Thickness-dependent tunable characteristics of (Ba 0.5Sr 0.5) 0.925K 0.075TiO 3 thin films prepared by pulsed laser deposition

Koppole C. Sekhar, Sung Hun Key, Kyung Pyo Hong, Chan Su Han, Jong Min Yook, Dong Soo Kim, Jun Chul Kim, Jong Chul Park, Yong Soo Cho

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Abstract

The thickness-dependent dielectric properties and tunability of pulsed laser deposited (Ba 0.5Sr 0.5) 0.925K 0.075TiO 3 (BSKT) thin films with different thickness ranging from 80 to 300 nm has been investigated. Dielectric properties of the BSKT thin films are substantially improved as the BSKT film thickness increases, which can be explained by the model of a low-permittivity dead layer that is connected in series with the bulk region of the film. The estimated values of thickness and the average dielectric constant for the dead layer are 2.4 nm and 23.5, respectively, in a Pt/BSKT/Pt capacitor structure. The tunability and figure of merit increased with increasing film thickness, which are attributed to the change in lattice parameter and the dead layer effect.

Original languageEnglish
Pages (from-to)654-658
Number of pages5
JournalCurrent Applied Physics
Volume12
Issue number3
DOIs
Publication statusPublished - 2012 May

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

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