Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202105060
Keywords
antiferroelectric; energy storage; epitaxial films; PbHfO; (3)
Categories
Funding
- Ministry of Science and Technology, Taiwan [MOST 106-2119-M-009-011-MY3, 106-2628-E-009-001-MY2, 106-2218-E-009-021, 106-2923-M-009-003-MY2, 107-2112-M-001-042-MY3, 107-2218-E-007-050, 110-2634-F-009-026]
- Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan
- National Key Research and Development Program of China [2017YFA0303403]
- National Natural Science Foundation of China [61974042]
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In this study, epitaxial antiferroelectric PbHfO3 films with different orientations were fabricated, showing remarkable anisotropies of polarization and energy storage properties. By optimizing film orientation, much-improved energy density and excellent high-temperature efficiency were achieved in the PbHfO3 films. Moreover, the films exhibited excellent property robustness against mechanical bending when fabricated onto flexible mica substrates, providing a generalizable pathway for flexible energy-storage dielectric capacitors.
Dielectric capacitors are widely studied for power supply systems because they can quickly store and release electrical energy. Among various kinds of dielectric materials, antiferroelectrics show promising features of high energy-storage density and efficiency. In this study, epitaxial antiferroelectric PbHfO3 films with different orientations are fabricated, in which remarkable anisotropies of polarization and energy storage properties are discovered. With the optimization of film orientation, much-improved energy density and excellent high-temperature efficiency are achieved in the PbHfO3 films. Moreover, the PbHfO3 films are fabricated onto flexible mica substrates, which exhibit excellent property robustness against mechanical bending. This study provides a fundamental understanding of the anisotropic antiferroelectric behaviors of epitaxial PbHfO3 films and provides a generalizable pathway for flexible energy-storage dielectric capacitors.
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