"Hot" electrons in metallic nanostructures—nonthermal carriers or heating?

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"Hot" electrons in metallic nanostructures—nonthermal carriers or heating?

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- "Hot" electrons in metallic nanostructures—nonthermal carriers or heating?
- Light: Science & Applications Vol. 8, Issue 5, Pages: 828-835(2019)
- Affiliations：
  
  1.Department of Chemistry and the Ilse Katz Center for nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer Sheva, Israel
  2.School of Electrical and Computer Engineering and the Ilse Katz Center for nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer Sheva, Israel
- Author bio：
  
  Yonatan Dubi (jdubi@bgu.ac.il)
  Yonatan Sivan (sivanyon@bgu.ac.il)
- Funds：
- DOI：10.1038/s41377-019-0199-x
  CLC：
- Published：2019，
  
  Published Online：02 October 2019，
  
  Received：24 February 2019，
  
  Revised：18 August 2019，
  
  Accepted：07 September 2019
- Accepted：
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Dubi, Y. & Sivan, Y. "Hot" electrons in metallic nanostructures—nonthermal carriers or heating?. Light: Science & Applications, 8, 828-835 (2019).
DOI：

Dubi, Y. & Sivan, Y. "Hot" electrons in metallic nanostructures—nonthermal carriers or heating?. Light: Science & Applications, 8, 828-835 (2019). DOI： 10.1038/s41377-019-0199-x.

摘要

Abstract

Understanding the interplay between illumination and the electron distribution in metallic nanostructures is a crucial step towards developing applications such as plasmonic photocatalysis for green fuels

nanoscale photodetection and more. Elucidating this interplay is challenging

as it requires taking into account all channels of energy flow in the electronic system. Here

we develop such a theory

which is based on a coupled Boltzmann-heat equations and requires only energy conservation and basic thermodynamics

where the electron distribution

and the electron and phonon (lattice) temperatures are determined uniquely. Applying this theory to realistic illuminated nanoparticle systems

we find that the electron and phonon temperatures are similar

thus justifying the (classical) single-temperature models. We show that while the fraction of high-energy "hot" carriers compared to thermalized carriers grows substantially with illumination intensity

it remains extremely small (on the order of 10

-8

). Importantly

most of the absorbed illumination power goes into heating rather than generating hot carriers

thus rendering plasmonic hot carrier generation extremely inefficient. Our formulation allows for the first time a unique quantitative comparison of theory and measurements of steady-state electron distributions in metallic nanostructures.

关键词

Keywords

references

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