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Electron beam-induced current imaging with two-angstrom resolution.

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Summary
This summary is machine-generated.

Electron beam-induced current (EBIC) imaging is now possible at lattice resolution by detecting secondary electron emission (SEEBIC). This breakthrough overcomes previous limitations in high-resolution EBIC detection, enabling advanced nanoscale imaging.

Keywords:
Aberration-correctionEBICSTEMSecondary electronsTransmission electron microscopy

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Area of Science:

  • Materials Science
  • Electron Microscopy
  • Nanotechnology

Background:

  • Scanning electron microscopes (SEMs) generate secondary electrons (SEs) and electron beam-induced currents (EBICs).
  • Standard SEM detectors (Everhart-Thornley) excel at SE detection, but EBIC detection faces performance challenges.
  • High-resolution EBIC imaging is difficult due to limitations in current detection amplifiers.

Purpose of the Study:

  • To achieve lattice-resolution imaging using electron beam-induced current (EBIC).
  • To develop a novel method for high-performance EBIC detection.
  • To demonstrate the capability of the new technique on microfabricated devices and calibration grids.

Main Methods:

  • Utilized an aberration-corrected scanning transmission electron microscope (STEM).
  • Developed a method to detect EBIC signals generated by secondary electron emission (SEEBIC).
  • Performed imaging on microfabricated devices and standard calibration grids.

Main Results:

  • Achieved lattice-resolution imaging through SEEBIC detection.
  • Demonstrated the effectiveness of the SEEBIC technique.
  • Successfully imaged nanoscale structures with high fidelity.

Conclusions:

  • SEEBIC detection enables high-resolution EBIC imaging, overcoming previous limitations.
  • This technique expands the capabilities of electron microscopy for nanoscale analysis.
  • The method is applicable to various samples, including microelectronic devices.