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Chou, HY,O'Connor, E,Hurley, PK,Afanas'ev, VV,Houssa, M,Stesmans, A,Ye, PD,Newcomb, SB
2012
January
Applied Physics Letters
Interface barriers at the interfaces of polar GaAs(111) faces with Al2O3
Validated
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Optional Fields
WORK FUNCTION SURFACES
100
Internal photoemission measurements of barriers for electrons at interfaces between GaAs(111) and atomic-layer deposited Al2O3 indicate that changing the GaAs polar crystal face orientation from the Ga-terminated (111)A to the As-terminated (111)B has no effect on the barrier height and remains the same as at the non-polar GaAs(100)/Al2O3 interface. Moreover, the presence of native oxide on GaAs(111) or passivation of this surface with sulphur also have no measurable influence on the GaAs(111)/Al2O3 barrier. These results suggest that the orientation and composition-sensitive surface dipoles conventionally observed at GaAs surfaces are effectively compensated at GaAs/oxide interfaces. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3698461]
ARTN 141602
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