Thickness-Dependent Electrocaloric Effect in Pb0.9La0.1Zr0.65Ti0.35O3 Films Grown by Sol–Gel Process

Im Jun Roh, Beomjin Kwon, Seung Hyub Baek, Seong Keun Kim, Jin Sang Kim, Chong Yun Kang

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Unlike bulk materials, many physical properties of thin-film materials depend on film thickness due to extrinsic effects such as residual stress and the dead layer. In this work, the effect of thickness on the electrocaloric properties of Pb0.9La0.1(Zr0.65Ti0.35)O3(10/65/35) (PLZT) films grown by the sol–gel method was studied experimentally. In the sol–gel synthesis, the annealing process results in residual stress and the metal–dielectric contact generates a dead layer. These extrinsic effects influence the dielectric and ferroelectric properties of the thin films, and their roles are film thickness dependent. For PLZT of nanometer thickness (from 420 nm to 1080 nm), the permittivity and polarization, and their temperature dependences, showed strong dependence on film thickness. In particular, in the temperature range from 70°C to 350°C, the electrocaloric temperature change showed threefold improvement (from 0.2°C to 0.6°C) as the thickness was increased from 420 nm to 840 nm. This work will aid development of polycrystalline thin films including PLZT for electrocaloric applications.

Original languageEnglish (US)
Pages (from-to)1057-1064
Number of pages8
JournalJournal of Electronic Materials
Volume45
Issue number2
DOIs
StatePublished - Feb 1 2016
Externally publishedYes

Keywords

  • dead layer
  • Electrocaloric effect
  • PLZT
  • residual stress
  • thickness effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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