Optical and structural properties of InGaSb/GaAs quantum dots grown by molecular beam epitaxy

Hodgson, Peter David and Bentley, Matthew and Delli, Evangelia and Beanland, R and Wagener, Magnus C. and Botha, Johannes Reinhardt and Carrington, Peter James (2018) Optical and structural properties of InGaSb/GaAs quantum dots grown by molecular beam epitaxy. Semiconductor Science and Technology, 33 (12): 125021. ISSN 0268-1242

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We present the results of an investigation into the growth of InGaSb/GaAs quantum dots (QDs) by molecular beam epitaxy using migration-enhanced epitaxy. Surface atomic force microscopy and cross-sectional transmission electron microscopy show that the QDs undergo a significant change in morphology upon capping with GaAs. A GaAs ‘cold capping’ technique was partly successful in preserving QD morphology during this process, but strong group V intermixing was still observed. Energy-dispersive x-ray spectroscopy reveals that the resulting nanostructures are small ‘core’ QDs surrounded by a highly intermixed disc. Temperature varying photoluminescence measurements indicate strong light emission from the QDs, with an emission wavelength of 1230 nm at room temperature. Nextnano 8x8 k.p calculations show good agreement with the PL results and indicate a low level of group-V intermixing in the core QD.

Item Type:
Journal Article
Journal or Publication Title:
Semiconductor Science and Technology
Uncontrolled Keywords:
?? materials chemistryelectronic, optical and magnetic materialselectrical and electronic engineeringcondensed matter physics ??
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Deposited On:
03 Oct 2018 15:06
Last Modified:
15 Jul 2024 18:24