Pulsed laser deposition of ferroelectric multilayer capacitors by YBa2Cu3O7-δ/BaTiO3/YBa2Cu3 O7-δ on Si(100) substrates

J. Luo, Q. Li, D. B. Fenner, S. Liu, W. D. Hamblen, X. D. Wu

Research output: Contribution to journalConference articlepeer-review

Abstract

Ferroelectric multilayer capacitors (YBCO/BTO/YBCO) are fabricated on YSZ buffered Si (100) substrates by using pulsed-laser deposition technique. The deposition process is monitored in situ by using a Fourier Transform Infrared Spectrometer (FTIR), which measures the film's deposition rate and dielectric constant during the growth process. All four oxide layers in such a multilayer capacitor are grown in situ without breaking the vacuum, and without lowering the substrate temperature to below 600 °C. The electrical properties and microstructures of the multilayer capacitor are studied and the optimal deposition condition are identified. Sharp resistive transitions are achieved for both the top and the bottom YBCO layers with on-sets at 90 K, zero resistance at 89 K for the bottom layer and 88 K for the top layer. X-ray diffraction θ-2θ and Φ scans indicate that all four deposited oxide layers have their c-axis perpendicular to the substrate, and have less that 10% in-plane misorientation. The dielectric constant of the BTO layer is over 210. Hysteresis P-E characteristics and current-voltage curves are also measured to determine dielectric properties of the barium titanate films. Preliminary results with LaSrCoO (LSCO) electrode layer are also presented.

Original languageEnglish (US)
Pages (from-to)539-544
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume361
StatePublished - 1995
EventProceedings of the 1994 MRS Fall Meeting - Boston, MA, USA
Duration: Nov 28 1994Dec 2 1994

All Science Journal Classification (ASJC) codes

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

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