Generation of hot electrons in nanostructures incorporating conventional and unconventional plasmonic materials

2019 ◽  
Vol 214 ◽  
pp. 199-213 ◽  
Author(s):  
Tianji Liu ◽  
Lucas V. Besteiro ◽  
Zhiming Wang ◽  
Alexander O. Govorov
Keyword(s):  
Hot Electrons ◽  
Hot Electron ◽  
Peak Efficiency ◽  
Plasmonic Materials ◽  
Electron Generation

The choice of materials for hot electron generation and injection: peak efficiency or broadband.

scholarly journals Direct optical excitation of dark plasmons for hot electron generation

2019 ◽  
Vol 214 ◽  
pp. 159-173 ◽  
Author(s):  
Niclas S. Mueller ◽  
Bruno G. M. Vieira ◽  
Dominik Höing ◽  
Florian Schulz ◽  
Eduardo B. Barros ◽  
...  
Keyword(s):  
Polarized Light ◽  
Optical Excitation ◽  
Cost Effective ◽  
Hot Electrons ◽  
Hot Electron ◽  
Electron Generation ◽  
Linearly Polarized

We demonstrate the excitation of dark modes and creation of hot electrons using linearly polarized light and scalable, cost-effective plasmonic surfaces.

scholarly journals Plasmonic hot-electron photodetection with quasi-bound states in the continuum and guided resonances

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wenhao Wang ◽  
Lucas V. Besteiro ◽  
Peng Yu ◽  
Feng Lin ◽  
Alexander O. Govorov ◽  
...  
Keyword(s):  
Bound States ◽  
Structural Parameters ◽  
Hybrid Structure ◽  
Fine Tuning ◽  
Hot Electrons ◽  
Hot Electron ◽  
Perfect Absorption ◽  
High Loss ◽  
Guided Mode ◽  
The Continuum

Abstract Hot electrons generated in metallic nanostructures have shown promising perspectives for photodetection. This has prompted efforts to enhance the absorption of photons by metals. However, most strategies require fine-tuning of the geometric parameters to achieve perfect absorption, accompanied by the demanding fabrications. Here, we theoretically propose a Ag grating/TiO2 cladding hybrid structure for hot electron photodetection (HEPD) by combining quasi-bound states in the continuum (BIC) and plasmonic hot electrons. Enabled by quasi-BIC, perfect absorption can be readily achieved and it is robust against the change of several structural parameters due to the topological nature of BIC. Also, we show that the guided mode can be folded into the light cone by introducing a disturbance to become a guided resonance, which then gives rise to a narrow-band HEPD that is difficult to be achieved in the high loss gold plasmonics. Combining the quasi-BIC and the guided resonance, we also realize a multiband HEPD with near-perfect absorption. Our work suggests new routes to enhance the light-harvesting in plasmonic nanosystems.

scholarly journals Direct observation and manipulation of hot electrons at room temperature

2020 ◽  
Author(s):  
Hailu Wang ◽  
Fang Wang ◽  
Hui Xia ◽  
Peng Wang ◽  
Tianxin Li ◽  
...  
Keyword(s):  
Direct Observation ◽  
Real Space ◽  
Hot Electrons ◽  
Hot Electron ◽  
Performance Limit ◽  
Solar Cell Efficiency ◽  
Semiconductor Nanowire ◽  
Cell Efficiency ◽  
Intervalley Scattering ◽  
Occupied State

Abstract In modern electronics and optoelectronics, hot electron behaviors are highly concerned since they determine the performance limit of a device or system, like the associated thermal or power constraint of chips, the Shockley-Queisser limit for solar cell efficiency. Up-to-date, however, the manipulation of hot electrons is mostly based on conceptual interpretations rather than a direct observation. The problem arises from a fundamental fact that energy-differential electrons are mixed up in real-space, making it hard to distinguish them from each other by standard measurements. Here we demonstrate a distinct approach to artificially (spatially) separate hot electrons from cold ones in semiconductor nanowire transistors, which thus offers a unique opportunity to observe and modulate electron occupied state, energy, mobility, and even its path. Such a process is accomplished through the scanning-photocurrent-microscopy (SPCM) measurements by activating the intervalley-scattering events and one-dimensional charge-neutrality rule. Findings discovered here may provide a new degree of freedom in manipulating nonequilibrium electrons for both electronic and optoelectronic applications.

scholarly journals Spatial Separation of Plasmonic Hot Electron Generation and a Hydrodehalogenation Reaction Center Using a DNA Wire

2021 ◽  
Author(s):  
Sergio Kogikoski Junior ◽  
Anushree Dutta ◽  
Ilko Bald
Keyword(s):  
Spatial Separation ◽  
Decomposition Reaction ◽  
Charge Carriers ◽  
Hot Electrons ◽  
Hot Electron ◽  
Plasmonic Nanoparticle ◽  
Double Stranded Dna ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

<p>Using hot charge carriers far from a plasmonic nanoparticle surface is very attractive for many applications in catalysis and nanomedicine, and will lead to a better understanding of plasmon-induced processes, such as hot charge carrier or heat driven chemical reactions. Herein we show that DNA is able to transfer hot electrons generated by a silver nanoparticle over several nanometers to drive a chemical reaction in a molecule non-adsorbed on the surface. For this we use 8-bromo-adenosine introduced in different positions within a double stranded DNA oligonucleotide. The DNA is also used to assemble the nanoparticles into superlattices enabling the use of surface enhanced Raman scattering to track the decomposition reaction. To prove the DNA mediated transfer, the probe molecule was insulated from the charge carriers source, which hindered the reaction. The results indicate that DNA can provide an attractive platform to study the transfer of hot electrons, leading to the future development of more advanced plasmonic catalysts. </p>

Boosting Hot-Electron Generation: Exciton Dissociation at the Order–Disorder Interfaces in Polymeric Photocatalysts

2017 ◽  
Vol 139 (6) ◽  
pp. 2468-2473 ◽  
Author(s):  
Hui Wang ◽  
Xianshun Sun ◽  
Dandan Li ◽  
Xiaodong Zhang ◽  
Shichuan Chen ◽  
...  
Keyword(s):  
Hot Electron ◽  
Exciton Dissociation ◽  
Electron Generation

scholarly journals Ultrafast Plasmon-Enhanced Hot Electron Generation at Ag Nanocluster/Graphite Heterojunctions

2017 ◽  
Vol 139 (17) ◽  
pp. 6160-6168 ◽  
Author(s):  
Shijing Tan ◽  
Liming Liu ◽  
Yanan Dai ◽  
Jindong Ren ◽  
Jin Zhao ◽  
...  
Keyword(s):  
Hot Electron ◽  
Electron Generation

Hot Electron Generation and Transport in Intense Field Physics

2008 ◽  
Vol 35 (2) ◽  
pp. 216-220
Author(s):  
王光昶 Wang Guangchang ◽  
陈涛 Chen Tao ◽  
张婷 Zhang Ting ◽  
邓利 Deng Li ◽  
郑志坚 Zheng Zhijian
Keyword(s):  
Hot Electron ◽  
Electron Generation ◽  
Intense Field

New materials for hot electron generation: general discussion

2019 ◽  
Vol 214 ◽  
pp. 365-386 ◽  
Author(s):  
Javier Aizpurua ◽  
Jeremy Baumberg ◽  
Alexandra Boltasseva ◽  
Phillip Christopher ◽  
Emiliano Cortes ◽  
...  
Keyword(s):  
Hot Electron ◽  
New Materials ◽  
Electron Generation

scholarly journals Observation of a phonon bottleneck in copper-doped colloidal quantum dots

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Lifeng Wang ◽  
Zongwei Chen ◽  
Guijie Liang ◽  
Yulu Li ◽  
Runchen Lai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cadmium Selenide ◽  
Phonon Scattering ◽  
Photochemical Reactions ◽  
Hot Electrons ◽  
Colloidal Quantum Dots ◽  
Hot Electron ◽  
Electron Cooling ◽  
Phonon Bottleneck ◽  
Cooling Mechanism

Abstract Hot electrons can dramatically improve the efficiency of solar cells and sensitize energetically-demanding photochemical reactions. Efficient hot electron devices have been hindered by sub-picosecond intraband cooling of hot electrons in typical semiconductors via electron-phonon scattering. Semiconductor quantum dots were predicted to exhibit a “phonon bottleneck” for hot electron relaxation as their quantum-confined electrons would couple very inefficiently to phonons. However, typical cadmium selenide dots still exhibit sub-picosecond hot electron cooling, bypassing the phonon bottleneck possibly via an Auger-like process whereby the excessive energy of the hot electron is transferred to the hole. Here we demonstrate this cooling mechanism can be suppressed in copper-doped cadmium selenide colloidal quantum dots due to femtosecond hole capturing by copper-dopants. As a result, we observe a lifetime of ~8.6 picosecond for 1Pe hot electrons which is more than 30-fold longer than that in same-sized, undoped dots (~0.25 picosecond).

Z-dependence of hot electron generation in femtosecond laser interaction with solid targets

2004 ◽  
Vol 37 (3) ◽  
pp. 539-546 ◽  
Author(s):  
Z L Chen ◽  
J Zhang ◽  
T J Liang ◽  
H Teng ◽  
Q L Dong ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Hot Electron ◽  
Laser Interaction ◽  
Electron Generation
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