Study of Trapping Phenomena in SrTiO₃ by Thermally Stimulated Techniques

Authors

Buguo Wang, Wright State University - Main CampusFollow
Pooneh Saadatkia
David C. Look, Wright State University - Main CampusFollow

Document Type

Article

Publication Date

1-2018

Abstract

Thermally stimulated current (TSC), thermally stimulated depolarization current (TSDC), and thermally stimulated luminescence (TSL) spectroscopies were combined to study trapping phenomena in undoped bulk SrTiO₃ crystals. Electrical measurements were also performed and showed that the crystals are highly resistive in the dark but exhibited an unusually high photocurrent upon 400-nm illumination. Several traps were revealed in both TSC and TSDC spectra between 83 K and 450 K in such a broad temperature range and their activation energies were extrapolated from the trap positions (peaks). TSL spectra demonstrate similar characteristics comparable to TSC and TSDC spectra, though there are some differences because of different excitation and recombination mechanisms. This work reveals the presence of large number of traps in SrTiO₃ single crystals, which are most likely the source of many of the interesting phenomena in SrTiO₃ such as transient and persistent photoconductivity.

Repository Citation

Wang, B., Saadatkia, P., & Look, D. C. (2018). Study of Trapping Phenomena in SrTiO₃ by Thermally Stimulated Techniques. Journal of Electronic Materials, 47 (1), 606-611.
https://corescholar.libraries.wright.edu/physics/1024

DOI

10.1007/s11664-017-5818-9