Hot Carrier Transport and Photocurrent Response in Graphene

Details Hot Carrier Transport and Photocurrent Response in Graphene Hot Carrier Transport and Photocurrent Response in Graphene

2011-05-05

arxiv.org/abs/1105.1142v2

Nano Lett., 11 (11), pp 4688-4692 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pgs, 2 fgs

Scientific paper

10.1021/nl202318u

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.

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