Enhanced dielectric and tunable characteristics of K-doped Ba 0.5Sr0.5TiO3 thin films prepared by pulsed laser deposition

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

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A series of potassium-doped barium strontium titanate ((Ba 0.5Sr0.5)1 - xKxTiO3) targets with dopant concentration (x) from 0 to 12.5 mol% were synthesized by solid state reaction and the corresponding thin films were fabricated on (111) Pt/Ti/SiO2/Si substrate by using pulsed laser deposition. The doping of K shows strong influences on structural, dielectric and tunable characteristics. Surface roughness of the films decreases with the doping of K up to 7.5 mol% and then increases with further increase of K, whereas the grain size is found to be minimum at 7.5% K. The maximum values of tunability and figure of merit obtained for the optimum 7.5 mol% K-doped thin films are 77% and 65 at an applied field of 400 kV/cm at 100 kHz, respectively, which corresponds to significant improvements compared to the reported results processed by sol-gel or sputtering. The relaxation of crystalline strain inside the grains, and smoother surface with smaller grains are assumed to be responsible for the improved tunability and lower dielectric loss.

Original languageEnglish
Pages (from-to)267-272
Number of pages6
JournalThin Solid Films
Volume527
DOIs
Publication statusPublished - 2013 Jan 1

Fingerprint

Pulsed laser deposition
pulsed laser deposition
Doping (additives)
Thin films
thin films
dielectric loss
figure of merit
strontium
Barium strontium titanate
barium
potassium
surface roughness
grain size
sputtering
gels
Dielectric losses
solid state
Solid state reactions
Sol-gels
Sputtering

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Sekhar, Koppole C. ; Hong, Kyung Pyo ; Key, Sung Hun ; Han, Chan Su ; Kim, Jun Chul ; Kim, Dong Soo ; Park, Jong Chul ; Cho, Yong Soo. / Enhanced dielectric and tunable characteristics of K-doped Ba 0.5Sr0.5TiO3 thin films prepared by pulsed laser deposition. In: Thin Solid Films. 2013 ; Vol. 527. pp. 267-272.
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Enhanced dielectric and tunable characteristics of K-doped Ba 0.5Sr0.5TiO3 thin films prepared by pulsed laser deposition. / Sekhar, Koppole C.; Hong, Kyung Pyo; Key, Sung Hun; Han, Chan Su; Kim, Jun Chul; Kim, Dong Soo; Park, Jong Chul; Cho, Yong Soo.

In: Thin Solid Films, Vol. 527, 01.01.2013, p. 267-272.

Research output: Contribution to journalArticle

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AU - Sekhar, Koppole C.

AU - Hong, Kyung Pyo

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AU - Han, Chan Su

AU - Kim, Jun Chul

AU - Kim, Dong Soo

AU - Park, Jong Chul

AU - Cho, Yong Soo

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N2 - A series of potassium-doped barium strontium titanate ((Ba 0.5Sr0.5)1 - xKxTiO3) targets with dopant concentration (x) from 0 to 12.5 mol% were synthesized by solid state reaction and the corresponding thin films were fabricated on (111) Pt/Ti/SiO2/Si substrate by using pulsed laser deposition. The doping of K shows strong influences on structural, dielectric and tunable characteristics. Surface roughness of the films decreases with the doping of K up to 7.5 mol% and then increases with further increase of K, whereas the grain size is found to be minimum at 7.5% K. The maximum values of tunability and figure of merit obtained for the optimum 7.5 mol% K-doped thin films are 77% and 65 at an applied field of 400 kV/cm at 100 kHz, respectively, which corresponds to significant improvements compared to the reported results processed by sol-gel or sputtering. The relaxation of crystalline strain inside the grains, and smoother surface with smaller grains are assumed to be responsible for the improved tunability and lower dielectric loss.

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