Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 15, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.202100025
Keywords
epitaxial films; ferroelectrics; hafnia; thin films
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Hafnia thin films have robust ferroelectricity and current research is focused on epitaxial growth to eliminate nonpolar phases and investigate the intrinsic factors to ferroelectricity. The studies mainly cover the epitaxial growth mechanism, phase stability, thickness dependency of ferroelectricity in Hafnia.
Hafnia thin films have been under intensive research during the past few years due to its robust ferroelectricity under very thin limit and good compatibility with silicon. The polar crystal structure critical to ferroelectricity in hafnia thin films is metastable, and is generally obtained in polycrystalline thin films, coexisting with other nonpolar phases. Recently, much attention has been focused on epitaxial ferroelectric hafnia thin films to get rid of the nonpolar phases, to investigate the more intrinsic factors to ferroelectricity, and its potential applications. Herein, recent progress on the growth of epitaxial hafnia thin films is reviewed. The epitaxial growth mechanism is explored, in particular, the interface matching, phase stability under temperature and oxygen pressure, followed by discussions on thickness dependency of ferroelectricity, and wake-up effect in hafnia. Finally, an outlook on ferroelectric hafnia both on fundamental studies and future applications is discussed.
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