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Related Concept Videos

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Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
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Cryogenic electron beam induced chemical etching.

Aiden A Martin1, Milos Toth

  • 1School of Physics and Advanced Materials, University of Technology, Sydney , 15 Broadway, Ultimo, New South Wales 2007, Australia.

ACS Applied Materials & Interfaces
|October 22, 2014
PubMed
Summary

Cryogenic cooling enables efficient electron beam induced etching (EBIE) using nitrogen trifluoride. This technique allows for high-resolution etching of silicon and other materials at low temperatures.

Keywords:
electron beam induced etchingnanofabricationnitrogen trifluoridereaction kineticssiliconsurface chemistry

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Electron Beam Induced Etching (EBIE) is a powerful nanofabrication technique.
  • Etch rates for many precursors are limited at room and elevated temperatures.
  • Novel methods are needed to expand EBIE's applicability and material compatibility.

Purpose of the Study:

  • To investigate the use of cryogenic cooling to enhance EBIE efficiency.
  • To demonstrate EBIE with nitrogen trifluoride (NF3) at low temperatures.
  • To explore high-resolution etching of various materials using cryogenic EBIE.

Main Methods:

  • Utilized cryogenic cooling to achieve sub-ambient substrate temperatures.
  • Employed nitrogen trifluoride (NF3) as the gas-mediated precursor for EBIE.
  • Electron beam was used to induce etching of Si, SiO2, SiC, and Si3N4.

Main Results:

  • Achieved efficient gas-mediated EBIE at cryogenic temperatures, where etch rates are negligible otherwise.
  • Demonstrated successful volatilization and etching of Si, SiO2, SiC, and Si3N4 using NF3.
  • Showcased high-resolution, deterministic etching of silicon via NF3 and XeF2 EBIE at cryogenic conditions.

Conclusions:

  • Cryogenic cooling significantly enhances EBIE efficiency and broadens precursor selection.
  • This method enables precise, high-resolution etching of diverse materials previously limited by temperature.
  • Cryogenic EBIE presents a versatile approach for advanced nanofabrication.