Multidomain Negative Capacitance Effect in P(VDF-TrFE) Ferroelectric Capacitor and Passive Voltage Amplification

This article demonstrates low supply voltage (VDD) and high-frequency polarization switching in an organic ferroelectric capacitor (OFEC). The Landau- Khalatnikov (LK) equation is used to model the organic ferroelectric (OFE) in the Sentaurus technology computer-aided design (TCAD) environment considering multidomain (MD) dynamics and interaction factor (K
_OFE
), resulting in a strong resemblance with the reported experimental results. The operation of OFEC at gigahertz frequency is examined with the experimentally validated MD-LK model. We study the impact of multiple domains in the OFEC on the transient response considering three separate sizes of the top metal plate (TMP). Our findings show that OFEC with a larger TMP area charges slowly than the other OFEC with smaller and proposed area TMP because of the enormous amount of domains in the larger area TMP. Various effects of VDD, external resistor (R), and LK static parameters on negative capacitance signature (NCS) are investigated. We observe the NCS effect at 1 V because the coercive voltage of the OFEC is around 0.56 V, which is 73.33% lower than the conventional ferroelectric (FE) lead zirconate titanate (PZT), resulting in a minimum energy-delay product (EDP) of 2.7 × 10
^-26
Js. We observe that as the value of K
_OFE
increases, the nature of domain wall switches from hard to soft, that is, coercive voltage reduces, resulting in a smaller hysteresis loop. Finally, a passive voltage amplifier (PVA) is implemented which shows voltage amplification of 1.45 at 500 MHz with low viscosity (ρ
_OFE
= 4.5 Ωcm), which is still a challenge for PZT-based NC field-effect transistor (NCFET) reported in the literature.