Robust Switchable Polarization and Coupled Electronic Characteristics of Magnesium-Doped Zinc Oxide.

Autor: Zhang H; School of Materials Science and Engineering, The University of New South Wales (UNSW) Sydney, Sydney, New South Wales 2052, Australia., Alanthattil A; Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India., Webster RF; School of Materials Science and Engineering, The University of New South Wales (UNSW) Sydney, Sydney, New South Wales 2052, Australia.; Electron Microscope Unit, UNSW Sydney, Sydney, New South Wales 2052, Australia., Zhang D; School of Materials Science and Engineering, The University of New South Wales (UNSW) Sydney, Sydney, New South Wales 2052, Australia.; ARC Centre of Excellence in Future Low-Energy Electronics Technologies, UNSW Sydney, Sydney, New South Wales 2052, Australia., Ghasemian MB; School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, New South Wales 2006, Australia.; School of Chemical Engineering, UNSW Sydney, Sydney, New South Wales 2052, Australia., Venkataramana RB; Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India., Seidel J; School of Materials Science and Engineering, The University of New South Wales (UNSW) Sydney, Sydney, New South Wales 2052, Australia.; ARC Centre of Excellence in Future Low-Energy Electronics Technologies, UNSW Sydney, Sydney, New South Wales 2052, Australia., Sharma P; ARC Centre of Excellence in Future Low-Energy Electronics Technologies, UNSW Sydney, Sydney, New South Wales 2052, Australia.; College of Science and Engineering, Flinders University, Bedford Park, South Australia 5042, Australia.; Flinders Institute for Nanoscale Science and Technology, Flinders University, Adelaide, South Australia 5042, Australia.
Jazyk: angličtina
Zdroj: ACS nano [ACS Nano] 2023 Sep 12; Vol. 17 (17), pp. 17148-17157. Date of Electronic Publication: 2023 Sep 01.
DOI: 10.1021/acsnano.3c04937
Abstrakt: Ferroelectrics possess a spontaneous polarization that is switchable by an electric field and is critical for the development of low-energy nanoelectronics and neuromorphic applications. However, apart from a few recent developments, the realization of switchable polarization in metal oxides with simpler structures has been a major challenge. Here, we demonstrate the presence of robust switchable polarization at the level of a single nanocrystallite in magnesium-doped zinc oxide thin films with polar wurtzite crystal structures. Using a combination of high-resolution scanning probe microscopy and spectroscopic techniques, voltage control of the polarization and the coupled electronic transport behavior revealing a giant resistance change of approximately 10000% is unveiled. Time- and frequency-resolved nanoscale measurements provide key insights into the polarization phenomenon and a 9-fold increase in the effective longitudinal piezoelectric coefficient. Our work thus constitutes a crucial step toward validating nanoscale ferroelectricity in polar wurtzites for use in advanced nanoelectronics and memory applications.
Databáze: MEDLINE