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Core/Shell-Like Localized Emission at Atomically Thin Semiconductor-Au Interface.

Kiyoung Jo1,2, Christopher E Stevens3,4, Bongjun Choi1

  • 1Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

Nano Letters
|April 9, 2024
PubMed
Summary
This summary is machine-generated.

Localized emission from WSe2 nanobubbles was observed. Strong piezoelectric potential at the WSe2-Au Schottky interface spatially confines excitons, enabling control over localized emission for nano and quantum photonics.

Keywords:
charge transferlocalized emissionpiezoelectricitysemiconductor−metal interfacetip-enhanced scanning probe technique

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Atomically thin semiconductors are promising for single-photon sources.
  • Localized strain effects on exciton emission are studied, but charge transfer impacts on nanobubble emission are unclear.

Purpose of the Study:

  • To investigate localized emission from monolayer WSe2 nanobubbles.
  • To understand the role of charge transfer and electronic junctions on nanobubble emission.

Main Methods:

  • Near-field studies at room temperature.
  • Concurrent analysis of topography, potential, tip-enhanced photoluminescence, and piezo response force microscopy.
  • Tuning the WSe2-Au junction from Schottky to Ohmic.

Main Results:

  • Observation of core/shell-like localized emission from WSe2 nanobubbles.
  • Attribution of emission to strong piezoelectric potential and induced polarity at the WSe2-Au Schottky interface.
  • Demonstration of spatial confinement of excitons.

Conclusions:

  • Charge transfer significantly impacts nanobubble emission.
  • Piezoelectric potential is key for localized emission in WSe2 nanobubbles.
  • New approach for manipulating charge confinement and engineering localized emission in nanobubbles for nano/quantum photonics.