Hot Carrier Transport and Photocurrent Response in Graphene
Author(s)Song, Justin Chien Wen; Rudner, Mark S.; Marcus, Charles M.; Levitov, Leonid
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
American Chemical Society
Song, Justin C. W. et al. “Hot Carrier Transport and Photocurrent Response in Graphene.” Nano Letters 11.11 (2011): 4688–4692. Web.
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