Direct, spatially resolved observation of defect states with electromigration and degradation of single crystal SrTiO3
Abstract
Laterally and depth-resolved cathodoluminescence spectroscopy (DRCLS) provided direct, nanoscale measurements of oxygen vacancy and oxygen vacancy complex distributions in undoped and Fe-doped SrTiO3 with high temperature electric field stress associated with dielectric resistance degradation. DRCLS provided direct and spatially resolved observation of oxygen vacancy migration driven by external electric fields from the anode to the cathode in undoped SrTiO3 between laterally separated electrodes, resulting in increased current leakage and lower thermal breakdown strength. DRCLS measurements through planar Pt electrodes after high temperature electric field cycling reveal pronounced oxygen vacancy depletion within the surface space region of the Pt/SrTiO3 Schottky barrier as predicted theoretically. These results provide a direct insight into the transient states impacting the conduction during the electromigration of the oxygen vacancies. The deconvolution of different peaks and their intensity variations relative to the direct bandgap provide methods to gauge the relative defect energetics of these gap states. These data are discussed in relation to providing a tool to further understand conduction in mixed ionic conductors.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 05, 2020
- Source ID
- 10.1063/1.5130892
Entities
People
- Clive A. Randall
- Hantian Gao
- Leonard J Brillson
- Sulata Sahu
Organizations
- Air Force Office of Scientific Research
- Ohio State University
- Pennsylvania State University