Hole confinement in quantum islands in Ga(AsSb)/GaAs/(AlGa)As heterostructures

S. Horst, S. Chatterjee, K. Hantke, P. J. Klar, C. Lange, I. Nemeth, M. Schwalm, W. Stolz, K. Volz, C. Bückers, A. Thränhardt, S. W. Koch, W. Rühle, Shane Johnson, J. B. Wang, Yong-Hang Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The optical emission and gain properties of Ga(AsSb) quantum-islands are investigate. These islands form during growth in a self-organized process in a series of Ga(AsSb)/GaAs/(AlGa)As heterostructures, resulting in an additional in-plane hole confinement of several hundreds of meV. The shape of the in-plane confinement potential is nearly parabolic and thus yields almost equidistant hole energy levels. Transmission electron microscopy reveals that the quantum islands are 100nm in diameter and exhibit an in-plane variation of the Sb concentration of more than 30 %. Up to seven bound hole states are observed in the photoluminescence spectra. Time-resolved photoluminescence data are shown as function of excitation density, lattice temperature, and excitation photon energy and reveal fast carrier capture into and relaxation within the quantum islands. Furthermore, the optical gain is measured using the variable stripe-length method and the advantages of such structures as active laser material are discussed.

Original languageEnglish (US)
Title of host publicationUltrafast Phenomena in Semiconductors and Nanostructure Materials XIII
StatePublished - 2009
EventUltrafast Phenomena in Semiconductors and Nanostructure Materials XIII - San Jose, CA, United States
Duration: Jan 25 2009Jan 29 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherUltrafast Phenomena in Semiconductors and Nanostructure Materials XIII
Country/TerritoryUnited States
CitySan Jose, CA


  • Antimony
  • Dots
  • Photoluminescence
  • Spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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