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Direct Plasmon-Driven Photoelectrocatalysis.

Hossein Robatjazi1, Shah Mohammad Bahauddin1, Chloe Doiron1

  • 1Department of Electrical and Computer Engineering, ‡Department of Materials Science and NanoEngineering, §Department of Chemistry, ∥Laboratory for Nanophotonics, and ⊥Rice Quantum Institute, Rice University , 6100 Main Street, Houston, Texas 77005, United States.

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|August 6, 2015
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Summary
This summary is machine-generated.

Researchers developed a novel plasmonic photoelectrode architecture for enhanced energy conversion. This Schottky-free design enables direct hot electron injection from gold nanoparticles, driving photocatalytic reactions efficiently.

Keywords:
Au/NiOxPlasmonic solar energy conversionhot-electronquantum efficiencyselective transport layersolar water splitting

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Area of Science:

  • Plasmonics and Photocatalysis
  • Hot Carrier Energy Conversion

Background:

  • Hot charge carriers offer potential for improved energy conversion technologies.
  • Conventional methods often rely on Schottky junctions for hot carrier collection.

Purpose of the Study:

  • To present a novel plasmonic photoelectrode architecture for photocatalytic reactions.
  • To investigate hot carrier generation and injection without a Schottky junction.

Main Methods:

  • Designed a plasmonic photoelectrode architecture utilizing optical impedance matching for enhanced light absorption.
  • Employed a selective transport layer for carrier separation.
  • Utilized small plasmonic gold nanoparticles for hot carrier generation and injection into water molecules.
  • Studied quantum efficiency of hot electron injection across varying nanoparticle diameters.

Main Results:

  • Observed large photocurrents from a Schottky-free junction, indicating efficient hot electron injection.
  • Demonstrated direct hot electron injection from plasmonic gold nanoparticles into reactant species.
  • Found no significant difference in hot-electron generation and injection efficiencies across different particle dimensions.

Conclusions:

  • The novel Schottky-free plasmonic photoelectrode architecture efficiently drives photocatalytic reactions via direct hot electron injection.
  • This approach bypasses the need for traditional Schottky junctions, offering a new pathway for hot carrier utilization.
  • Particle dimensions did not significantly impact hot electron generation and injection efficiency in this study.