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Peer-reviewedCC BYNano letters

Quantum-Dot-Based Scanning Probe d-Band Hole Spectroscopy of Plasmonic Nanoparticles.

  • Florian Küstner1
  • Harald Ditlbacher1
  • Andreas Hohenau1
  • Dmitry N Dirin2,3
  • Maksym Kovalenko2,3
  • Joachim R Krenn1
  1. 1Institute of Physics, University of Graz, 8010Graz, Austria.
  2. 2Institute of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093Zürich, Switzerland.
  3. 3Empa - Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Thin Films and Photovoltaics, 8600Dübendorf, Switzerland.
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Abstract

Despite intense research efforts, quantitative energy-resolved measurements on hot carriers generated due to plasmon decay in metal nanoparticles are rare. This concerns in particular excitations below the Fermi level, i.e., holes. Here, we use a metallized scanning probe tip to measure photocurrents from plasmonic gold nanoparticles through a monolayer of colloidal lead sulfide quantum dots. Separating out current contributions from quantum dot excitons and thermionic emission, we achieve quantitative measurements on the hole excitation quantum efficiency in the gold nanoparticles in the 1.9-2.6 eV energy range. Therefore, we combine systematic experimental bias and wavelength variations and a comparison with the case of aluminum with extensive modeling. The detection scheme can be extended to electron currents and other energy ranges by simply using quantum dots with different energy levels.

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Cite

BibTeXRIS
BibTeX
@article{kustner2026quantumdotbased,
  title = {{Quantum-Dot-Based Scanning Probe d-Band Hole Spectroscopy of Plasmonic Nanoparticles.}},
  author = {Florian Küstner and Harald Ditlbacher and Andreas Hohenau and Dmitry N Dirin and Maksym Kovalenko and Joachim R Krenn},
  journal = {Nano letters},
  year = {2026},
  month = oct,
  doi = {10.1021/acs.nanolett.6c03990},
  url = {https://europepmc.org/article/MED/42917047},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Quantum-Dot-Based Scanning Probe d-Band Hole Spectroscopy of Plasmonic Nanoparticles.
AU  - Florian Küstner
AU  - Harald Ditlbacher
AU  - Andreas Hohenau
AU  - Dmitry N Dirin
AU  - Maksym Kovalenko
AU  - Joachim R Krenn
PY  - 2026
DA  - 2026/10/01
JO  - Nano letters
DO  - 10.1021/acs.nanolett.6c03990
UR  - https://europepmc.org/article/MED/42917047
AB  - Despite intense research efforts, quantitative energy-resolved measurements on hot carriers generated due to plasmon decay in metal nanoparticles are rare. This concerns in particular excitations below the Fermi level, i.e., holes. Here, we use a metallized scanning probe tip to measure photocurrents from plasmonic gold nanoparticles through a monolayer of colloidal lead sulfide quantum dots. Separating out current contributions from quantum dot excitons and thermionic emission, we achieve quantitative measurements on the hole excitation quantum efficiency in the gold nanoparticles in the 1.9-2.6 eV energy range. Therefore, we combine systematic experimental bias and wavelength variations and a comparison with the case of aluminum with extensive modeling. The detection scheme can be extended to electron currents and other energy ranges by simply using quantum dots with different energy levels.
SN  - 1530-6984
SN  - 1530-6992
ER  -