  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.
