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Related Concept Videos

Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
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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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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Updated: Dec 11, 2025

Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
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Interlayer Bound Wannier Excitons in Germanium Sulfide.

Sara Postorino1, Jianbo Sun2, Saskia Fiedler3

  • 1Dipartimento di Fisica, Università degli studi di Roma "Tor Vergata", via della Ricerca Scientifica 1, 00133 Roma, Italy.

Materials (Basel, Switzerland)
|August 19, 2020
PubMed
Summary

This study investigates germanium sulfide (GeS) using cathodoluminescence, revealing a distinct emission peak. The findings attribute this peak to exciton recombination, highlighting GeS

Keywords:
2D materialsanisotropycathodoluminescencedensity functional theorygermanium sulfidehexagonal boron nitridemany body perturbation theory

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Layered germanium sulfide (GeS) exhibits visible light emission and significant anisotropy.
  • Recent interest in GeS stems from its unique optoelectronic properties.

Purpose of the Study:

  • To investigate the origin of the sharp emission peak observed in GeS.
  • To elucidate the role of excitonic recombination and optical anisotropy in GeS.

Main Methods:

  • Cathodoluminescence (CL) spectroscopy was performed on GeS flakes.
  • Ab initio ground- and excited-state simulations were conducted for bulk GeS.

Main Results:

  • A sharp emission peak at ~1.69 eV was observed in GeS flakes, independent of quantum confinement.
  • Simulations identified the peak with radiative recombination of the first free bright bound exciton.
  • The exciton exhibits a large optical anisotropy and a Wannier-Mott interlayer character.

Conclusions:

  • The observed optical emission in GeS is unambiguously explained by exciton recombination.
  • GeS demonstrates significant optical anisotropy due to the nature of its excitonic states.