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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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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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Related Experiment Video

Updated: Aug 29, 2025

Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Localized interlayer excitons in MoSe2-WSe2 heterostructures without a moiré potential.

Fateme Mahdikhanysarvejahany1, Daniel N Shanks1, Matthew Klein1

  • 1Department of Physics, University of Arizona, Tucson, AZ, 85721, USA.

Nature Communications
|September 13, 2022
PubMed
Summary
This summary is machine-generated.

Spectrally narrow interlayer exciton (IX) photoluminescence (PL) in MoSe2-WSe2 heterobilayers is observed even without moiré potential localization. This suggests the moiré potential is not the sole origin of these narrow IX PL lines.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Optoelectronics

Background:

  • Interlayer excitons (IXs) in transition metal dichalcogenide (TMD) heterobilayers are tunable light emitters.
  • Previous studies attributed narrow photoluminescence (PL) lines to IXs localized by moiré potential.

Purpose of the Study:

  • Investigate the origin of spectrally narrow IX PL lines.
  • Determine if moiré potential is essential for IX localization.

Main Methods:

  • Fabrication of MoSe2-WSe2 heterobilayers with and without hexagonal boron nitride (hBN) spacers.
  • Comparison of doping, electric field, magnetic field, and temperature dependence of IX PL.
  • Analysis of excitonic g-factors.

Main Results:

  • Spectrally narrow IX PL lines persist even when moiré potential is suppressed by an hBN spacer.
  • Doping, electric field, and temperature dependencies are similar with and without hBN.
  • Excitonic g-factors show opposite signs, contradicting moiré potential localization.

Conclusions:

  • The moiré potential is not the exclusive origin of spectrally narrow IX PL in MoSe2-WSe2 heterobilayers.
  • Other localization mechanisms likely contribute to the observed narrow PL lines.