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Photogeneration of hot plasmonic electrons with metal nanocrystals: Quantum description and potential applications

Govorov, Alexander O. ; Zhang, Hui ; Demir, Hilmi Volkan ; Gun’ko, Yurii K.

Nano today, 2014-02, Vol.9 (1), p.85-101 [Periódico revisado por pares]

Kidlington: Elsevier Ltd

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  • Título:
    Photogeneration of hot plasmonic electrons with metal nanocrystals: Quantum description and potential applications
  • Autor: Govorov, Alexander O. ; Zhang, Hui ; Demir, Hilmi Volkan ; Gun’ko, Yurii K.
  • Assuntos: Injection of electrons ; Nanostructures ; Photocatalysis ; Photodetectors ; Photoelectric effect ; Plasmon ; Plasmonic electrons
  • É parte de: Nano today, 2014-02, Vol.9 (1), p.85-101
  • Descrição: •The paper presents a quantum theory of photogeneration of plasmonic carriers.•Energetic plasmonic carriers are efficiently generated only in small nanocrystals.•The carrier generation and absorption spectra are significantly different.•Inter-band transitions create a large number of hot plasmonic holes.•Related applications are in optoelectronics, photocatalysis, and solar-energy harvesting. The paper reviews physical concepts related to the collective dynamics of plasmon excitations in metal nanocrystals with a focus on the photogeneration of energetic carriers. Using quantum linear response theory, we analyze the wave function of a plasmon in nanostructures of different sizes. Energetic carriers are efficiently generated in small nanocrystals due to the non-conservation of momentum of electrons in a confined nanoscale system. On the other hand, large nanocrystals and nanostructures, when driven by light, produce a relatively small number of carriers with large excitation energies. Another important factor is the polarization of the exciting light. Most efficient generation and injection of high-energy carriers can be realized when the optically induced electric current is along the smallest dimension of a nanostructure and also normal to its walls and, for efficient injection, the current should be normal to the collecting barrier. Other important properties and limitations: (1) intra-band transitions are preferable for generation of energetic electrons and dominate the absorption for relatively long wavelengths (approximately >600nm), (2) inter-band transitions efficiently generate energetic holes and (3) the carrier-generation and absorption spectra can be significantly different. The described physical properties of metal nanocrystals are essential for a variety of potential applications utilizing hot plasmonic electrons including optoelectronic signal processing, photodetection, photocatalysis and solar-energy harvesting.
  • Editor: Kidlington: Elsevier Ltd
  • Idioma: Inglês;Russo
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