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Graphene's high mobility and Fermi velocity, combined with its constant lightabsorption in the visible to far-infrared range, make it an ideal material tofabricate high-speed and ultra-broadband photodetectors. However, the precisemechanism of photodetection is still debated. Here, we report wavelength andpolarization dependent measurements of metal-graphene-metal photodetectors.This allows us to quantify and control the relative contributions of bothphoto-thermo- and photoelectric effects, both contributing to the overallphotoresponse. This paves the way for a more efficient photodetector design forultra-fast operating speeds.

Photo-thermoelectric and photoelectric contributions to light detection in metal-graphene-metal photodetectors