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This study explores GeSiSn and SiSn growth on Si(100), detailing growth mechanisms and creating phase diagrams. Researchers achieved specular beam oscillations and detected photoluminescence, paving the way for direct bandgap germanium alloys.

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Surface Science

Background:

  • Germanium-Silicon-Tin (GeSiSn) and Silicon-Tin (SiSn) alloys are promising for advanced electronic and optoelectronic devices.
  • Understanding their growth mechanisms on Silicon (Si) substrates is crucial for controlling film properties.

Purpose of the Study:

  • To investigate the growth mechanisms of GeSiSn and SiSn layers on Si(100).
  • To establish kinetic and phase diagrams for these materials.
  • To explore their potential for direct bandgap applications.

Main Methods:

  • Kinetic and phase diagram construction.
  • Specular beam oscillation monitoring during film growth.
  • Transmission Electron Microscopy (TEM) and X-ray Diffractometry (XRD).
  • Photoluminescence (PL) spectroscopy.
  • Reciprocal space mapping (RSM).
  • Band structure calculations.

Main Results:

  • Kinetic diagrams for GeSiSn/SiSn film states and a phase diagram for Sn/Si(100) were established.
  • Specular beam oscillations observed for SiSn films (150-300 °C, up to 35% Sn), indicating crystal perfection.
  • Pseudomorphic GeSiSn/SiSn films with smooth heterointerfaces confirmed by TEM and XRD.
  • Photoluminescence detected (0.6-0.8 eV) in GeSiSn/Si heterostructures, suggesting type II band alignment.
  • Tensile strained Ge films (0.86%-1.5% strain) created on GeSn layers.
  • Calculations identified Sn content ranges for direct bandgap GeSiSn, SiSn, and GeSn materials.

Conclusions:

  • Precise control over GeSiSn and SiSn growth on Si(100) is achievable.
  • These materials exhibit excellent crystalline quality and interface properties.
  • The findings support the development of direct bandgap germanium alloys for optoelectronic applications.