Influence of carrier localization on photoluminescence emission from sub-monolayer quantum dot layers
We have investigated the origins of photoluminescence from quantum dot (QD) layers prepared by alternating depositions of sub-monolayers and a few monolayers of size-mismatched species, termed as sub-monolayer (SML) epitaxy, in comparison with their Stranski–Krastanov (SK) QD counterparts. Using measured nanostructure sizes and local In-compositions from local-electrode atom probe tomography as input into self-consistent Schrödinger–Poisson simulations, we compute the 3D confinement energies, probability densities, and photoluminescence (PL) spectra for both InAs/GaAs SML- and SK-QD layers. A comparison of the computed and measured PL spectra suggests one-dimensional electron confinement, with significant 3D hole localization in the SML-QD layers that contribute to their enhanced PL efficiency in comparison to their SK-QD counterparts.
Authors
- R. S. Goldman (ORCID: https://orcid.org/0000-0003-4470-1864)
- Thales Borrely (ORCID: https://orcid.org/0000-0003-4143-940X)
- A. A. Quivy (ORCID: https://orcid.org/0000-0002-6654-6239)
- Marcio Daldin Teodoro (ORCID: https://orcid.org/0000-0002-3557-5555)
- Ahmad Alzeidan
- Y.-C. Yang (ORCID: https://orcid.org/0009-0005-1057-7924)
- G. M. Jacobsen (ORCID: https://orcid.org/0000-0001-6364-4549)
- T.-Y. Huang (ORCID: https://orcid.org/0009-0009-9690-2677)
Institutions
- Universidade Federal de São Carlos (BR)
- Universidade de São Paulo (BR)
- University of Michigan (US)
Publication Details
- Journal
- Applied Physics Letters
- Published
- 2024-09-16
- DOI
- https://doi.org/10.1063/5.0219815
- Citations
- 3
- Primary Topic
- Semiconductor Quantum Structures and Devices
- Type
- article
- Field-Weighted Citation Impact
- 1.01
Funders
- National Science Foundation
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Horace H. Rackham School of Graduate Studies, University of Michigan
- Multidisciplinary University Research Initiative