Epitaxial GaAs/AlGaAs core-multishell nanowires with enhanced photoluminescence lifetime

Chen Zhou, Xu Tao Zhang, Kun Zheng, Ping Ping Chen, Syo Matsumura, Wei Lu, Jin Zou

Research output: Contribution to journalArticle

Abstract

The modulation of complex GaAs/AlGaAs core-shell nanowire heterostructures by the process of embedding GaAs quantum wells or AlGaAs quantum dots is feasible due to their minor lattice mismatch. In this study, we have grown GaAs/AlGaAs core-multishell nanowire heterostructures by molecular beam epitaxy and investigated their structural and optical characteristics. Our advanced electron microscopy investigations confirmed that we have grown wurtzite-structured GaAs/AlGaAs core-multishell nanowires, in which the AlGaAs inner-shell with a high Al concentration acts as a quantum barrier for the GaAs nanowire core and AlGaAs outer-shell. Photoluminescence measurements show that this unique nanowire heterostructure has a significantly increased carrier lifetime compared to the conventional GaAs/AlGaAs core-shell nanowire heterostructures. The observed prolonged carrier lifetime can be attributed to the increased electron confinement at the core-inner-shell interface and thus the delayed recombination of photoexcited electron-hole pairs. This study provides a possible design of nanowire heterostructures for high-efficiency optoelectronic devices.

Original languageEnglish
Pages (from-to)6859-6865
Number of pages7
JournalNanoscale
Volume11
Issue number14
DOIs
Publication statusPublished - Apr 14 2019

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Nanowires
Photoluminescence
Heterojunctions
Carrier lifetime
Lattice mismatch
Electrons
gallium arsenide
Molecular beam epitaxy
Optoelectronic devices
Semiconductor quantum wells
Electron microscopy
Semiconductor quantum dots
Modulation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Epitaxial GaAs/AlGaAs core-multishell nanowires with enhanced photoluminescence lifetime. / Zhou, Chen; Zhang, Xu Tao; Zheng, Kun; Chen, Ping Ping; Matsumura, Syo; Lu, Wei; Zou, Jin.

In: Nanoscale, Vol. 11, No. 14, 14.04.2019, p. 6859-6865.

Research output: Contribution to journalArticle

Zhou, C, Zhang, XT, Zheng, K, Chen, PP, Matsumura, S, Lu, W & Zou, J 2019, 'Epitaxial GaAs/AlGaAs core-multishell nanowires with enhanced photoluminescence lifetime', Nanoscale, vol. 11, no. 14, pp. 6859-6865. https://doi.org/10.1039/c9nr01715a
Zhou, Chen ; Zhang, Xu Tao ; Zheng, Kun ; Chen, Ping Ping ; Matsumura, Syo ; Lu, Wei ; Zou, Jin. / Epitaxial GaAs/AlGaAs core-multishell nanowires with enhanced photoluminescence lifetime. In: Nanoscale. 2019 ; Vol. 11, No. 14. pp. 6859-6865.
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