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Experimental and theoretical analysis of influence of barrier composition on optical properties of GaN/AlGaN multi-quantum wells: Temperature- and pressure-dependent photoluminescence studies

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dc.abstract.enStudies of internal electric fields in GaN/AlxGa1-xN (3 nm/4 nm) multi-quantum-wells (MQWs) with x = 0.25, 0.5, and 1 are presented. The structures were grown by plasma-assisted molecular-beam epitaxy and characterized by x-ray diffraction, transmission electron microscopy, and secondary ion mass spectroscopy. Optical properties of these structures were investigated by ambient and high-pressure photoluminescence (PL) measurements. They were strongly affected by polarization-induced electric fields giving rise to a quantum confined Stark effect, depending on the composition of the AlGaN barrier. The optical emission energy redshifts by > 100 meV when the Al content in the barrier increases from x = 0.25 up to x = 1, while the pressure coefficients of the PL energy are significantly reduced in comparison with bulk GaN. The transition energies and their pressure dependencies are modelled for tetragonally strained structures with the same geometry using a full tensorial representation of the strain in the MQWs under external pressure. The same MQWs are also simulated using density functional theory calculations. Additionally, influence of blurring of well-barrier interface on transition energy has been modelled. A good agreement between experimental results and theoretical analysis indicates that nonlinear effects induced by the tetragonal strain due to the lattice mismatch between the substrates and the polar MQWs are responsible for a drastic decrease of the pressure coefficients of PL energy, and that these effects are well described by ab initio calculation procedures. Our results reflect the role of composition and geometry on the basic optical properties of nitride quantum wells. (C) 2018 Elsevier B.V. All rights reserved.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorWierzbicka, Aleksandra
dc.contributor.authorMonroy, Eva
dc.contributor.authorSobczak, Kamil
dc.contributor.authorJakieła, Rafał
dc.contributor.authorStrąk, Paweł
dc.contributor.authorKłosek, Kamil
dc.contributor.authorBorysiuk, Jolanta
dc.contributor.authorGrzanka, Ewa
dc.contributor.authorSobańska, Marta
dc.contributor.authorŻytkiewicz, Zbigniew
dc.contributor.authorKamińska, Agata
dc.contributor.authorKrukowski, Stanisław
dc.contributor.authorKoroński, Kamil
dc.date.accessioned2024-01-25T00:07:49Z
dc.date.available2024-01-25T00:07:49Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.volume769
dc.identifier.doi10.1016/J.JALLCOM.2018.08.050
dc.identifier.issn0925-8388
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/106747
dc.identifier.weblinkhttps://www.sciencedirect.com/science/article/pii/S0925838818329244?via%3Dihub
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofJournal of Alloys and Compounds
dc.relation.pages1064-1071
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleExperimental and theoretical analysis of influence of barrier composition on optical properties of GaN/AlGaN multi-quantum wells: Temperature- and pressure-dependent photoluminescence studies
dc.typeJournalArticle
dspace.entity.typePublication