Modeling of dynamic response of ferroelectric capacitors

• Published in: Integrated ferroelectrics Vol. 39; no. 1-4; pp. 179 - 187
• Main Authors: Tamura, Tetsuro, Arimoto, Yoshihiro, Ishiwara, Hiroshi
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.01.2001
• Subjects: ferroelectric capacitor; simulation; switching
• ISSN: 1058-4587; 1607-8489
• DOI: 10.1080/10584580108011941

A simulation model of ferroelectric capacitors which describes both hysteresis loops under arbitrary voltage profile and time dependence of polarization change is developed based on the parallel-element model. In the model, a ferroelectric capacitor is assumed to consist of parallel capacitor elements with different coercive voltage and switching polarization. A new method of pulse measurement is designed to obtain the switching behavior of individual element. The measurement on a sol-gel SrBi 2 Ta 2 O 9 capacitor revealed that the switching time depended on the difference between the applied voltage and the coercive voltage of the capacitor element. The switching behavior is reproduced by inserting a nonlinear resistor in series with each capacitor in the model. All the parameters used in the model are determined from the measured data and no arbitrary fitting parameters are used.