Optical spectroscopy of GaSb/GaAs self-assembled quantum dots grown by MOCVD

Motlan, E. M. Goldys, K. S A Butcher, T. L. Tansley

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

1 Downloads (Pure)


We report results for optical spectroscopy of GaSb self-assembled quantum dots (QDs) grown by metalorganic chemical vapour deposition (MOCVD) on GaAs substrates. We examined the QD emission by room temperature cathodoluminescence (CL) and low temperature photoluminescence (PL). In samples grown for 3, 5, and 7 seconds cathodoluminescence spectra show evidence of quantum confinement with peaks shifted to higher energies of 0.95, 1, and 1.05 eV respectively, reflecting the decreasing average size of the dots grown at longer times. The cathodoluminescence emission intensity of the quantum dots depends on the electron excitation voltage of between 15 kV and 35 kV. It also varies with beam current density and this variation is related to the generation of secondary electrons in the GaAs barrier. The cathodoluminescence signal is also confirmed by photoluminescence studies.

Original languageEnglish
Title of host publicationCOMMAD 2000 Proceedings - Conference on Optoelectronic and Microelectronic Materials and Devices
EditorsLeonard Broekman, Brian Usher, John Riley
Place of PublicationBundoora, Victoria, Australia
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages4
ISBN (Print)0780366980
Publication statusPublished - 2000
EventConference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2000 - Bundoora, Australia
Duration: 6 Dec 20008 Dec 2000


OtherConference on Optoelectronic and Microelectronic Materials and Devices, COMMAD 2000

Bibliographical note

Copyright 2002 IEEE. Reprinted from Proceedings of the 2000 conference on optoelectronic and microelectronic materials and devices. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Macquarie University’s products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to pubs-permissions@ieee.org. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Fingerprint Dive into the research topics of 'Optical spectroscopy of GaSb/GaAs self-assembled quantum dots grown by MOCVD'. Together they form a unique fingerprint.

Cite this