Voltage offsets and imprint mechanism in SrBi{sub 2}Ta{sub 2}O{sub 9} thin films
- Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)
It is shown that voltage shifts in the hysteresis response of SrBi{sub 2}Ta{sub 2}O{sub 9} (SBT) thin-film capacitors can be induced using both thermal and optical methods. These voltage shifts are important since they can lead to imprint failure in ferroelectric memory devices. It is suggested that the voltage shifts in the hysteresis curve of SBT are caused by trapping of electronic charge carriers near the film/electrode interfaces, as has been previously reported for the Pb(Zr,Ti)O{sub 3} (PZT) system. In addition, a direct correlation is established between the magnitude and sign of remanent polarization ({ital P}{sub {ital r}}) and the thermally induced voltage shifts ({ital V}{sub {ital i}}), where {ital V}{sub {ital i}}={alpha}{ital P}{sub {ital r}}+{beta}. It is also found that, unlike the PZT system, the thermally induced voltage shifts in SBT are smaller than those optically induced. One possible implication of this result is that the contribution of defect{endash}dipole complexes to the voltage shifts in SBT is negligible. We suggest that the smaller contribution of defect-dipole complexes to the voltage shifts in SBT may be related to a smaller oxygen vacancy concentration in the perovskite sublattice of SBT as compared to that of PZT. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Sandia National Laboratory
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 383740
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 80; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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