Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Density dependent composition of InAs quantum dots extracted from grazing incidence x-ray diffraction measurements

Sharma, Manjula, Sanyal, Milan K., Farrer, Ian, Ritchie, David A., Dey, Arka B., Bhattacharyya, Arpan, Seeck, Oliver H., Skiba-Szymanska, Joanna, Felle, Martin, Bennett, Anthony and Shields, Andrew J. 2015. Density dependent composition of InAs quantum dots extracted from grazing incidence x-ray diffraction measurements. Scientific Reports 5 , 15732. 10.1038/srep15732

[img]
Preview
PDF - Published Version
Available under License Creative Commons Attribution.

Download (2MB) | Preview

Abstract

Epitaxial InAs quantum dots grown on GaAs substrate are being used in several applications ranging from quantum communications to solar cells. The growth mechanism of these dots also helps us to explore fundamental aspects of self-organized processes. Here we show that composition and strain profile of the quantum dots can be tuned by controlling in-plane density of the dots over the substrate with the help of substrate-temperature profile. The compositional profile extracted from grazing incidence x-ray measurements show substantial amount of inter-diffusion of Ga and In within the QD as a function of height in the low-density region giving rise to higher variation of lattice parameters. The QDs grown with high in-plane density show much less spread in lattice parameter giving almost flat density of In over the entire height of an average QD and much narrower photoluminescence (PL) line. The results have been verified with three different amounts of In deposition giving systematic variation of the In composition as a function of average quantum dot height and average energy of PL emission.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 27 November 2017
Date of Acceptance: 28 September 2015
Last Modified: 27 Nov 2017 15:17
URI: http://orca-mwe.cf.ac.uk/id/eprint/106441

Citation Data

Cited 3 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics