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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
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Variable voltage electron microscopy: Toward atom-by-atom fabrication in 2D materials.

Ondrej Dyck1, Stephen Jesse1, Niklas Delby2

  • 1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA.

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|February 12, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a method for precise atomic-level fabrication using scanning transmission electron microscopy. This technique allows controlled manipulation of materials like graphene by varying electron beam energy for faster, more versatile atomic-scale engineering.

Keywords:
Rapid acclerating voltage changee-beam fabricationgraphene patterning, atomic manipulationscanning transmission electron microscope

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Scanning transmission electron microscopy (STEM) utilizes precisely focused electron beams (e-beams) for atomic-level patterning and fabrication.
  • Beam-induced phenomena in STEM are highly sensitive to e-beam energy, closely linked to the knock-on threshold.
  • Current methods face limitations in rapidly altering e-beam energy for dynamic material processing.

Purpose of the Study:

  • To present a novel method for controlling energy transfer to samples in STEM.
  • To enable rapid, in-situ adjustments of accelerating voltages while maintaining stable microscope lens temperatures.
  • To demonstrate advanced atomic-scale fabrication techniques with variable e-beam energies.

Main Methods:

  • Developed a method to control transferred energy by rapidly changing accelerating voltages while stabilizing electron microscope lens temperature.
  • Applied the method for in-situ nano-milling of graphene films.
  • Utilized variable e-beam energies for controlled insertion and movement of silicon dopants within graphene.

Main Results:

  • Successfully demonstrated in-situ nano-milling of graphene.
  • Achieved rapid switching from high-energy milling to lower-energy imaging.
  • Showcased precise control over silicon dopant placement and migration in graphene using distinct e-beam energies.

Conclusions:

  • The developed method offers enhanced control over beam-induced phenomena in STEM.
  • Variable e-beam energy facilitates dynamic processes like nano-milling and dopant manipulation.
  • This approach significantly broadens the potential for atomic-scale electron beam fabrication and material engineering.