Photoluminescence and photoluminescence excitation studies of lateral size effects in quantum disk samples of different radii

P. Klar, D. Wolverson, J. Davies, W. Heimbrodt, M. Happ

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Quantum disc structures (with diameters of 200 and 100 nm) were prepared from a (Formula presented) single quantum well structure by electron beam lithography followed by an etching procedure that combined dry and wet etching techniques. The quantum disc structures and the parent structure were studied by photoluminescence and photoluminescence excitation spectroscopy. For the light-hole excitons in the quantum well region, shifts of the energy positions are observed following fabrication of the discs, confirming that strain relaxation occurs in the pillars. The light-hole exciton lines also sharpen following disc fabrication: this is due to an interplay between strain effects (related to dislocations) and the lateral size of the discs. A further consequence of the small lateral sizes of the discs is that the intensity of the donor-bound exciton emission from the disc is found to decrease with the disc radius. These size-related effects occur before the disc radius is reduced to dimensions necessary for lateral quantum confinement to occur but will remain important when the discs are made small enough to be considered as quantum dots.

Original languageEnglish
Pages (from-to)7114-7118
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume57
Issue number12
DOIs
Publication statusPublished - 1 Jan 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Photoluminescence and photoluminescence excitation studies of lateral size effects in quantum disk samples of different radii'. Together they form a unique fingerprint.

Cite this