RT journal article
T1 Exploring the Implementation of GaAsBi Alloys as Strain-Reducing Layers in InAs/GaAs Quantum Dots
A1 Braza Blanco, María Verónica
A1 Fernández de los Reyes, Daniel
A1 Ben Fernández, Teresa
A1 Flores Gallegos, Sara
A1 Bailey, Nicholas James
A1 Carr, Matthew
A1 Richards, Robert
A1 González Robledo, David
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 GaAsBi capping
K1 self-assembled InAs QDs
K1 STEM compositional analyses
AB This paper investigates the effect of GaAsBi strain reduction layers (SRLs) on InAs QDswith different Bi fluxes to achieve nanostructures with improved temperature stability. The SRLs aregrown at a lower temperature (370 ◦C) than the usual capping temperature for InAs QDs (510 ◦C).The study finds that GaAs capping at low temperatures reduces QD decomposition and leads tolarger pyramidal dots but also increases the threading dislocation (TD) density. When adding Bi to thecapping layer, a significant reduction in TD density is observed, but unexpected structural changesalso occur. Increasing the Bi flux does not increase the Bi content but rather the layer thickness. Themaximum Bi content for all layers is 2.4%. A higher Bi flux causes earlier Bi incorporation, along withthe formation of an additional InGaAs layer above the GaAsBi layer due to In segregation from QDerosion. Additionally, the implementation of GaAsBi SRLs results in smaller dots due to enhancedQD decomposition, which is contrary to the expected function of an SRL. No droplets were detectedon the surface of any sample, but we did observe regions of horizontal nanowires within the epilayersfor the Bi-rich samples, indicating nanoparticle formation.
PB MDPI
SN 2079-4991
YR 2024
FD 2024
LK http://hdl.handle.net/10498/32866
UL http://hdl.handle.net/10498/32866
LA eng
NO This research was co-funded by the Spanish National Research Agency(AEI/10.13039/501100011033), the European Union under the 2014–2020 ERDF Operational Program,Regional Government of Andalusia (project ProyExcel_01013) and the European Social Fund andMinistry of Economic Transformation, Industry, Knowledge, and Universities of Regional Government of Andalusia, PAIDI2020 (DOC_01360). The work of R.R. was supported by the Royal Academyof Engineering under the Research Fellowships scheme
DS Repositorio Institucional de la Universidad de Cádiz
RD 08-nov-2026