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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Image-histogram-based secondary electron counting to evaluate detective quantum efficiency in SEM.

Akshay Agarwal1, John Simonaitis1, Karl K Berggren1

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Summary

This study introduces a new method for measuring the Detective Quantum Efficiency (DQE) in scanning electron microscopy by directly counting secondary electrons, improving accuracy for nanoscale imaging. This technique avoids assumptions about electron distribution, enabling precise DQE measurements across various conditions.

Keywords:
Detective quantum efficiencyElectron countingImage histogramsScanning electron microscopy

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Area of Science:

  • Materials Science
  • Microscopy
  • Physics

Background:

  • Scanning electron microscopy (SEM) is crucial for nanoscale imaging of diverse materials.
  • Detective Quantum Efficiency (DQE) quantifies SEM performance by measuring detected secondary electrons (SEs).
  • Existing DQE measurement methods often assume a Poisson distribution for SEs, potentially causing inaccuracies.

Purpose of the Study:

  • To develop and demonstrate a novel technique for accurate DQE measurement in SEM.
  • To overcome limitations of Poisson distribution assumptions in DQE calculations.
  • To enable precise DQE characterization under a broader range of imaging parameters.

Main Methods:

  • Directly counting the mean number of detected secondary electrons (SEs) using image histograms.
  • Implementing a method that does not assume Poisson distribution for SE emission.
  • Mapping DQE variations as a function of working distance in SEM.

Main Results:

  • A new, more accurate method for DQE measurement in SEM was successfully introduced.
  • The technique provides accurate DQE values without relying on Poisson distribution assumptions.
  • Variations in DQE were successfully mapped concerning the microscope's working distance.

Conclusions:

  • The developed technique offers a more accurate approach to DQE measurement in scanning electron microscopy.
  • This method enhances the reliability of SEM performance characterization, especially under non-ideal conditions.
  • Accurate DQE mapping provides valuable insights for optimizing SEM imaging parameters.