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Hot-Carrier Generation in Bimetallic Janus Nanoparticles.

Hanwen Jin1,2, Chengcheng Xiao1, Matias Herran3

  • 1Department of Materials, Imperial College London, London SW7 2AZ, U.K.

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|January 29, 2026
PubMed
Summary
This summary is machine-generated.

Hot carriers from metallic nanoparticles are key for new devices. This study shows bimetallic Janus nanoparticles, especially Ag-Au, offer high hot-carrier generation rates for enhanced photocatalysis and photovoltaics.

Keywords:
Janus nanoparticleselectronic structurehot carriersmultiscale modelingplasmonics

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • Localized surface plasmons in metallic nanoparticles generate energetic electrons and holes (hot carriers).
  • These hot carriers are crucial for applications in photocatalysis, photovoltaics, and sensing.
  • Bimetallic Janus nanoparticles offer unique properties for controlling hot carrier generation.

Purpose of the Study:

  • To investigate hot carrier generation in bimetallic Janus nanoparticles (Au, Ag, Cu).
  • To understand the influence of nanoparticle shape, composition, and light polarization on hot carrier generation.
  • To provide insights for designing efficient hot-carrier devices.

Main Methods:

  • Utilized an atomistic modeling approach combining macroscopic Maxwell equation solutions with quantum-mechanical tight-binding models.
  • Analyzed spherical and dumbbell-shaped Janus nanoparticles.
  • Studied the dependence on light polarization and nanoparticle geometry.

Main Results:

  • The Ag-Au system showed the highest hot-carrier generation rate under solar illumination.
  • Dumbbell-shaped nanoparticles exhibited increased hot carrier generation with larger neck sizes due to electric field enhancement.
  • Maximum generation rates were achieved when the electric field was perpendicular to the metal interface.

Conclusions:

  • Bimetallic Janus nanoparticles are promising for efficient hot carrier generation.
  • Nanoparticle shape and light polarization significantly impact performance.
  • This research guides the experimental design of advanced hot-carrier devices.