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Excitation Intensity Driven PL Shifts of SiGe Islands on Patterned and Planar Si(001) Substrates: Evidence for Ge-rich Dots in Islands

For randomly nucleated SiGe/Si(001) islands, a significantly stronger blue-shift of the PL spectra as a function of the excitation intensity is observed when compared to islands grown on patterned substrates side by side within the same run in a solid source molecular beam epitaxy chamber. We ascrib...

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Autores principales: Brehm, M, Grydlik, M, Hackl, F, Lausecker, E, Fromherz, T, Bauer, G
Formato: Texto
Lenguaje:English
Publicado: Springer 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2991224/
https://www.ncbi.nlm.nih.gov/pubmed/21170407
http://dx.doi.org/10.1007/s11671-010-9713-z
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author Brehm, M
Grydlik, M
Hackl, F
Lausecker, E
Fromherz, T
Bauer, G
author_facet Brehm, M
Grydlik, M
Hackl, F
Lausecker, E
Fromherz, T
Bauer, G
author_sort Brehm, M
collection PubMed
description For randomly nucleated SiGe/Si(001) islands, a significantly stronger blue-shift of the PL spectra as a function of the excitation intensity is observed when compared to islands grown on patterned substrates side by side within the same run in a solid source molecular beam epitaxy chamber. We ascribe this different PL behavior to the much larger inhomogeneity of the Ge distribution in islands on planar substrates when compared to islands grown on pit-patterned ones, as observed previously. 3D band-structure calculations show that Ge-rich inclusions of approximately 5 nm diameter at the apex of the islands can account for the observed differences in the PL spectra. The existence of such inclusions can be regarded as a quantum dot in an island and is in agreement with recent nano-tomography experiments.
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spelling pubmed-29912242010-12-15 Excitation Intensity Driven PL Shifts of SiGe Islands on Patterned and Planar Si(001) Substrates: Evidence for Ge-rich Dots in Islands Brehm, M Grydlik, M Hackl, F Lausecker, E Fromherz, T Bauer, G Nanoscale Res Lett Special Issue Article For randomly nucleated SiGe/Si(001) islands, a significantly stronger blue-shift of the PL spectra as a function of the excitation intensity is observed when compared to islands grown on patterned substrates side by side within the same run in a solid source molecular beam epitaxy chamber. We ascribe this different PL behavior to the much larger inhomogeneity of the Ge distribution in islands on planar substrates when compared to islands grown on pit-patterned ones, as observed previously. 3D band-structure calculations show that Ge-rich inclusions of approximately 5 nm diameter at the apex of the islands can account for the observed differences in the PL spectra. The existence of such inclusions can be regarded as a quantum dot in an island and is in agreement with recent nano-tomography experiments. Springer 2010-08-05 /pmc/articles/PMC2991224/ /pubmed/21170407 http://dx.doi.org/10.1007/s11671-010-9713-z Text en Copyright © 2010 The Author(s) https://creativecommons.org/licenses/by-nc/4.0/ This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
spellingShingle Special Issue Article
Brehm, M
Grydlik, M
Hackl, F
Lausecker, E
Fromherz, T
Bauer, G
Excitation Intensity Driven PL Shifts of SiGe Islands on Patterned and Planar Si(001) Substrates: Evidence for Ge-rich Dots in Islands
title Excitation Intensity Driven PL Shifts of SiGe Islands on Patterned and Planar Si(001) Substrates: Evidence for Ge-rich Dots in Islands
title_full Excitation Intensity Driven PL Shifts of SiGe Islands on Patterned and Planar Si(001) Substrates: Evidence for Ge-rich Dots in Islands
title_fullStr Excitation Intensity Driven PL Shifts of SiGe Islands on Patterned and Planar Si(001) Substrates: Evidence for Ge-rich Dots in Islands
title_full_unstemmed Excitation Intensity Driven PL Shifts of SiGe Islands on Patterned and Planar Si(001) Substrates: Evidence for Ge-rich Dots in Islands
title_short Excitation Intensity Driven PL Shifts of SiGe Islands on Patterned and Planar Si(001) Substrates: Evidence for Ge-rich Dots in Islands
title_sort excitation intensity driven pl shifts of sige islands on patterned and planar si(001) substrates: evidence for ge-rich dots in islands
topic Special Issue Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2991224/
https://www.ncbi.nlm.nih.gov/pubmed/21170407
http://dx.doi.org/10.1007/s11671-010-9713-z
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