SKM 2023 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 1: Focus: Domains and Domainwalls in (Multi)Ferroics I
KFM 1.5: Invited Talk
Monday, March 27, 2023, 10:45–11:15, POT 51
Domains or no Domains in Wurtzite-Type Ferroelectrics — •Simon Fichtner1,2, Niklas Wolff1, Tom-Niklas Kreutzer2, Georg Schönweger1,2, Adrian Petraru1, Hermann Kohlstedt1, Lorenz Kienle1, and Fabian Lofink1,2 — 1Faculty on Engineering, Christian Albrechts University, Kiel, Germany — 2Fraunhofer ISIT, Itzehoe, Germany
For decades, the wurtzite structure served as a posterchild for pyroelectric, i.e. spontaneously polarized materials which are yet not ferroelectric. The resulting inability to control the dipole ordering after synthetization has largely limited research on wurtzite-type polarization domains and --walls to their suppression. Therefore, the growth of single domain materials of defined polarity has been one of the ultimate goals for the main applications of wurtzite-type semiconductors in the fields of MEMS, RF-, power- and optoelectronics.
Today though, the discovery of ferroelectricity in wurtzite-type solid solutions promises unprecedent possibilities in terms of reconfigurable polarization control in wurtzite-type materials, but also creates the necessity for renewed scientific attention to the domains and -walls of this structure. This contribution aims to provide a vantage point for this attention by giving a glimpse into the literature on this subject and by reporting on our preliminary experimental work on domains in wurtzite-type ferroelectrics. Regarding the latter, transmission electron and piezoelectric force microscopy next to chemical anisotropy studies allow us to draw first conclusions regarding the nucleation, coalescence and distribution of domains in this particular material class.