Unpinned (100) GaAs surfaces in air using photochemistry
作者:
S. D. Offsey,
J. M. Woodall,
A. C. Warren,
P. D. Kirchner,
T. I. Chappell,
G. D. Pettit,
期刊:
Applied Physics Letters
(AIP Available online 1986)
卷期:
Volume 48,
issue 7
页码: 475-477
ISSN:0003-6951
年代: 1986
DOI:10.1063/1.96535
出版商: AIP
数据来源: AIP
摘要:
We have unpinned the Fermi level at the surface of bothn‐ andp‐type (100) GaAs in air. Light‐induced photochemistry between GaAs and water unpins the surface Fermi level by reducing the surface state density. Excitation photoluminescence spectroscopy shows a substantial decrease in both surface band bending and surface recombination velocity in treated samples, consistent with a greatly reduced surface state density (&bartil;1011cm−2). Capacitance‐voltage measurements on metal‐insulator‐semiconductor structures corroborate this reduction in surface state density and show that the band bending may be controlled externally, indicating an unpinned Fermi level at the insulator/GaAs interface. We discuss a possible unpinning mechanism.
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