Revised analysis of negative capacitance in ferroelectric-insulator capacitors
Analytical and numerical results, physical insight, comparison to experiments
T. Rollo (Università degli Studi di Udine)
Franco Bianchini (Università degli Studi di Udine)
G. Giordano (TU Delft - Team Tamas Keviczky)
R. Specogna (Università degli Studi di Udine)
D. Esseni (Università degli Studi di Udine)
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Abstract
We present a revised analysis of Negative Capacitance (NC) in ferroelectric-insulator capacitors, and particularly of the difference between systems with and without a metal interlayer. We develop a model accounting for the three-dimensional electrostatics and report analytical and numerical results based on Landau-Ginzburg equations. Our results explain the lack of NC operation in capacitors having an interlayer metal, compare well with recent experiments and enlighten the role of traps at the ferroelectric-oxide interface.
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