Studies of electrical polarization fatigue in SrBi2Ta2O9 thin films

K. M. Lee, D. Thomas, S. H. Kim, J. P. Maria, A. I. Kingon, H. M. Jang

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

The polarization suppression and electrical properties directly associated with the electrical polarization fatigue in SrBi2Ta2O9 system were systematically investigated using Pt/SBT/Pt capacitors. Three general observations were made after 109 switching cycles: (i) approx. 95% of the remanent polarization was conserved, (ii) both high and zero bias field capacitance decreased, and (iii) leakage current density increased from approximately 10-7 to 10-5 A/cm2 at approx. 30kV/cm2. In addition, the 'knee' field, at which the leakage abruptly increases, assumed smaller values with cumulative switching cycles. Temperature dependent leakage data was collected for both as-deposited and field-cycled samples. Based on these results, we propose the possibilities of enhanced concentration of charge carriers or additional reductions in interfacial conduction barriers. Motion of oxygen vacancies to less-shallow energy levels near electrode/ferroelectric interface may allow this mechanism to occur.

Original languageEnglish (US)
Pages (from-to)241-246
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume541
StatePublished - 1999
EventProceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' - Boston, MA, USA
Duration: Nov 30 1998Dec 3 1998

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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