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Optical Properties of Quantum-Wires Grown Using Lateral Composition Modulation Induced by (InP)1/(GaP)1 Short-Period Superlattices

Published online by Cambridge University Press:  01 February 2011

J. D. Song ,
J. M. Kim  and
Y. T. Lee
J. D. Song
Affiliation:
Nano-device Research Center, KIST, Seoul 136–791, Korea
J. M. Kim
Affiliation:
Dept. of Information and Communications, K-JIST, Gwangju 500–712, Korea
Y. T. Lee
Affiliation:
Dept. of Information and Communications, K-JIST, Gwangju 500–712, Korea
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Abstract

The optical properties of quantum wires (QWRs) grown using lateral composition modulation (LCM) were studied by photoluminescence (PL) measurement as a function cryostat temperature (T cr ). 3 stacked arrays of QWRs were formed by sequential growth of ∼ 180 Å-thick LCM layers (lateral period: ∼ 90 Å) induced by (InP)1/(GaP)1 short-period superlattices, and 200 Å-thick InGaP spacers at the growth temperature of 490 °C. The formation of QWRs was confirmed by a transmission electron microscopy measurement. By the analysis of the dependence of PL intensity and peak energy of the QWRs on T cr , the origin of higher energy peak (H) and lower energy peak (L) were investigated. While behavior of the H peak is similar to that of an ordered InGaP, the L peak shows the insensitivity of PL peak energy to T cr . This is attributed to compensation of the bandgap by competition of strain in the QWR region and indicates the L peak is related to the QWRs. Strong dependence of the L peak on the position of polarizer also supports this. Additionally, the PL peak intensity of the L peak has the maximum value not at the lowest T cr (10 K) but at 50 K, while the H peak decrease continuously as T increases. We introduced the idea of compensation of the thermal expansion coefficient to explain this phenomenon.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 794: Symposium T – Self-Organized Processes in Semiconductor Heteroepitaxy , 2003 , T3.25
Copyright
Copyright © Materials Research Society 2004

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References

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