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Vacuum Electroreflectance: Overcoming the Difficulties of Electrolyte Electroreflectance and Photoreflectance

Published online by Cambridge University Press:  21 February 2011

Silvia L. Mioc ,
Paul M. Raccah  and
James W. Garland
Silvia L. Mioc
Affiliation:
University of Illinois at Chicago, Physics Department, PO Box 4348, M/C 273, Chicago, IL 60680
Paul M. Raccah
Affiliation:
University of Illinois at Chicago, Physics Department, PO Box 4348, M/C 273, Chicago, IL 60680
James W. Garland
Affiliation:
University of Illinois at Chicago, Physics Department, PO Box 4348, M/C 273, Chicago, IL 60680
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Abstract

A new technique for obtaining the electroreflectance (ER) spectrum, Vacuum Electroreflectance (VER), is introduced. In VER, the modulating electric field is applied capacitively using a transparent electrode as one plate and the sample as the other plate, with vacuum in between. In this geometry, cooling or heating is achieved without any sample preparation. Precise positioning is achieved by piezoelectric motors monitored by a HeNe interferometer, and cooling to 80 K by the Joule-Thompson effect. GaAs samples with different Si doping are used to compare VER to Electrolyte ER and Photoreflectance.

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References

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