Modeling of polarization reversal-induced interface sheet charge in wurtzite-type AlScN/GaN heterostructures

Abstract: In this work, the value and the polarity of the spontaneous and piezoelectric polarization have been investigated, as the use of two different
reference structures for wurtzite-type group-III nitrides, namely, the zinc-blende and the layered-hexagonal crystal lattice, have resulted in
different predictions. It was found that although the differences in value and polarity of the polarization for heterostructures such as wurtzite
Al 1−xScxN/GaN lead to similar interface sheet charges, a significant mismatch is observed when polarization reversal is considered. The
interface sheet charge predicted before and after the polarization reversal in the wurtzite Al1−xScxN layer on GaN using the zinc-blende
lattice as a reference predominantly shows a change in sign. When using the layered-hexagonal lattice as a reference, not only is the same
polarity of the interface sheet charge maintained after polarization reversal, but it is even 30 times larger. In this case, the giant and positive
spontaneous polarization values for metal-polar Al 1−xScxN extracted from the ferroelectric switching, as well as the alignment of the piezo-
electric polarization to it, were observed to be consistent with the predictions referenced to the layered-hexagonal lattice. Thus, it is con-
cluded that the layered-hexagonal reference is not only more suitable for predicting the ferroelectric properties of wurtzite Al 1−xScxN but
should also be the correct reference when considering polarization reversal in heterostructures. If the significant increase in the interface
sheet charge after polarization reversal is experimentally detected, it will allow the design and fabrication of novel devices for future high-
frequency and power electronics applications

Standort
Deutsche Nationalbibliothek Frankfurt am Main
Umfang
Online-Ressource
Sprache
Englisch
Anmerkungen
Journal of applied physics. - 135, 15 (2024) , 155702, ISSN: 1089-7550

Schlagwort
Nitride
Ferroelektrische Heterostruktur

Ereignis
Veröffentlichung
(wo)
Freiburg
(wer)
Universität
(wann)
2024
Urheber
Yassine, Mohamed
Yassine, Ali
Nair, Akash
Sundarapandian, Balasubramanian
Afshar, Niloofar
Kirste, Lutz
Fichtner, Simon
Ambacher, Oliver
Beteiligte Personen und Organisationen

DOI
10.1063/5.0190885
URN
urn:nbn:de:bsz:25-freidok-2466004
Rechteinformation
Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
Letzte Aktualisierung
14.08.2025, 10:48 MESZ

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