Mechanical manipulation of the transient negative capacitance effect in resistor-ferroelectric capacitor circuit

Transient negative capacitance (NC), as an available dynamic charge effect achieved in resistor-ferroelectric capacitor (R-FEC) circuits, has triggered a series of theoretical and experimental works focusing on its physical mechanism and device application. Here, we analytically derived the effects of different mechanical conditions on the transient NC behaviors in the R-FEC circuit based on the phenomenological model. It shows that the ferroelectric capacitor can exhibit either NC (i.e., “single NC” and “double NC”) or positive capacitance, depending on the mechanical condition and temperature. Further numerical calculations show that the voltage drop caused by NC can be effectively controlled by temperature, applied stress, or strain. The relationship between NC voltage drop and system configurations including external resistance, dynamical coefficient of polarization, and input voltage are presented, showing diverse strategies to manipulate the NC effect. These results provide theoretical guidelines for rational design and efficient control of NC-related electronic devices.