TITLE

Photoreflectance of GaAs/GaAlAs multiple quantum wells: Topographical variations in barrier height and well width

AUTHOR(S)
Parayanthal, P.; Shen, H.; Pollak, Fred H.; Glembocki, O. J.; Shanabrook, B. V.; Beard, W. T.
PUB. DATE
May 1986
SOURCE
Applied Physics Letters;5/12/1986, Vol. 48 Issue 19, p1261
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Using photoreflectance at room temperature we have evaluated the topographical variations in quantum level transitions of a GaAs/GaAlAs multiple quantum well (220 Å/150 Å) due to changes in barrier height and quantum well width. The spatial resolution of the measurement was about 100 μm. A key feature of our analysis is the ability to fit the electromodulation spectra by a third-derivative functional form line shape factor. We can detect barrier height changes of several millielectron volts and variations in well width as small as 2 Å.
ACCESSION #
9819764

 

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