Photoluminescence of compact GeSi quantum dot groups with increased probability of finding an electron in Ge.

Scientific Reports
A F ZinovievaA V Mudryi

Abstract

The photoluminescence (PL) of the combined Ge/Si structures representing a combination of large (200-250 nm) GeSi disk-like quantum dots (nanodisks) and four-layered stacks of compact groups of smaller (30 nm) quantum dots grown in the strain field of nanodisks was studied. The multiple increase in the PL intensity was achieved by the variation of parameters of vertically aligned quantum dot groups. The experimental results were analyzed on the basis of calculations of energy spectra, electron and hole wave functions. It was found that the quantum dot arrangement in compact groups provides the effective electron localization in Δx,y-valleys with an almost equal probability of finding an electron in the Si spacer and Ge barrier. As a result, the main channels of radiative recombination in the structures under study correspond to spatially direct optical transitions.

References

Mar 3, 2010·Optics Letters·Jifeng LiuJurgen Michel
May 9, 2012·Optics Express·Rodolfo E Camacho-AguileraJurgen Michel
Feb 4, 2014·Physical Review Letters·V A ZinovyevV A Armbrister
Jun 16, 2015·Optics Express·Roman KoernerJoerg Schulze
Mar 5, 2016·ACS Photonics·Martyna GrydlikMoritz Brehm
Oct 3, 2017·Nano Letters·Viktoriia RutckaiaJoerg Schilling
Dec 1, 2017·Nature Communications·Shuyu BaoDonguk Nam

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Citations

Jul 2, 2021·Scientific Reports·Ovidiu CojocaruMagdalena Lidia Ciurea

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Methods Mentioned

BETA
scanning tunneling microscopy
electron diffraction
atomic
transmission
X-ray

Software Mentioned

nextnano

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