Journal article
Correlation between overgrowth morphology and optical properties of single self-assembled InP quantum dots
Physical review. B, Condensed matter and materials physics, Vol.68(12), pp.1253031-1253039
09/15/2003
DOI: 10.1103/PhysRevB.68.125303
Abstract
We have studied the early stages of GaInP overgrowth on InP quantum dots (QD's) experimentally and theoretically. A direct correlation between the surface morphology and the optical properties of individual InP QD's is made using scanning tunneling microscopy (STM) and scanning tunneling luminescence. The geometric structure of the islands is further investigated using cross-sectional transmission electron microscopy (TEM). The overgrowth occurs in three stages; initially the InP QD's act as seeding points for the overgrowth, where the GaInP grows laterally from the side facets of the QD. The growth occurs preferentially in the [110] direction and elongated GaInP/InP islands are formed. As the overgrowth continues the islands increase laterally in size and GaInP also starts to grow between the islands, but not covering the top of the InP QD's. The growth of GaInP on top of the QD's commences once the islands have begun to coalesce. Using a model based on the STM and TEM results the electronic structures of the QD's have been calculated by eight-band k.p theory. The calculations are in good agreement with the experimental results. Our findings unravel the details of the strain induced energy shift of the QD luminescence previously reported [Pistol , Appl. Phys. Lett. 67, 1438 (1995)].
Details
- Title: Subtitle
- Correlation between overgrowth morphology and optical properties of single self-assembled InP quantum dots
- Creators
- Mikael Johansson - Lund UniversityUlf Håkanson - Lund UniversityMagnus Holm - Lund UniversityJonas Persson - Lund UniversityT Sass - Lund UniversityJonas Johansson - Lund UniversityC Pryor - University of IowaLars Montelius - Lund UniversityWerner Seifert - Lund UniversityLars Samuelson - Lund UniversityMats-Erik Pistol - Lund University
- Resource Type
- Journal article
- Publication Details
- Physical review. B, Condensed matter and materials physics, Vol.68(12), pp.1253031-1253039
- DOI
- 10.1103/PhysRevB.68.125303
- ISSN
- 1098-0121
- eISSN
- 1550-235X
- Language
- English
- Date published
- 09/15/2003
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984429029202771
Metrics
1 Record Views