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Controlled Surface Fermi-level on the SeS2-passivated n-GaAs (100)

Published online by Cambridge University Press:  10 February 2011

Jing xi Sun ,
F. J. Himpsel  and
T. F. Kuech
Jing xi Sun
Affiliation:
Department of Chemical Engineering
F. J. Himpsel
Affiliation:
Department of PhysicsUniversity of Wisconsin-Madison Madison, WI 53706
T. F. Kuech
Affiliation:
Department of Chemical Engineering
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Abstract

Selenium disulfide surface treatment can unpin the surface Fermi-level on n-GaAs (100) surfaces, resulting in a reduction in the surface band bending. The long-term stability of the surface Fermi-level unpinning has been studied using photoreflectance spectroscopy under room ambient conditions. Our results show that the SeS2-treated n-GaAs (100) surface is stable up to four months with negligible shift in the surface Fermi-level being noted. The mechanism of the long-term stability is attributed to the layered surface structure formed on the SeS2-treated n- GaAs (100) surface. The chemical structure of the passivated surface was determined by synchrotron radiation photoemission spectroscopy. The outermost layer of sulfur and arsenicbased sulfides and selenides may protect the electronic passivating layer, which consists of gallium-based selenides, from interaction with the atmosphere.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 510: Symposium D – Defect & Impurity Engineered Semiconductors & Devices II , January 1998 , 653
Copyright
Copyright © Materials Research Society 1998

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