The negative differential capacitance (NDC) of ferroelectrics could be used to reduce the energy consumption of ultra-scaled logic devices. An NDC phenomenon in ultrathin ferroelectric zirconium-doped hafnia is demonstrated. Field-effect transistors incorporating this ferroelectric in the gate stack display enhanced on-currents and reduced off-currents compared with conventional analogues, as well as tunable and enduring NDC.
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Salahuddin, S. & Datta, S. Use of negative capacitance to provide voltage amplification for low power nanoscale devices. Nano Lett. 8, 405–410 (2008). This paper proposed the use of NDC to realize low-power devices.
Alam, M. A., Si, M. & Ye, P. D. A critical review of recent progress of negative capacitance field-effect transistors. Appl. Phys. Lett. 114, 090401 (2019). A review article that presents the progress of NDC FETs.
Hoffmann, M. et al. Unveiling the double-well energy landscape in a ferroelectric layer. Nature 565, 464–467 (2019). This paper reports the measurement of an S-shaped P–E relationship in HZO (11.6 nm thick) within metal/dielectric/HZO/metal structures.
Zubko, P. et al. Negative capacitance in multidomain ferroelectric superlattices. Nature 534, 524–528 (2016). This paper reports the NDC effect in multidomain epitaxial Pb0.5Sr0.5TiO3–SrTiO3 superlattices, determined by X-ray diffraction analysis and supporting simulations.
Yadav, A. K. et al. Spatially resolved steady-state negative capacitance. Nature 565, 468–471 (2019). This paper reports the NDC effect in multidomain epitaxial SrTiO3–PbTiO3 superlattices by scanning transmission electron microscopy analysis and supporting simulations.
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This is a summary of: Jo, S. et al. Negative differential capacitance in ultrathin ferroelectric hafnia. Nat. Electron. https://doi.org/10.1038/s41928-023-00959-3 (2023).
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Validating negative differential capacitance for advanced low-power devices. Nat Electron 6, 335–336 (2023). https://doi.org/10.1038/s41928-023-00961-9