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Efficient Size-Dependent Hot Electron Transfer from Au to TiO2 Nanoparticles.

Nandan Ghorai1, Zhicheng Yang1, Sara T Gebre1

  • 1Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, United States.

Nano Letters
|February 14, 2025
PubMed
Summary

Harvesting plasmon-induced hot carriers in metal/semiconductor systems can boost solar energy conversion. Reducing gold nanoparticle size significantly enhances hot electron transfer efficiency for improved solar cell performance.

Keywords:
Au nanoparticlesTiO2hot electron transferplasmon dampingsurface plasmon resonance

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photovoltaics

Background:

  • Plasmon-induced hot carriers at metal/semiconductor interfaces are key for solar energy conversion.
  • Current efficiencies are limited, hindering practical applications.

Purpose of the Study:

  • To demonstrate highly efficient plasmonic hot electron transfer.
  • To investigate the impact of nanoparticle size and excitation wavelength on efficiency.

Main Methods:

  • Fabrication of gold nanoparticles (Au NPs) of varying sizes (5.25 nm and 9.1 nm) on TiO2 films.
  • Ultrafast laser excitation at different wavelengths (400, 500, 600 nm).
  • Measurement of hot electron transfer quantum efficiency (QE).

Main Results:

  • Achieved a maximum QE of 57 ± 4% with 5.25 nm Au NPs at 400 nm excitation.
  • QE decreased to 20% for 9.1 nm Au NPs.
  • QE showed minimal change with excitation wavelength.
  • Identified contributions from interband absorption, PHET, and PICTT pathways, all increasing with smaller Au size.

Conclusions:

  • Reducing plasmonic nanoparticle size is a critical strategy for enhancing hot-carrier extraction.
  • Optimizing nanoparticle size can significantly improve solar energy conversion efficiencies.