Journal
NANO LETTERS
Volume 11, Issue 7, Pages 2804-2808Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl2011388
Keywords
Graphene; photodetectors; nonlinear photoresponse; carrier dynamics
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Funding
- Austrian Science Fund FWF (SFB-IRON, DK-CoQuS)
- Austrian Nano Initiative project (PLATON)
- Austrian Society for Microelectronics (GMe)
- Austrian Science Fund (FWF) [W1210] Funding Source: Austrian Science Fund (FWF)
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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 similar to 262 GHz. Moreover, we investigate the dependence of the response time on gate voltage and illumination laser power.
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