Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
General route for the decomposition of InAs quantum dots during the capping process
Year:2016
Research Areas
  • Electronic technology and of the communications
Information
Abstract
The effect of the capping process on the morphology of InAs/GaAs quantum dots (QDs) by using different GaAs-based capping layers (CLs), ranging from strain reduction layers to strain compensating layers, has been studied by transmission microscopic techniques. For this, we have measured simultaneously the height and diameter in buried and uncapped QDs covering populations of hundreds of QDs that are statistically reliable. First, the uncapped QD population evolves in all cases from a pyramidal shape into a more homogenous distribution of buried QDs with a spherical-dome shape, despite the different mechanisms implicated in the QD capping. Second, the shape of the buried QDs depends only on the ?nal QD size, where the radius of curvature is function of the base diameter independently of the CL composition and growth conditions. An asymmetric evolution of the QDs? morphology takes place, in which the QD height and base diameter are modi?ed in the amount required to adopt a similar stable shape characterized by a averaged aspect ratio of 0.21. Our results contradict the traditional model of QD material redistribution from the apex to the base and point to a different universal behavior of the overgrowth processes in self-organized InAs QDs.
International
Si
JCR
Si
Title
Nanotechnology
ISBN
0957-4484
Impact factor JCR
3,573
Impact info
Datos JCR del año 2015
Volume
27
10.1088/0957-4484/27/12/125703
Journal number
From page
125703:1
To page
125703:8
Month
SIN MES
Ranking
Participants
  • Autor: D. González (UCA)
  • Autor: D.F. Reyes (UCA)
  • Autor: Antonio David Utrilla Lomas (UPM)
  • Autor: T. Ben (UCA)
  • Autor: V. Braza (UCA)
  • Autor: Alvaro de Guzman Fernandez Gonzalez (UPM)
  • Autor: Adrian Hierro Cano (UPM)
  • Autor: Jose Maria Ulloa Herrero (UPM)
Research Group, Departaments and Institutes related
  • Creador: Departamento: Ciencia de Materiales
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
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