Strain as a Global Factor in Stabilizing the Ferroelectric Properties of ZrO2

Bohan Xu, Patrick D. Lomenzo, Alfred Kersch, Tony Schenk, Claudia Richter, Chris M. Fancher, Sergej Starschich, Fenja Berg, Peter Reinig, Kristina M. Holsgrove, Takanori Kiguchi, Thomas Mikolajick, Ulrich Boettger, Uwe Schroeder

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Since the discovery of ferroelectricity in doped HfO2 and ZrO2 thin films over a decade ago, fluorite-structured ferroelectric thin films have attracted much research attention due to their excellent scalability and complementary metal-oxide semiconductor compatibility compared to conventional perovskite ferroelectric materials. Although various factors influencing the formation of the ferroelectric properties are identified, a clear understanding of the causes of the phase formation have been difficult to determine. In this work, ZrO2 films deposited by atomic layer deposition and chemical solution deposition have resulted in films with completely different structural properties. Regardless of these differences, a general relationship between strain and phase formation is established, leading to a more unified understanding of ferroelectric phase formation in undoped ZrO2 films, which can be applied to other fluorite-structured films.

Original languageEnglish
Article number2311825
JournalAdvanced Functional Materials
Volume34
Issue number8
DOIs
StatePublished - Feb 19 2024

Funding

B.X. and P.D.L. were financially supported by the Deutsche Forschungs Gemeinschaft (DFG) within the following projects (Zeppelin (433647091) and Homer (430054035)). The work of P.R. was partly funded by the Federal Ministry of Education and Research (BMBF) under the project reference numbers 16FMD01K, 16FMD02 and 16FMD03. S.S., F.B., and U.B. were financially supported by the DFG with the project Zeppelin (433647091). T.S. and C.R. were financed by DFG “Inferox” project (MI 1247/11-2). T.M. and U.S. were financially supported out of the Saxonian State budget approved by the delegates of the Saxon State Parliament. This work was co-financed from the tax revenues on the basis of the budget adopted by the Saxon State Parliament. Open access funding enabled and organized by Projekt DEAL. B.X. and P.D.L. were financially supported by the Deutsche Forschungs Gemeinschaft (DFG) within the following projects (Zeppelin (433647091) and Homer (430054035)). The work of P.R. was partly funded by the Federal Ministry of Education and Research (BMBF) under the project reference numbers 16FMD01K, 16FMD02 and 16FMD03. S.S., F.B., and U.B. were financially supported by the DFG with the project Zeppelin (433647091). T.S. and C.R. were financed by DFG “Inferox” project (MI 1247/11‐2). T.M. and U.S. were financially supported out of the Saxonian State budget approved by the delegates of the Saxon State Parliament. This work was co‐financed from the tax revenues on the basis of the budget adopted by the Saxon State Parliament.

Keywords

  • ferroelectricity
  • strain
  • stress
  • thin film
  • zirconia

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