated (2 × 1) surface structure is an arsenic-sulfur dimer on a Ga-terminated substrate. The ex-situ AFM results also revealed a (2 × 1) structure for the inorganic passivation and a very smooth surface for the organic ODT in the ethanol-treated sample.

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