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Related Experiment Videos

Charging ain't all bad: Complex physics in DyScO3.

Christopher A Mizzi1, Pratik Koirala1, Ahmet Gulec1

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA.

Ultramicroscopy
|December 18, 2018
PubMed
Summary
This summary is machine-generated.

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This study overcomes electron beam charging effects in DyScO3 using advanced spectroscopy. Researchers accurately determined the band gap and identified surface states, enabling new scientific discoveries in materials science.

Area of Science:

  • Materials Science
  • Surface Science
  • Electron Microscopy

Background:

  • Electron beam charging is a common challenge in microscopy, often ignored or avoided.
  • Certain materials, like lanthanide scandates, exhibit significant positive charging due to their electronic structure, hindering analysis.
  • Ignoring charging effects can limit the discovery of novel scientific phenomena.

Purpose of the Study:

  • To understand and overcome electron beam charging effects in Dysprosium Scandate (DyScO3).
  • To accurately determine the electronic properties of DyScO3, including its band gap and surface states.
  • To explore both positive and negative charging behaviors in DyScO3.

Main Methods:

  • Utilized rapidly acquired electron energy loss spectra (EELS) combined with cross-correlation techniques.
Keywords:
ChargingDFTEELSFlexoelectricitySurface statesUPS

Related Experiment Videos

  • Employed density functional theory (DFT) calculations for comparative analysis.
  • Conducted ultraviolet photoelectron spectroscopy (UPS) measurements.

    • Main Results:

    • Successfully extracted a charging-corrected band gap of 5.4 eV for DyScO3.
    • Identified a 3.8 eV in-gap peak attributed to surface states through DFT comparison.
    • Observed negative charging under ultraviolet illumination, linked to upward band bending and surface states.
    • Determined that negative charging is Zener tunneling limited under specific conditions.

    Conclusions:

    • The developed methods effectively overcome charging artifacts in electron microscopy for materials like DyScO3.
    • The study provides crucial insights into the electronic structure and surface properties of DyScO3.
    • Understanding charging mechanisms is vital for advancing materials science research and discovering new phenomena.