Positive non-linear capacitance: the origin of the steep subthreshold-slope in ferroelectric FETs

We show that the non-linear positive capacitance (PC) of ferroelectrics (FE) can explain the steep subthreshold-slope (SS) observed in FE based MOSFETs and often attributed to the existence of a negative capacitance in FE capacitors. Physically attainable and unattainable regions of the S-shape curv...

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Bibliographic Details
Published in:Scientific reports 2019-10, Vol.9 (1), p.14957-9, Article 14957
Main Authors: Alam, Md Nur K., Roussel, P., Heyns, M., Van Houdt, J.
Format: Article
Language:English
Subjects:
639/166/987
639/766/1130/2798
639/925/927/1007
Capacitance
Electric fields
Equilibrium
Humanities and Social Sciences
Investigations
multidisciplinary
Science
Science (multidisciplinary)
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Summary:We show that the non-linear positive capacitance (PC) of ferroelectrics (FE) can explain the steep subthreshold-slope (SS) observed in FE based MOSFETs and often attributed to the existence of a negative capacitance in FE capacitors. Physically attainable and unattainable regions of the S-shape curve used in the negative capacitance theory are investigated by self-consistently solving Landau-Khalatnikov and Maxwell equations and by experimental validation. Finally, the conditions for attaining a steep SS in FE based MOSFETs assuming only positive capacitances are discussed.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-51237-2