Near field optical spectroscopy of GaN/AIN quantum dots

A Neogi, BP Gorman, H Morkoc, T Kawazoe, M Ohtsu, M Kuball

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

We investigate the spatial distribution and emission properties of self-assembled GaN/AlN quantum dots. High-resolution transmission electron microscopy reveals near vertical correlation among the GaN dots due to a sufficiently thin AlN spacer layer thickness, which allows strain induced stacking. Scanning electron and atomic force microscopy show lateral coupling due to a surface roughness of similar to 50-60 nm. Near-field photoluminescence in the illumination mode (both spatially and spectrally resolved) at 10 K revealed emission from individual dots, which exhibits size distribution of GaN dots from localized sites in the stacked nanostructure. Strong spatial localization of the excitons is observed in GaN quantum dots formed at the tip of self-assembled hexagonal pyramid shapes with six [1011] facets.
Translated title of the contributionNear field optical spectroscopy of GaN/AIN quantum dots
Original languageEnglish
Pages (from-to)317 - 322
JournalMaterial Research Society Symposium Proceedings
Volume831
Issue numberSymposium E – GaN, AlN, InN, and Their Alloys
Publication statusPublished - 2005

Bibliographical note

Editors: Wetzel C, Gil B, Kuzuhara M, Manfra M
ISBN: 1558997792
Publisher: Materials Research Society
Name and Venue of Conference: Symposium on GaN, AIN, InN and Their Alloys,2004 MRS Fall Meeting Boston
Conference Organiser: Materials Research Society

Structured keywords

  • CDTR

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