Photothermoelectric and photoelectric contributions to light detection in metal-graphene-metal photodetectors.
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Peer-reviewed
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Abstract
Graphene's high mobility and Fermi velocity, combined with its constant light absorption in the visible to far-infrared range, make it an ideal material to fabricate high-speed and ultrabroadband photodetectors. However, the precise mechanism of photodetection is still debated. Here, we report wavelength and polarization-dependent measurements of metal-graphene-metal photodetectors. This allows us to quantify and control the relative contributions of both photothermo- and photoelectric effects, both adding to the overall photoresponse. This paves the way for a more efficient photodetector design for ultrafast operating speeds.
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Keywords
Graphene, photodetectors, Raman spectroscopy, photoresponse, optoelectronics
Journal Title
Nano Lett
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Journal ISSN
1530-6984
1530-6992
1530-6992
Volume Title
14
Publisher
American Chemical Society (ACS)
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Sponsorship
Engineering and Physical Sciences Research Council (EP/K01711X/1)
Engineering and Physical Sciences Research Council (EP/K017144/1)
European Commission (604391)
Engineering and Physical Sciences Research Council (EP/L016087/1)
Engineering and Physical Sciences Research Council (EP/K017144/1)
European Commission (604391)
Engineering and Physical Sciences Research Council (EP/L016087/1)