Unified mechanism of the surface Fermi level pinning in III-As nanowires

Nanotechnology
Prokhor A AlekseevVladimir L Berkovits

Abstract

Fermi level pinning at the oxidized (110) surfaces of III-As nanowires (GaAs, InAs, InGaAs, AlGaAs) is studied. Using scanning gradient Kelvin probe microscopy, we show that the Fermi level at oxidized cleavage surfaces of ternary Al x Ga1-x As (0 ≤ x ≤ 0.45) and Ga x In1-x As (0 ≤ x ≤ 1) alloys is pinned at the same position of 4.8 ± 0.1 eV with regard to the vacuum level. The finding implies a unified mechanism of the Fermi level pinning for such surfaces. Further investigation, performed by Raman scattering and photoluminescence spectroscopy, shows that photooxidation of the Al x Ga1-x As and Ga x In1-x As nanowires leads to the accumulation of an excess of arsenic on their crystal surfaces which is accompanied by a strong decrease of the band-edge photoluminescence intensity. We conclude that the surface excess arsenic in crystalline or amorphous forms is responsible for the Fermi level pinning at oxidized (110) surfaces of III-As nanowires.

References

Feb 15, 1996·Physical Review. B, Condensed Matter·H Yamaguchi, Y Horikoshi
Apr 12, 2007·Nano Letters·H-Y LiE P A M Bakkers
Jul 16, 2011·Nanotechnology·S YazjiG Abstreiter
Aug 15, 2012·Nano Letters·Chia-Chi ChangStephen B Cronin
Dec 2, 2014·Nano Letters·Prokhor A AlekseevVladimir L Berkovits
Jul 28, 2016·Nano Letters·Maximilian SpeckbacherGregor Koblmüller

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Citations

Apr 18, 2019·Nanotechnology·Adrian Díaz ÁlvarezBruno Grandidier
Jun 14, 2020·Micromachines·Prokhor A AlekseevGeorge E Cirlin
Jun 18, 2019·Nano Letters·Prokhor A AlekseevVladimir L Berkovits

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