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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Correlation of Bandgap Reduction with Inversion Response in (Si)GeSn/High-k/Metal Stacks.

C Schulte-Braucks1, K Narimani1, S Glass1

  • 1Peter Grünberg Institute 9 (PGI 9) and JARA-FIT, Forschungszentrum Juelich GmbH , 52425 Juelich, Germany.

ACS Applied Materials & Interfaces
|February 22, 2017
PubMed
Summary
This summary is machine-generated.

The bandgap of Germanium-Tin (GeSn) alloys shrinks with increasing Tin content, enhancing minority carrier response. This suggests GeSn is promising for optoelectronics without compromising carrier lifetime.

Keywords:
GeSndefectsdirect band gapgeneration/recombinationhigh-k/metal gate

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Group IV Alloys

Background:

  • The bandgap tunability of Silicon-Germanium-Tin (SiGeSn) group IV semiconductors is crucial for advanced Si-technology.
  • SiGeSn alloys offer tunable bandgaps (0.4-0.8 eV) for photonic and low-power electronic applications.

Purpose of the Study:

  • To investigate the capacitance-voltage characteristics of high-k/metal gate stacks on GeSn and SiGeSn alloys.
  • To understand the impact of Tin (Sn) content on minority carrier inversion response.

Main Methods:

  • Systematic study of capacitance-voltage (C-V) characteristics.
  • Temperature and frequency-dependent C-V measurements.
  • Comparison with k.p theory and photoluminescence data.

Main Results:

  • A direct correlation was found between Sn-induced bandgap shrinkage and enhanced minority carrier response.
  • The enhanced minority generation rate is linked to bandgap reduction, not substrate/interface effects.
  • A dominant defect level for minority carrier inversion was identified at ~0.4 eV above the valence band edge.

Conclusions:

  • Tin (Sn) in GeSn alloys does not inherently impair minority carrier lifetime.
  • Improved SiGeSn material quality is expected to enhance nonradiative recombination times.
  • This is critical for efficient light detectors and room-temperature lasing in SiGeSn devices.