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Time-Resolved In Situ Spectroscopy During Formation of the GaP/Si(100) Heterointerface.

Oliver Supplie1,2,3, Matthias M May1,2,3, Gabi Steinbach4

  • 1†Technische Universität Ilmenau, Institut für Physik, 98693 Ilmenau, Germany.

The Journal of Physical Chemistry Letters
|August 12, 2015
PubMed
Summary
This summary is machine-generated.

Investigating gallium phosphide (GaP) nucleation on silicon (Si) using in situ spectroscopy reveals the atomic structure of III-V/Si(100) heterointerfaces. This study identifies Si-P bonds forming at the buried interface during GaP growth.

Keywords:
HeterointerfacesIII−V on SiliconMOCVDoptical in situ spectroscopyphotoelectron spectroscopy

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Area of Science:

  • Materials Science
  • Surface Science
  • Semiconductor Physics

Background:

  • III-V/Si(100) heterointerfaces are critical for advanced epitaxial devices.
  • The precise atomic structure of these interfaces has remained an unresolved issue.
  • Understanding interface formation is key to controlling device properties.

Purpose of the Study:

  • To elucidate the atomic structure of GaP/Si(100) heterointerfaces during growth.
  • To differentiate between surface and interface formation using complementary in situ techniques.
  • To identify the chemical bonds present at the buried interface.

Main Methods:

  • Transient optical in situ spectroscopy during chemical vapor deposition.
  • X-ray photoelectron spectroscopy for chemical analysis.
  • Benchmarking spectroscopic signals against chemical analysis data.

Main Results:

  • A terrace-related optical anisotropy signal indicates GaP nucleation on Si(100).
  • This dielectric anisotropy matches calculations for buried GaP/Si(100) interfaces.
  • X-ray photoelectron spectroscopy confirms the formation of Si-P bonds, corresponding to one monolayer, simultaneously with the optical signal.

Conclusions:

  • Si-P bonds are definitively identified at the buried GaP/Si(100) heterointerface.
  • The study establishes a method to distinguish surface and interface formation during epitaxial growth.
  • The findings provide atomic-level insight into III-V on silicon interface development.