Site- And energy-controlled pyramidal quantum dot heterostructures

E. Kapon, E. Pelucchi, S. Watanabe, A. Malko, M. H. Baier, K. Leifer, B. Dwir, F. Michelini, M. A. Dupertuis

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

The formation mechanisms, structure and optoelectronic properties of Ga(In)As/(Al)GaAs quantum dot (QD) heterostructures grown by organometallic chemical vapor deposition on patterned (111)B GaAs substrates are reviewed. With this approach, it is possible to prepare high-quality semiconductor QDs whose position on a substrate is precisely controlled via a pre-growth photolithography step. The dots are formed at the center of an inverted, tetrahedral pyramid and are surrounded by distinct, low-dimensional barriers (quantum wires and quantum wells). Reproducible neutral and charged exciton states are observed in the QDs and are probed using microphotoluminescence and photon correlation spectroscopy. Single- and correlated-photon emissions are systematically detected from specific single and biexciton states. The emission spectra of light emitting diodes incorporating single pyramidal dots indicate the possibility of preferential injection of charge carriers via self-ordered wires connected to the dots. Finally, photonic crystal structures incorporating pyramidal QDs with controlled energy states are demonstrated.

Original languageEnglish
Pages (from-to)288-297
Number of pages10
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume25
Issue number2-3 SPEC.ISS.
DOIs
Publication statusPublished - 2004 Nov 1
Externally publishedYes

Keywords

  • Cathodoluminescence
  • Excitons
  • Organometallic chemical vapor deposition (OMCVD)
  • Photoluminescence
  • Photon correlation
  • Photonic crystals
  • Pyramidal quantum dots
  • Self-ordering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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