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

Paper ID Volume ID Publish Year Pages File Format Full-Text
32306 44921 2014 17 PDF Available
Title
Photogeneration of hot plasmonic electrons with metal nanocrystals: Quantum description and potential applications
Abstract

•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.

SummaryThe 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 >600 nm), (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.

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Keywords
Plasmon; Plasmonic electrons; Injection of electrons; Nanostructures; Photoelectric effect; Photodetectors; Photocatalysis
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Photogeneration of hot plasmonic electrons with metal nanocrystals: Quantum description and potential applications
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Publisher
Database: Elsevier - ScienceDirect
Journal: - Volume 9, Issue 1, February 2014, Pages 85–101
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us