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Electrochemical Sulfur Treatments of GaAs Using Na2S and (NH4)2S Solutions: A Surface Chemical Study

Published online by Cambridge University Press:  22 February 2011

J. Yota  and
V. A. Burrows
J. Yota
Affiliation:
Department of Chemical, Bio, and Materials Engineering and Center for Solid State Electronics Research, Arizona State University, Tempe, Arizona 85287–6006
V. A. Burrows
Affiliation:
Department of Chemical, Bio, and Materials Engineering and Center for Solid State Electronics Research, Arizona State University, Tempe, Arizona 85287–6006
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Abstract

Chemical sulfur treatments of GaAs have been shown to improve the GaAs surface electronic properties. These treatments result in lower surface state density, lower surface recombination velocity, and shifting or unpinning of the Fermi level, in addition to improvement in the performance of devices. However, there is still considerable controversy regarding the chemical nature of the surface film which results from this chemical sulfidation. It has been shown that this film is not stable chemically and electronically. The improved surface electronic properties decay with time and are sensitive to the chemical environment of the material. In this study, using surface infrared reflection spectroscopy (SIRS) and x-ray photoelectron spectroscopy (XPS), we have investigated the electrochemical sulfidation of GaAs as a possible new method to produce a GaAs surface that is stable chemically and electronically. We have found that anodic treatments with Na2S and (NH4S solutions result in the removal of the pre-existing oxide of GaAs and the formation of films comprising sulfur, sodium carbonate, ammonium thiosulfate, and sulfide and sulfur-oxygen compounds of arsenic. Rinsing the GaAs with water removes the bulk of the film, leaving behind a surface on which only arsenic sulfide was detected.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 282: Symposium E – Chemical Perspectives of Microelectronic Materials III , 1992 , 105
Copyright
Copyright © Materials Research Society 1993

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References

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