Title :
Can piezoelectricity lead to negative capacitance?
Author :
Wong, Justin C. ; Salahuddin, Sayeef
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of California, Berkeley, Berkeley, CA, USA
Abstract :
A thermodynamic model was constructed to quantitatively analyze the negative capacitance effect in the presence of piezoelectricity, electrostriction, and ferroelectricity. The model shows that pure piezoelectricity and higher-order electromechanical coupling can provide a negative capacitance effect in principle, but are not strong enough in practice. Negative capacitance is predicted to occur due to ferroelectric polarization switching and not due to piezoelectricity.
Keywords :
electrostriction; ferroelectric switching; piezoelectricity; thermodynamics; electrostriction; ferroelectric polarization switching; higher-order electromechanical coupling; negative capacitance effect; piezoelectricity; thermodynamic model; Capacitance; Electric fields; Electrostriction; Materials; Piezoelectricity; Strain; Thermodynamics;
Conference_Titel :
Electron Devices Meeting (IEDM), 2014 IEEE International
DOI :
10.1109/IEDM.2014.7047046
