NDLI: Optical Measurements and Theoretical Modelling of Excitons in Double ZnO/ZnMgO Quantum Wells in an Internal Electric Field

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Optical Measurements and Theoretical Modelling of Excitons in Double ZnO/ZnMgO Quantum Wells in an Internal Electric Field

Content Provider	MDPI
Author	Andrzejewski, Janusz Pietrzyk, Mieczyslaw Antoni Jarosz, Dawid Kozanecki, Adrian
Copyright Year	2021
Description	In this paper, the photoluminescence spectra of excitons in ZnO/ZnMgO/ZnO double asymmetric quantum wells grown on a–plane $Al2O3$ substrates with internal electric-field bands structures were studied. In these structures, the electron and the hole in the exciton are spatially separated between neighbouring quantum wells, by a ZnMgO barrier with different thickness. The existence of an internal electric field generates a linear potential and, as a result, lowers the energy of quantum states in the well. For the wide wells, the electrons are spatially separated from the holes and can create indirect exciton. To help the understanding of the photoluminescence spectra, for single particle states the 8 k·p for wurtzite structure is employed. Using these states, the exciton in the self-consistent model with 2D hydrogenic 1s–like wave function is calculated.
Starting Page	7222
e-ISSN	19961944
DOI	10.3390/ma14237222
Journal	Materials
Issue Number	23
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2021-11-26
Access Restriction	Open
Subject Keyword	Materials Semiconductors Zno Photoluminescence Excitons Effective-mass Theory
Content Type	Text
Resource Type	Article

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