title: All-graphene photodetectors.
abstract: We investigate the optoelectronic properties of novel graphene/FeCl3-intercalated few-layer graphene (FeCl3-FLG, dubbed graphexeter) heterostructures using photovoltage spectroscopy. We observe a prominent photovoltage signal generated at the graphene/FeCl3-FLG and graphene/Au interfaces, whereas the photovoltage at the FeCl3-FLG/Au interface is negligible. The sign of the photovoltage changes upon sweeping the chemical potential of the pristine graphene through the charge neutrality point, and we show that this is due to the photothermoelectric effect. Our results are a first step toward all-graphene-based photodetectors and photovoltaics.
authors.affiliation: Centre for Graphene Science, College of Engineering, Mathematics, and Physical Sciences, University of Exeter, Exeter EX4 4QL, United Kingdom.
authors.forename: Freddie
authors.initials: F
authors.lastname: Withers
authors.forename: Thomas Hardisty
authors.initials: TH
authors.lastname: Bointon
authors.forename: Monica Felicia
authors.initials: MF
authors.lastname: Craciun
authors.forename: Saverio
authors.initials: S
authors.lastname: Russo