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

Abnormal photoluminescence for GaAs/Al 0.2 Ga 0.8 As quantum dot - ring hybrid nanostructure grown by droplet epitaxy

Su, Linlin, Liang, Baolai, Wang, Ying, Yuan, Qing, Guo, Qinglin, Wang, Shufang, Fu, Guangsheng, Huffaker, Diana, Mazur, Yuriy I., Ware, Morgan E., Maidaniuk, Yurii and Salamo, Gregory J. 2018. Abnormal photoluminescence for GaAs/Al 0.2 Ga 0.8 As quantum dot - ring hybrid nanostructure grown by droplet epitaxy. Journal of Luminescence 195 , pp. 187-192. 10.1016/j.jlumin.2017.11.008

[img]
Preview
PDF - Accepted Post-Print Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (900kB) | Preview

Abstract

The optical properties have been investigated for the GaAs/Al0.2Ga0.8As quantum dot-ring hybrid nanostructures grown by droplet epitaxy, in which each nanostructure consists of four quantum dots (QDs) sitting on a distinct ring of GaAs. A blueshift and narrowing of the photoluminescence (PL) spectra along with the nonlinear decay of the time-resolved PL curves of the QDs have been observed. These abnormal PL behaviors are caused by the unique state filling effect correlated with the quantum dot-ring structure feature, which is strongly affected by carrier transfer from smaller dots to larger dots via the wetting ring in the GaAs/Al0.2Ga0.8As hybrid structure.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Elsevier
ISSN: 0022-2313
Date of First Compliant Deposit: 22 November 2017
Date of Acceptance: 8 November 2017
Last Modified: 19 Oct 2019 06:32
URI: http://orca.cf.ac.uk/id/eprint/106937

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics