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Correlation between Extended Defects and Surface Morphology in MBE Grown InAs/GaAs Heterostructures

Published online by Cambridge University Press:  21 February 2011

M.R. Bruni ,
G. Padeletti ,
M.G. Simeone ,
L. Francesio ,
P. Franzosi ,
S. Gennari ,
L. Nasi  and
G. Salviati
M.R. Bruni
Affiliation:
ICMAT-CNR Institute, I-00015, Monterotondo, Roma, Italy
G. Padeletti
Affiliation:
ICMAT-CNR Institute, I-00015, Monterotondo, Roma, Italy
M.G. Simeone
Affiliation:
ICMAT-CNR Institute, I-00015, Monterotondo, Roma, Italy
L. Francesio
Affiliation:
MASPEC-CNR Institute, Via Chiavari 18/A, 1-43100 Parma, Italy
P. Franzosi
Affiliation:
MASPEC-CNR Institute, Via Chiavari 18/A, 1-43100 Parma, Italy
S. Gennari
Affiliation:
MASPEC-CNR Institute, Via Chiavari 18/A, 1-43100 Parma, Italy
L. Nasi
Affiliation:
INFM, Physics Department, University of Parma, Viale delle Scienze, I-43100 Parma, Italy
G. Salviati
Affiliation:
MASPEC-CNR Institute, Via Chiavari 18/A, 1-43100 Parma, Italy
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Abstract

InAs single layers were grown by Molecular Beam Epitaxy on nominally (001) oriented GaAs substrates at growth temperatures ranging from 350 °C to 500 °C and thicknesses between 1 nm and 6 μm. A systematic study of the influence of growth temperature and thickness on crystal defects and surface morphology is discussed by comparing High Resolution X-Ray Diffraction, Transmission Electron Microscopy and Atomic Force Microscopy investigations.

Surface hexagonal shaped holes were observed to develop at the lowest temperatures starting from an heterolayer thickness of 50 nm. Both misfit and threading dislocations were revealed; moreover the correlation between hexagonal shaped surface holes and mixed dislocations, with the component of the Burgers vector (b) along the growth axis larger than the minimum interatomic distance, is discussed. The holes increase in size and decrease in density by increasing the layer thickness. An almost complete surface planarization is observed at a thickness of 6 μm by increasing the growth temperature up to 500 °C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 399: Symposium D – Evolution of Epitaxial Structure and Morphology , 1995 , 337
Copyright
Copyright © Materials Research Society 1996

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References

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