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- W4293498884 abstract "Abstract With the superior analog/RF performance of planar device architectures such as fully depleted silicon-on-insulator (FDSOI) MOSFETs, it becomes important to investigate the impact of a ferroelectric material in the gate stack, resulting in negative capacitance (NC) behavior, on the device performance. In this work, through calibrating the FDSOI MOSFET (as the baseline device architecture) with experimental data, we compare the impact of ferroelectric–dielectric (FE–DE) and ferroelectric–paraelectric–dielectric (FE–PE–DE) gate stacks on the electrostatics of an NCFET device for a practically realisable metal–ferroelectric–insulator–semiconductor (MFIS) structure. A suitable thickness of the ferroelectric (FE) layer in the FE–DE stack and the maximum drain–source voltage ( <?CDATA $V_mathrm{ds}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>V</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>d</mml:mi> <mml:mi mathvariant=normal>s</mml:mi> </mml:mrow> </mml:msub> </mml:math> ) that can be applied (determining the power supply voltage), are identified so as to ensure that constraints such as no negative differential resistance (NDR) effects, threshold voltage ( <?CDATA $V_mathrm{th}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>V</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>t</mml:mi> <mml:mi mathvariant=normal>h</mml:mi> </mml:mrow> </mml:msub> </mml:math> ), sub-threshold slope (SS) invariability with drain voltage variations and hysteresis-free behavior in transfer characteristics ( <?CDATA $I_mathrm d$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>I</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>d</mml:mi> </mml:mrow> </mml:msub> </mml:math> – <?CDATA $V_mathrm{gs}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>V</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>g</mml:mi> <mml:mi mathvariant=normal>s</mml:mi> </mml:mrow> </mml:msub> </mml:math> ) are all satisfied. From the thickness of the FE layer in the FE–DE stack, the thickness of the FE layer in the FE–PE–DE stack (PE layer thickness is fixed at 1 nm) is determined where with a thicker FE layer, we obtain similar capacitance from the FE–PE–DE gate stack to that obtained from the FE–DE stack, while meeting all the constraints applied to the FE–DE stack based NCFET, enabling determination of the power supply voltage. Through showing good SSs with reduced output conductance ( <?CDATA $g_mathrm{ds}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>g</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>d</mml:mi> <mml:mi mathvariant=normal>s</mml:mi> </mml:mrow> </mml:msub> </mml:math> ), resulting in improved dc gain ( <?CDATA $frac{g_mathrm{m}}{g_mathrm{ds}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mfrac> <mml:msub> <mml:mi>g</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>m</mml:mi> </mml:mrow> </mml:msub> <mml:msub> <mml:mi>g</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>d</mml:mi> <mml:mi mathvariant=normal>s</mml:mi> </mml:mrow> </mml:msub> </mml:mfrac> </mml:math> ) and improved linearity parameters ( <?CDATA $g_mathrm{m2}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>g</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>m</mml:mi> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> </mml:math> and <?CDATA $g_mathrm{m3}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mi>g</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>m</mml:mi> <mml:mn>3</mml:mn> </mml:mrow> </mml:msub> </mml:math> ) along with scaling of power supply, an FE–PE–DE stack shows better analog performance, with lower power consumption, compared to an FE–DE stack, for an FDSOI NCFET, at 14 nm gate length." @default.
- W4293498884 created "2022-08-29" @default.
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- W4293498884 date "2022-08-30" @default.
- W4293498884 modified "2023-09-25" @default.
- W4293498884 title "Improved analog performance of FDSOI based NCFET with a ferroelectric–paraelectric–dielectric gate stack" @default.
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