journal article·2021-02-01Open access

The other model antiferroelectric: PbHfO3 thin films from ALD precursors

Brendan Hanrahan, Cosme Milesi-Brault, Asher Leff, Alexis Payne, Shi Liu, Mael Guennou, Nicholas Strnad

APL Materials· Volume 9· Issue 2

Abstract

Antiferroelectric PbHfO3 is grown from atomic layer deposition precursors lead bis(dimethylaminomethylpropanolate) and tetrakis dimethylamino hafnium with H2O and O3 oxidizers in thicknesses from 20 nm to 200 nm at a substrate temperature of 250 °C. X-ray analysis shows an as-grown crystalline PbO phase that diffuses into an amorphous HfO2 matrix upon annealing to form a randomly oriented, orthorhombic PbHfO3 thin film. Electrical characterization reveals characteristic double hysteresis loops with maximum polarizations of around 30 µC/cm2 and transition fields of 350 kV/cm–500 kV/cm depending on the thickness. Temperature-dependent permittivity and polarization testing show a phase transition at 185 °C, most probably to the paraelectric phase, but give no clear evidence for the intermediate phase known from bulk PbHfO3. The energy storage density for the films reaches 16 J/cm3 at 2 MV/cm. A dielectric tunability of 221% is available within 1 V for the thinnest film. These results highlight the unique spectrum of properties available for thin film perovskite antiferroelectrics.
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Research context

OpenAlex topics: Ferroelectric and Piezoelectric Materials · Ferroelectric and Negative Capacitance Devices · Semiconductor materials and devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Sensors and Electron Devices Directorate, U.S. Army Research Laboratory 1 , Adelphi, Maryland 20783, USA

Materials Research and Technology Department, Luxembourg Institute of Science and Technology 2 , 41 rue du Brill, L-4422 Belvaux, Luxembourg

Inter-Institutional Research Group Uni.lu-LIST on Ferroic Materials 3 , 41 rue du Brill, L-4422 Belvaux, Luxembourg

General Technical Services, LLC 4 , Wall, New Jersey 07727, USA

Materials Science and Engineering Department, North Carolina State University 5 , Raleigh, North Carolina 27606, USA

School of Science, Westlake University 6 , Hangzhou, Zhejiang 310024, China

Institute of Natural Sciences, Westlake Institute for Advanced Study 7 , Hangzhou, Zhejiang 310024, China

Department of Physics and Materials Science, University of Luxembourg 8 , 41 rue du Brill, L-4422 Belvaux, Luxembourg

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