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Spatially Resolved Photoluminescence in Spontaneously-ordered GaInP2

Published online by Cambridge University Press:  10 February 2011

S. Smith ,
A. Mascarenhas ,
J. M. Olson  and
L. L. Kazmerski
S. Smith
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
A. Mascarenhas
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
J. M. Olson
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
L. L. Kazmerski
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
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Abstract

The low-temperature (5K) photoluminescence (PL) of partially-ordered GaInP2 is spatially resolved using high-resolution (from ˜ 0.2μm-0.7μm) scanning optical microscopy, revealing the spatial variation in band gap energy and the spatial origin of the ordering-induced low-energy emission and the associated ‘quantum-dot-like’ narrow spikes which appear when examining areas smaller, or of comparable size, than a single ordered domain. The large number of spectra taken within a micronsized area allow a detailed look at the statistical variation in band-gap energy and lineshape. A systematic study of a series of samples where the order parameter varies from η ˜ 0 to 0.45 shows that for the most highly-ordered samples, the statisitical distribution of excitonic energy and linewidth show evidence of exciton localization, which is also clearly seen by examining the spatial maps of the excitornic energy and linewidth extracted from the measured spectra.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 583 , 1999 , 211
Copyright
Copyright © Materials Research Society 2000

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References

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