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Germanium terminated (1 0 0) diamond.

Michael J Sear1, Alex K Schenk1, Anton Tadich1,2

  • 1Department of Chemistry and Physics, La Trobe Institute for Molecular Sciences, La Trobe University, Victoria 3086, Australia.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|January 10, 2017
PubMed
Summary

Researchers created a germanium-terminated diamond surface with a specific reconstruction. This ordered surface achieved a negative electron affinity, crucial for advanced electronic applications.

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Area of Science:

  • Surface Science
  • Materials Science
  • Solid State Physics

Background:

  • Diamond surfaces are critical for electronic devices.
  • Achieving ordered, functionalized diamond surfaces remains a challenge.

Purpose of the Study:

  • To form and characterize an ordered germanium-terminated (100) diamond surface.
  • To investigate surface reconstruction and electronic properties.

Main Methods:

  • Low Energy Electron Diffraction (LEED) for surface structure analysis.
  • Synchrotron-based Core Level Photoemission Spectroscopy (CLPS) for elemental and chemical state identification.
  • Exploration of various surface preparation techniques.

Main Results:

  • Successfully formed an ordered germanium-terminated (100) diamond surface.
  • Identified a two-domain c(2x2) surface reconstruction common across preparation methods.
  • Determined surface saturation with 1.26 Ge atoms per unit cell.
  • Measured a negative electron affinity of -0.71 eV.

Conclusions:

  • The (100) diamond surface can be controllably terminated with germanium.
  • The resulting surface exhibits a stable reconstruction and a desirable negative electron affinity.
  • This ordered surface is a promising candidate for vacuum electronics and other applications.