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Near-Field Scanning Optical Microscopy of Phase Separation Effects in Dilute Nitride Alloys.

Published online by Cambridge University Press:  01 February 2011

Alexander Mintairov ,
Thomas Kosel ,
Kai Sun ,
Victor Ustinov  and
James Merz
Alexander Mintairov
Affiliation:
Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
Thomas Kosel
Affiliation:
Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
Kai Sun
Affiliation:
Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
Victor Ustinov
Affiliation:
Ioffe Physico-Technical Institute, RAS, St. Petersburg 194021, Russia
James Merz
Affiliation:
Department of Electrical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
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Abstract

The effect of nitrogen composition on structural parameters of intrinsic quantum dots (QDs) has been studied in GaAs1-yNy and InxGa1-xAs1-yNy alloys (y∼0. 015–0.03) using low-temperature near-field scanning optical microscopy (NSOM) combined with magneto-photoluminescence spectroscopy. We used measurements of the diamagnetic shift (magnetic field strength 0–10T), temperature dependent spectra (temperature range 5–300K) and near-field monochromatic images for the estimation of the size, nitrogen excess and density of QDs. The obtained values (size ∼10–30 nm, nitrogen excess ∼0.005 and density ∼100 /μm-3) suggest spontaneous formation (phase separation) of QDs. Strong lateral inhomogeniety of the QD distribution on a micron length scale was observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 838: Symposium O – Scanning Probe and Other Novel Microscopies of Local Phenomena in Nanostructured Materials , 2004 , O3.1
Copyright
Copyright © Materials Research Society 2005

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References

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