Growth and optical properties of ZnO/Zn1−xMgxO quantum wells on ZnO microrods. Issue 5 (18th January 2019)

• Record Type: Journal Article
• Authors: Pieniążek, Agnieszka; Teisseyre, Henryk; Jarosz, Dawid; Suffczyński, Jan; Witkowski, Bartłomiej S.; Kret, Sławomir; Boćkowski, Michał; Reszka, Anna; Godlewski, Marek; Kozanecki, Adrian; Kowalski, Bogdan J.
• Is Part Of: Nanoscale. Volume 11:Issue 5(2019)
• Page Start: 2275
• Page End: 2281
• Publication Date: 2019-01-18
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr07065b
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : PA-MBE growth of quantum structures on the top of hydrothermally grown ZnO microrods was successfully performed. 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− x Mg x O/ZnO/Zn1− x Mg x O 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.