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The photoreflectance signal from GaN films is sensitive to the ambient medium. A large decrease in the photoreflectance amplitude is observed, when the ambient medium is changed from air to vacuum. This effect is attributed to ultraviolet-light-induced desorption of oxygen from the sample surface leading to a reduction of the surface barrier height. The effect is absent, when a thin Ti layer is deposited on top of the GaN film. A simple model is used to demonstrate that the surface photovoltage can be strongly reduced with a decrease of the surface barrier height. © 2000 American Institute of Physics.
Published in:
Journal of Applied Physics
(Volume:87
,
Issue:
9
)
Date of Publication: May 2000
- Page(s):
- 4315 - 4318
- ISSN :
- 0021-8979
- Digital Object Identifier :
- 10.1063/1.373071
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 18 June 2009
- Issue Date :
- May 2000
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