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Updated: Jun 8, 2025

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High-κ monocrystalline dielectrics for low-power two-dimensional electronics.

Lei Yin1, Ruiqing Cheng1, Xuhao Wan2

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Summary

Researchers developed ultrathin, monocrystalline gadolinium pentoxide as a novel insulator for advanced electronics. This material enables high-performance transistors and circuits with low power consumption, overcoming scaling limitations in nanoelectronics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Complementary metal-oxide-semiconductor (CMOS) technology scaling faces performance degradation due to limitations in traditional insulator materials.
  • Developing high-dielectric constant, wide bandgap insulators with high tunnel masses is critical for next-generation nanoelectronics.

Purpose of the Study:

  • To investigate two-dimensional monocrystalline gadolinium pentoxide as a potential high-performance insulator for advanced electronic devices.
  • To demonstrate the integration of ultrathin gadolinium pentoxide insulators in transistors and circuits.

Main Methods:

  • Theoretical calculations combined with particle swarm optimization algorithm to devise the material.
  • Synthesis of two-dimensional monocrystalline gadolinium pentoxide via van der Waals epitaxy.
  • Fabrication and characterization of molybdenum disulfide transistors and inverter circuits using the synthesized insulator.

Main Results:

  • Achieved a high dielectric constant (~25.5) and a wide bandgap simultaneously in monocrystalline gadolinium pentoxide.
  • Demonstrated an equivalent oxide thickness of 1 nm with ultralow leakage current (~10^-4 A cm^-2 at 5 MV cm^-1).
  • Molybdenum disulfide transistors exhibited high on/off ratios (>10^8) and near-Boltzmann-limit subthreshold swing at 0.5 V, with inverter circuits showing high gain and nanowatt power consumption.

Conclusions:

  • Two-dimensional monocrystalline gadolinium pentoxide is a promising material for overcoming scaling limitations in nanoelectronics.
  • The reliable integration of ultrathin monocrystalline insulators paves the way for future high-performance, low-power nanoelectronic devices.