Wake-up Free Ferroelectric Rhombohedral Phase in Epitaxially Strained ZrO2 Thin Films
authors Silva, JPB; Negrea, RF; Istrate, MC; Dutta, S; Aramberri, H; Iniguez, J; Figueiras, FG; Ghica, C; Sekhar, KC; Kholkin, AL
nationality International
journal ACS APPLIED MATERIALS & INTERFACES
author keywords rhombohedral ZrO2 films; ferroelectricity; wake-up free films; epitaxially strained films; ion-beam sputtering deposition technique
keywords ENERGY-STORAGE; POLARIZATION; ANTIFERROELECTRICITY; HYSTERESIS; MEMORY
abstract Zirconia- and hafnia-based thin films have attracted tremendous attention in the past decade because of their unexpected ferroelectric behavior at the nanoscale, which enables the downscaling of ferroelectric devices. The present work reports an unprecedented ferroelectric rhombohedral phase of ZrO2 that can be achieved in thin films grown directly on (111)-Nb:SrTiO3 substrates by ion-beam sputtering. Structural and ferroelectric characterizations reveal (111)-oriented ZrO2 films under epitaxial compressive strain exhibiting switchable ferroelectric polarization of about 20.2 mu C/cm(2) with a coercive field of 1.5 MV/cm. Moreover, the time-dependent polarization reversal characteristics of Nb:SrTiO3/ZrO2/Au film capacitors exhibit typical bell-shaped curve features associated with the ferroelectric domain reversal and agree well with the nucleation limited switching (NLS) model. The polarization-electric field hysteresis loops point to an activation field comparable to the coercive field. Interestingly, the studied films show ferroelectric behavior per se, without the need to apply the wake-up cycle found in the orthorhombic phase of ZrO2. Overall, the rhombohedral ferroelectric ZrO2 films present technological advantages over the previously studied zirconia- and hafnia-based thin films and may be attractive for nanoscale ferroelectric devices.
publisher AMER CHEMICAL SOC
issn 1944-8244
isbn 1944-8252
year published 2021
volume 13
issue 43
beginning page 51383
ending page 51392
digital object identifier (doi) 10.1021/acsami.1c15875
web of science category 10
subject category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
unique article identifier WOS:000715852100071
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journal impact factor 8.758
5 year journal impact factor 8.901
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