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Issue 5, 2019
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Growth and optical properties of ZnO/Zn1−xMgxO quantum wells on ZnO microrods

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Abstract

While synthesis methods for pure ZnO nanostructures are well established, an efficient technique for the growth of ZnO-based nanowires or microrods that incorporate any type of quantum structure is yet to be established. Here, we report on the fabrication and optical properties of axial Zn1−xMgxO/ZnO/Zn1−xMgxO quantum wells that were deposited by molecular beam epitaxy on ZnO microrods obtained using a hydrothermal method. Using the emission energy results found in cathodoluminescence measurements and the results of a numerical modeling process, we found the quantum well width to be 4 nm, as intended, at the growth stage. The emission of quantum well-confined excitons persists up to room temperature. We used the fabricated structures to determine the carrier diffusion length (>280 nm) in ZnO using spatially resolved cathodoluminescence. The micro-photoluminescence results suggest an increase in the electron–phonon coupling strength with increasing microrod size.

Graphical abstract: Growth and optical properties of ZnO/Zn1−xMgxO quantum wells on ZnO microrods

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Article information


Submitted
30 Aug 2018
Accepted
12 Nov 2018
First published
27 Nov 2018

Nanoscale, 2019,11, 2275-2281
Article type
Paper

Growth and optical properties of ZnO/Zn1−xMgxO quantum wells on ZnO microrods

A. Pieniążek, H. Teisseyre, D. Jarosz, J. Suffczyński, B. S. Witkowski, S. Kret, M. Boćkowski, A. Reszka, M. Godlewski, A. Kozanecki and B. J. Kowalski, Nanoscale, 2019, 11, 2275
DOI: 10.1039/C8NR07065B

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