期刊
NANO TODAY
卷 9, 期 1, 页码 85-101出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2014.02.006
关键词
Plasmon; Plasmonic electrons; Injection of electrons; Nanostructures; Photoelectric effect; Photodetectors; Photocatalysis
资金
- Science Foundation Ireland [SFI 11/W.1/12065, SFI 07/IN.1/I1862]
- Ministry of Education and Science of the Russian Federation [14.B25.31.0002]
- NSF [CBET-0933782]
- Volkswagen Foundation
- TUBA
- ESF EURYI
- [NRF-RF-2009-09]
- [NRF-CRP-6-2010-2]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0933415] Funding Source: National Science Foundation
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 >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. (C) 2014 Elsevier Ltd. All rights reserved.
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