Photothermoelectric and Photoelectric Contributions to Light Detection in Metal–Graphene–Metal Photodetectors

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 wavel...

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Bibliographic Details
Published in:Nano letters 2014-07, Vol.14 (7), p.3733-3742
Main Authors: Echtermeyer, T. J, Nene, P. S, Trushin, M, Gorbachev, R. V, Eiden, A. L, Milana, S, Sun, Z, Schliemann, J, Lidorikis, E, Novoselov, K. S, Ferrari, A. C
Format: Article
Language:English
Subjects:
Applied sciences
Constants
Cross-disciplinary physics: materials science
rheology
Electronics
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Graphene
High speed
Light absorption
Materials science
Optoelectronic devices
Optoelectronics
Photodetectors
Photoelectricity
Physics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Specific materials
Wavelengths
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Summary: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.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl5004762