Hot Carrier Transport and Photocurrent Response in Graphene
Name
levitov4.pdf
Size
216.58 KB
Format
Adobe PDF
Checksum (MD5)
8b3165a2ff9fd369eb74b4bb0c02e883
Author(s)
Song, Justin Chien Wen
Rudner, Mark S.
Marcus, Charles M.
Levitov, Leonid
Date Issued
September 2011
Journal
Nano Letters
Publisher
American Chemical Society
Citation
Song, Justin C. W. et al. “Hot Carrier Transport and Photocurrent Response in Graphene.” Nano Letters 11.11 (2011): 4688–4692. Web.
Version
Author's final manuscript
Abstract
Strong electron–electron interactions in graphene are expected to result in multiple-excitation generation by the absorption of a single photon. We show that the impact of carrier multiplication on photocurrent response is enhanced by very inefficient electron cooling, resulting in an abundance of hot carriers. The hot-carrier-mediated energy transport dominates the photoresponse and manifests itself in quantum efficiencies that can exceed unity, as well as in a characteristic dependence of the photocurrent on gate voltages. The pattern of multiple photocurrent sign changes as a function of gate voltage provides a fingerprint of hot-carrier-dominated transport and carrier multiplication.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1021/nl202318u
