Understanding negative capacitance dynamics in ferroelectric capacitors

Publication Type:

Conference Paper

Authors:

A.I. Khan; K. Chatterjee; Ramamoorthy Ramesh; S. Salahuddin

Source:

2015 4th Berkeley Symposium on Energy Efficient Electronic Systems, E3S 2015 - Proceedings, Institute of Electrical and Electronics Engineers Inc. (2015)

ISBN:

9781467385688

Keywords:

Capacitance, Capacitors, energy efficiency, External resistors, Ferroelectric capacitors, Ferroelectric devices, Ferroelectric switching, ferroelectricity, iron, negative capacitance, Resistors, Semiconductor device measurements, Semiconductor devices, Single-crystalline, Subthreshold characteristics, Switches, Transient analysis, Transistor structure

Abstract:

We investigate negative capacitance transients-the time period during ferroelectric switching when the voltage across a ferroelectric changes in a direction opposite to that of the charge-by constructing a simple series network of an isolated single crystalline ferroelectric capacitor and an external resistor. A study of negative capacitance dynamics in such a circuit reveals that the time scale of this phenomenon is controlled by the external resistor rather than by the material dependent intrinsic speeds. As a canonical approach for directly measuring ferroelectric negative capacitance, these experiments could guide the efforts to stabilize negative capacitance in a transistor structure for sub-60 mV/decade subthreshold characteristics as well as help assess negative capacitance response speed at technologically relevant dimensions. © 2015 IEEE.

Notes:

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