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Related Experiment Videos

InP(001)-(2 x 1) surface: a hydrogen stabilized structure.

W G Schmidt1, P H Hahn, F Bechstedt

  • 1Institut für Festkörpertheorie und Theoretische Optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany. W.G.Schmidt@ifto.physic.uni-jena.de

Physical Review Letters
|April 12, 2003
PubMed
Summary

The InP(001)(2 x 1) surface is not clean but hydrogen-induced, resolving a long-standing surface science puzzle. This finding explains the surface structure under epitaxy conditions and confirms the electron counting rule.

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Area of Science:

  • Surface science
  • Materials science
  • Solid-state physics

Background:

  • The InP(001)(2 x 1) surface was previously thought to be a clean semiconductor surface with buckled phosphorus dimers.
  • This structure appeared to violate the electron counting principle, attributed to strong electron correlation effects.

Purpose of the Study:

  • To resolve the microscopic structure of the InP(001)(2 x 1) surface.
  • To explain the apparent violation of the electron counting principle.

Main Methods:

  • First-principles calculations
  • Reflectance anisotropy spectroscopy (RAS)
  • Low-energy electron diffraction (LEED) experiments

Main Results:

  • The (2 x 1) reconstruction is not a clean surface but is induced by adsorbed hydrogen.

Related Experiment Videos

  • Hydrogen atoms are adsorbed in an alternating sequence on buckled phosphorus dimers.
  • The resolved structure obeys the electron counting rule.

    • Conclusions:

    • The InP(001)(2 x 1) surface structure relevant to gas phase epitaxy is hydrogen-terminated.
    • The electron counting rule is satisfied, resolving previous discrepancies.
    • This work clarifies the fundamental surface chemistry of Indium Phosphide.