Chemical bonding states and energy band gap of SiO2-incorporated La2O3 films on n-GaAs (001)

Jun Kyu Yang, Woo Sik Kim, Hyung Ho Park

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20 Citations (Scopus)

Abstract

La-silicate of (La2O3)0.6(SiO 2)0.4 was prepared by e-beam evaporation of mixed oxides target to control the chemical bonding state and band structure of La 2O3 film on n-GaAs (001). Prior to deposition of La-silicate film, sulfur passivation was performed on the surface of GaAs. The composition and uniformity of La-silicate film were simulated from the ratio of photoelectron intensity, ILa 4d/ISi 2p, using angle resolved X-ray photoelectron spectroscopy. The formation of hydroxide phase was effectively prohibited when La-silicate is formed. Energy band gap of La 2O3 and La-silicate were estimated as ∼ 5.6 eV and ∼ 6.5 eV, respectively, by combining valence band and absorption spectra. The change in the energy band structure with regard to n-GaAs was correlated with electrical properties. An enhanced conduction band offset of La-silicate is evidenced by Fowler-Nordheim tunneling mechanism.

Original languageEnglish
Pages (from-to)311-314
Number of pages4
JournalThin Solid Films
Volume494
Issue number1-2
DOIs
Publication statusPublished - 2006 Jan 3

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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