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Title: Effects of Interlayer Coupling on Hot-Carrier Dynamics in Graphene-Derived van der Waals Heterostructures

Abstract

Graphene exhibits promise as a plasmonic material with high mode confinement that could enable efficient hot carrier extraction. The lifetimes and mean free paths of energetic carriers have been investigated in free‐standing graphene, graphite, and a heterostructure consisting of alternating graphene and hexagonal boron nitride layers using ab initio calculations of electron–electron and electron–phonon scattering in these materials. It is found that the extremely high lifetimes (3 ps) of low‐energy carriers near the Dirac point in graphene, which are a 100 times larger than that in noble metals, are reduced by an order of magnitude due to interlayer coupling in graphite, but enhanced in the heterostructure due to phonon mode clamping. However, these lifetimes drop precipitously with increasing carrier energy and are smaller than those in noble metals at energies exceeding 0.5 eV. By analyzing the contribution of different scattering mechanisms and interlayer interactions, desirable spacer layer characteristics—high dielectric constant and heavy atoms—that could pave the way for plasmonic heterostructures with improved hot carrier transport have been identified.

Authors:
 [1];  [2];  [3];  [4]
  1. Faculty of Arts and Sciences, Harvard University, Cambridge MA 02138 USA
  2. Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy NY 12180 USA
  3. Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy NY 12180 USA
  4. Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy NY 12180 USA; Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy NY 12180 USA
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1543462
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Advanced Optical Materials
Additional Journal Information:
Journal Volume: 5; Journal Issue: 15; Journal ID: ISSN 2195-1071
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
Materials Science; Optics

Citation Formats

Narang, Prineha, Zhao, Litao, Claybrook, Steven, and Sundararaman, Ravishankar. Effects of Interlayer Coupling on Hot-Carrier Dynamics in Graphene-Derived van der Waals Heterostructures. United States: N. p., 2017. Web. doi:10.1002/adom.201600914.
Narang, Prineha, Zhao, Litao, Claybrook, Steven, & Sundararaman, Ravishankar. Effects of Interlayer Coupling on Hot-Carrier Dynamics in Graphene-Derived van der Waals Heterostructures. United States. doi:10.1002/adom.201600914.
Narang, Prineha, Zhao, Litao, Claybrook, Steven, and Sundararaman, Ravishankar. Fri . "Effects of Interlayer Coupling on Hot-Carrier Dynamics in Graphene-Derived van der Waals Heterostructures". United States. doi:10.1002/adom.201600914.
@article{osti_1543462,
title = {Effects of Interlayer Coupling on Hot-Carrier Dynamics in Graphene-Derived van der Waals Heterostructures},
author = {Narang, Prineha and Zhao, Litao and Claybrook, Steven and Sundararaman, Ravishankar},
abstractNote = {Graphene exhibits promise as a plasmonic material with high mode confinement that could enable efficient hot carrier extraction. The lifetimes and mean free paths of energetic carriers have been investigated in free‐standing graphene, graphite, and a heterostructure consisting of alternating graphene and hexagonal boron nitride layers using ab initio calculations of electron–electron and electron–phonon scattering in these materials. It is found that the extremely high lifetimes (3 ps) of low‐energy carriers near the Dirac point in graphene, which are a 100 times larger than that in noble metals, are reduced by an order of magnitude due to interlayer coupling in graphite, but enhanced in the heterostructure due to phonon mode clamping. However, these lifetimes drop precipitously with increasing carrier energy and are smaller than those in noble metals at energies exceeding 0.5 eV. By analyzing the contribution of different scattering mechanisms and interlayer interactions, desirable spacer layer characteristics—high dielectric constant and heavy atoms—that could pave the way for plasmonic heterostructures with improved hot carrier transport have been identified.},
doi = {10.1002/adom.201600914},
journal = {Advanced Optical Materials},
issn = {2195-1071},
number = 15,
volume = 5,
place = {United States},
year = {2017},
month = {3}
}

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