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High Dynamic Range Pixel Array Detector for Scanning Transmission Electron Microscopy.

Mark W Tate1, Prafull Purohit1, Darol Chamberlain2

  • 11Laboratory of Atomic and Solid State Physics,Cornell University,Ithaca,NY 14853,USA.

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Summary
This summary is machine-generated.

A new electron microscope pixel array detector (EMPAD) offers high dynamic range and fast imaging for scanning transmission electron microscopy. This universal detector enables simultaneous capture of multiple contrast modes and quantitative scattering analysis.

Keywords:
STEMelectron microscope pixel array detector (EMPAD)high dynamic rangemixed-mode pixel array detector (MM-PAD)pixel array detector (PAD)

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Area of Science:

  • Materials Science
  • Physics
  • Electron Microscopy

Background:

  • Scanning transmission electron microscopy (STEM) requires advanced detectors for high-resolution imaging and analysis.
  • Existing detectors often have limitations in dynamic range, speed, or simultaneous data acquisition capabilities.

Purpose of the Study:

  • To introduce and characterize a novel hybrid pixel array detector (EMPAD) for electron microscopy.
  • To demonstrate the capabilities of EMPAD as a universal detector in STEM applications.

Main Methods:

  • Development of a 128x128 pixel silicon diode array detector (EMPAD) with integrated circuitry.
  • Implementation of a high dynamic range (1,000,000:1) and high framing rate (1.1 kHz) data acquisition system.
  • Testing EMPAD with 80-200 keV electron beams in scanning transmission electron microscopy.

Main Results:

  • EMPAD achieves single electron sensitivity with a 1,000,000:1 dynamic range within a single frame.
  • The 1.1 kHz framing rate effectively minimizes sample drift distortions during scanning.
  • Simultaneous capture of bright field, dark field, and phase contrast information, along with full scattering distribution analysis, is demonstrated.
  • Absolute scale recording of scattering enables direct determination of local sample thickness.

Conclusions:

  • The EMPAD is a versatile detector for STEM, offering significant improvements in dynamic range, speed, and analytical capabilities.
  • Its ability to capture comprehensive diffraction information in a single frame facilitates advanced materials characterization.
  • EMPAD paves the way for more detailed and quantitative analysis in electron microscopy.