Enhanced dielectric properties and grain boundary potentials in sulfur-doped CaCu3Ti4O12 thin films

Ye Seul Jung, Yong Soo Cho

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


CaCu3Ti4O12 (CCTO) has been reported to possess a colossal dielectric constant owing to the intrinsic interfacial polarization via charge accumulations across the grain boundary. Herein, we explore the effects of unusual anion-doping on the dielectric properties of sputter-deposited CCTO thin films using an example of sulfur-doping. A post-annealing process of the films was utilized in a flowing H2S atmosphere for the sulfur-doping. The incorporation of sulfur into the perovskite structure was evidenced with the changes in chemical states, such as the reduced cations of Cu+ and Ti3+, the increased concentration of oxygen vacancies, and the formation of S-O[sbnd] bonds. The sulfurized CCTO thin films demonstrated an enhanced relative permittivity of ∼620 at 100 Hz, which is substantially better than that of the unsulfurized film. Direct measurement of the grain-boundary potential using Kelvin probe force microscopy suggests that the enhanced relative permittivity is associated with an increased Schottky barrier height.

Original languageEnglish
Pages (from-to)2375-2381
Number of pages7
JournalJournal of the European Ceramic Society
Issue number6
Publication statusPublished - 2020 Jun

Bibliographical note

Funding Information:
This work was financially supported by grants from the National Research Foundation of Korea ( NRF-2016M3A7B4910151 ); the Industrial Strategic Technology Development Program of the Ministry of Trade, Industry, & Energy ( # 10079981 ); and the Creative Materials Discovery Program of the Ministry of Science and ICT ( 2018M3D1A1058536 ).

Publisher Copyright:
© 2020 Elsevier Ltd

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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