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Growth and optical properties of ZnO/Zn1-xMgxO quantum well on ZnO microrod

Abstract

While synthesis methods for pure ZnO nanostructures are well established, an efficient technique for growth of ZnO-based nanowires or microrods that incorporate any type of quantum structure has still to be established. Here, we report on the fabrication and the optical properties of an axial Zn1−xMgxO/ZnO/Zn1-xMgxO quantum well that was deposited by molecular beam epitaxy on a ZnO microrod obtained using a hydrothermal method. Using the emission energy results found in cathodoluminescence measurements and the results of a numerical modeling process, we determine 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 use the fabricated structure to determine the carrier diffusion length (>280 nm) in ZnO using spatially resolved cathodoluminescence. Micro-photoluminescence results suggest an increase in the electron-phonon coupling strength with increasing microrod size.

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Publication details

The article was received on 30 Aug 2018, accepted on 12 Nov 2018 and first published on 27 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR07065B
Citation: Nanoscale, 2018, Accepted Manuscript
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    Growth and optical properties of ZnO/Zn1-xMgxO quantum well on ZnO microrod

    A. Pieniążek, H. Teisseyre, D. Jarosz, J. Suffczynski, B. S. Witkowski, S. Kret, M. Bockowski, A. Reszka, M. Godlewski, A. Kozanecki and B. J. Kowalski, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR07065B

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