Intrinsic response time of graphene photodetectors

Details Intrinsic response time of graphene photodetectors Intrinsic response time of graphene photodetectors

2011-05-16

arxiv.org/abs/1105.3123v2

Nano Lett., 2011, 11 (7), pp 2804-2808

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1021/nl2011388

Graphene-based photodetectors are promising new devices for high-speed optoelectronic applications. However, despite recent efforts, it is not clear what determines the ultimate speed limit of these devices. Here, we present measurements of the intrinsic response time of metal-graphene-metal photodetectors with monolayer graphene using an optical correlation technique with ultrashort laser pulses. We obtain a response time of 2.1 ps that is mainly given by the short lifetime of the photogenerated carriers. This time translates into a bandwidth of ~262 GHz. Moreover, we investigate the dependence of the response time on gate voltage and illumination laser power.

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