Date of Award
Master of Science in Engineering (MSE)
Electrical and Computer Engineering
Fat D. Ho
David J. Coe
Jennifer M. English
Ferroelectric storage cells., Capacitors., Hysteresis loop., Humidity.
The property of ferroelectricity in these capacitors and the unique behavior due to the materials used are compared with purely dielectric ceramic capacitors in this thesis. Ferroelectric capacitors were analyzed via hysteresis loop measurements. Energy storage, loss, and the efficiency of each capacitor were calculated by analyzing the empirical data with MATLAB. As the effect of humidity, which was completely overlooked in the previous research, was so significant that it needed to be considered, leakage current removal was improved upon and calculated in order to evaluate the effects of leakage current intrinsic to the samples. Finally, an empirical model of the ferroelectric capacitor was developed with detailed methods of calculating the charge hysteresis based on empirical data in high voltage/electric fields, neither of which were performed in previous research with these ferroelectric samples. The model was validated by comparing the measured data to the computed data focusing on the following parameters: energy storage, efficiency, and voltage-dependent charge hysteresis and voltage-dependent capacitance, both of which had not been in earlier research.
Nakajima, Naoki, "Revised empirical analysis and modeling of ferroelectric capacitors for energy storage" (2019). Theses. 293.