TY - JOUR
T1 - Highly accelerated lifetime testing of potassium sodium niobate thin films
AU - Zhu, Wanlin
AU - Akkopru-Akgun, Betul
AU - Trolier-McKinstry, Susan
N1 - Funding Information:
The authors are thankful to Kenji Shibata for supplying samples and helpful discussions. Support from the National Science Foundation (CPS-1646399, IIP-1361571) and the Center for Dielectrics and Piezoelectrics are gratefully acknowledged.
Publisher Copyright:
© 2017 Author(s).
PY - 2017/11/20
Y1 - 2017/11/20
N2 - Highly accelerated lifetime tests of 2 and 3 μm thick potassium sodium niobate [(K0.5, Na0.5)NbO3, KNN] films with different thicknesses were measured under electric fields ranging from 160 to 350 kV/cm and temperatures ranging from 90 to 210 °C. The medium time to failure (t50) was determined from a lognormal distribution plot of failure times of up to 22 electrodes per measurement condition. The activation energy (Ea) for failure was 0.74 ± 0.04 eV and 0.92 ± 0.05 eV for the 2 μm and 3 μm KNN films, respectively. The voltage acceleration factor was 3.5 ± 0.34 for the 3 μm film. But the electric field dependence of t50 for the 2 μm film showed two regions with similar N, 6.67 and 6.94 ± 0.23, respectively. Energy-dispersive X-ray spectroscopy was employed to investigate the Na+ and K+ ion distributions in KNN films.
AB - Highly accelerated lifetime tests of 2 and 3 μm thick potassium sodium niobate [(K0.5, Na0.5)NbO3, KNN] films with different thicknesses were measured under electric fields ranging from 160 to 350 kV/cm and temperatures ranging from 90 to 210 °C. The medium time to failure (t50) was determined from a lognormal distribution plot of failure times of up to 22 electrodes per measurement condition. The activation energy (Ea) for failure was 0.74 ± 0.04 eV and 0.92 ± 0.05 eV for the 2 μm and 3 μm KNN films, respectively. The voltage acceleration factor was 3.5 ± 0.34 for the 3 μm film. But the electric field dependence of t50 for the 2 μm film showed two regions with similar N, 6.67 and 6.94 ± 0.23, respectively. Energy-dispersive X-ray spectroscopy was employed to investigate the Na+ and K+ ion distributions in KNN films.
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U2 - 10.1063/1.4995618
DO - 10.1063/1.4995618
M3 - Article
AN - SCOPUS:85035038442
SN - 0003-6951
VL - 111
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 21
M1 - 212903
ER -