Energy band structure and electrical properties of (La2 O 3) 1-x (SiO2) x (0≤x≤1) n-GaAs (001) system

Jun Kyu Yang, Hyung Ho Park

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20 Citations (Scopus)


This letter investigates the chemical bonding state and energy band structure of (La2 O3) 1-x (SiO2) x (0≤x≤1) films grown on sulfur-passivated n -GaAs (001). The dielectric bandgap and interfacial band alignment were modified by compounding the La2 O3 films with SiO2. A shift in binding energy of the core level was observed by comparing the electronegativities of the second nearest-neighbor element. The controlled parameters of energy band structure were systematically monitored by valence band and absorption spectra. Band offset values were almost linearly related to the concentration of SiO2 when no Fermi level pinning in the midgap of n -GaAs was assumed. The correlation between band parameter and electrical properties, as probed by capacitance and leakage current measurements, is discussed.

Original languageEnglish
Article number202102
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number20
Publication statusPublished - 2005 Nov 14

Bibliographical note

Funding Information:
This work was supported by Korea Research Foundation Grant No. (KRF-2004-041-D00431). The experiments at PLS were supported in part by MOST and POSTECH.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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