期刊
NANO LETTERS
卷 11, 期 11, 页码 4688-4692出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl202318u
关键词
Graphene; photocurrent; hot carrier; carrier multiplication; photothermoelectric
类别
资金
- NSS program, Singapore
- Naval Research Grant [N00014-09-1-0724]
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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