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 ORCID: https://orcid.org/0000-0001-5946-4481, 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

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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:	18 Nov 2024 16:45
URI:	https://orca.cardiff.ac.uk/id/eprint/106937

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