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Related Experiment Videos

Self-assembling of In(Ga)As/GaAs quantum dots on (N11) substrates: the (311)A case

Sanguinetti1, Chiantoni, Miotto

  • 1I.N.F.M., Universita di Milano Bicocca, Italy. stefano.sanguinetti@mater.unimb.it

Micron (Oxford, England : 1993)
|March 7, 2000
PubMed
Summary

We investigated Indium Gallium Arsenide (InGaAs) island formation on Gallium Arsenide (GaAs) substrates. Substrate orientation influences island shape, resulting in quantum wire-like structures and anisotropic quantum dots (QDs).

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Investigating Indium Gallium Arsenide (InGaAs) island formation is crucial for understanding quantum structures.
  • The Stranski-Krastanov growth mode is a key mechanism for creating self-assembled quantum dots (QDs) and quantum wires.
  • Gallium Arsenide (GaAs) substrates with specific crystallographic orientations, such as (311)A, can influence nanostructure morphology.

Purpose of the Study:

  • To explore the formation of In(Ga)As islands on (311)A GaAs substrates using the Stranski-Krastanov growth mode.
  • To analyze the impact of substrate orientation on the shape and morphology of InAs and InGaAs nanostructures.
  • To correlate the optical properties with the morphological characteristics of the resulting quantum structures.

Main Methods:

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  • Utilizing contact microscopy techniques to study the surface topography of InAs and InGaAs strained epilayers.
  • Employing photoluminescence (PL) measurements to characterize the optical properties of quantum dot (QD) samples.
  • Comparing nanostructure formation on different substrate orientations.

Main Results:

  • In(Ga)As grown on (311)A GaAs substrates results in quantum wire-like island formation.
  • Deposition of InAs leads to the formation of quantum dots (QDs) with highly anisotropic shapes.
  • A clear correlation was observed between the optical emission spectra and the morphological properties of the nanostructures.

Conclusions:

  • Substrate orientation significantly affects the shape of overgrown In(Ga)As islands.
  • The study demonstrates the formation of anisotropic quantum dots and quantum wire-like structures on (311)A GaAs.
  • Observed correlations highlight the interplay between morphology and optical behavior in these nanostructures.