Hot-carrier photocurrent effects at graphene–metal interfaces
Rights accessOpen Access
European Commisision's projectNANOANTENNAS - Nano-Optical Antennas for Tuneable Single Photon Super-Emitters (EC-FP7-247330)
GRANOP - Graphene Nano-Photonics (EC-FP7-294056)
CARBONLIGHT - Tunable light tightly bound to a single sheet of carbon atoms:graphene as a novel platform for nano-optoelectronics (EC-FP7-307806)
GRAPHENE - Graphene-Based Revolutions in ICT And Beyond (EC-FP7-604391)
Photoexcitation of graphene leads to an interesting sequence of phenomena, some of which can be exploited in optoelectronic devices based on graphene. In particular, the efficient and ultrafast generation of an electron distribution with an elevated electron temperature and the concomitant generation of a photo-thermoelectric voltage at symmetry-breaking interfaces is of interest for photosensing and light harvesting. Here, we experimentally study the generated photocurrent at the graphene–metal interface, focusing on the time-resolved photocurrent, the effects of photon energy, Fermi energy and light polarization. We show that a single framework based on photo-thermoelectric photocurrent generation explains all experimental results.