Influence of the Template Layer on the Structure and Ferroelectric Properties of PbZr<sub>0.52</sub>Ti<sub>0.48</sub>O<sub>3</sub> Films

Philip Lucke*, Mohammadreza Nematollahi, Muharrem Bayraktar, Andrey E. Yakshin, Johan E. ten Elshof, Fred Bijkerk

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The microstructure of the PbZr0.52Ti0.48O3 (PZT) films is known to influence the ferroelectric properties, but so far mainly the effect of the deposition conditions of the PZT has been investigated. To our knowledge, the influence of the underlying electrode layer and the mechanisms leading to changes in the PZT microstructure have not been explored. Using LaNiO3 (LNO) as the bottom electrode material, we investigated the evolution of the PZT microstructure and ferroelectric
properties for changing LNO pulsed-laser deposition conditions. The explored deposition conditions were the O2 pressure, total pressure, and thickness of the electrode layer. Increasing both the O2 pressure and the thickness of the electrode layer changes the growth of PZT from a smooth, dense film to a rough, columnar film. We explain the origin of the change in
PZT microstructure as the increased roughness of the electrode layer in relaxing the misfit strain. The strain relaxation mechanism is evidenced by the increase in the crystal phase with bulk LNO unit cell dimensions in comparison to the crystal phase with substrate-clamped unit cell dimensions. We explain the change from a dense to a columnar microstructure as a result of the change in the growth mode from Frank−van der Merwe to Stranski−Krastanov. The ferroelectric properties of the columnar films are improved compared to those of the smooth, dense films. The ability to tune the ferroelectric properties with the microstructure is primarily relevant for ferroelectric applications such as actuators and systems for
energy harvesting and storage.
Original languageEnglish
Pages (from-to)22210-22220
Number of pages11
JournalACS Omega
Volume7
Issue number26
Early online date17 Jun 2022
DOIs
Publication statusPublished - 5 Jul 2022

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