Probing interface roughness of the GaAs/Al0.3Ga0.7As multi-quantum-well structures using low-temperature photoluminescence spectra

T. Maitra, S. Mukherjee, A. Pradhan, S. Mukherjee, A. Nayak, S. Bhunia

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The optical properties of Metalorganic vapour phase epitaxy (MOVPE) grown GaAs/Al0.3Ga0.7As multi-quantum-well structure have been investigated with the help of both room temperature (300 K) and low temperature (4 K) photoluminescence (PL) technique. The morphology of the grown heterostructure has been evaluated from the cross-sectional transmission electron microscopy (XTEM) measurements. We have observed three distinct PL peaks at 1.5672 eV, 1.6047 eV and 1.677 eV corresponding to the three quantum wells at 4 K which exhibited significant quantum shift due to the confinement of the carriers in the respective quantum wells. The plot of quantum shift as function of well width shows that the shift being largest for the thinnest quantum well. A model is further employed to correlate the interface roughness in terms of the obtained line widths of the PL spectra. From this model, the interface roughness due to the three quantum wells viz. 84 Å, 64 Å, and 44 Å, are 13.17 Å, 10.41 Å and 8.66 Å, respectively.

Original languageEnglish
Title of host publication3rd International Conference on Condensed Matter and Applied Physics, ICC 2019
EditorsManoj Singh Shekhawat, Sudhir Bhardwaj, Bhuvneshwer Suthar
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735419766
DOIs
StatePublished - 4 May 2020
Externally publishedYes
Event3rd International Conference on Condensed Matter and Applied Physics, ICC 2019 - Bikaner, India
Duration: 14 Oct 201915 Oct 2019

Publication series

NameAIP Conference Proceedings
Volume2220
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd International Conference on Condensed Matter and Applied Physics, ICC 2019
Country/TerritoryIndia
CityBikaner
Period14/10/1915/10/19

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