title: High Responsivity, Large-Area Graphene/MoS2 Flexible Photodetectors.
abstract: We present flexible photodetectors (PDs) for visible wavelengths fabricated by stacking centimeter-scale chemical vapor deposited (CVD) single layer graphene (SLG) and single layer CVD MoS2, both wet transferred onto a flexible polyethylene terephthalate substrate. The operation mechanism relies on injection of photoexcited electrons from MoS2 to the SLG channel. The external responsivity is 45.5A/W and the internal 570A/W at 642 nm. This is at least 2 orders of magnitude higher than bulk-semiconductor flexible membranes. The photoconductive gain is up to 4 × 10(5). The photocurrent is in the 0.1-100 μA range. The devices are semitransparent, with 8% absorptance at 642 nm, and are stable upon bending to a curvature of 1.4 cm. These capabilities and the low-voltage operation (<1 V) make them attractive for wearable applications.
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Domenico
authors.initials: D
authors.lastname: De Fazio
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Ilya
authors.initials: I
authors.lastname: Goykhman
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Duhee
authors.initials: D
authors.lastname: Yoon
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Matteo
authors.initials: M
authors.lastname: Bruna
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Anna
authors.initials: A
authors.lastname: Eiden
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Silvia
authors.initials: S
authors.lastname: Milana
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Ugo
authors.initials: U
authors.lastname: Sassi
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Matteo
authors.initials: M
authors.lastname: Barbone
authors.affiliation: Electrical Engineering Institute, Ecole Polytechnique Federale de Lausanne , Lausanne CH-1015, Switzerland.
authors.forename: Dumitru
authors.initials: D
authors.lastname: Dumcenco
authors.affiliation: Electrical Engineering Institute, Ecole Polytechnique Federale de Lausanne , Lausanne CH-1015, Switzerland.
authors.forename: Kolyo
authors.initials: K
authors.lastname: Marinov
authors.affiliation: Electrical Engineering Institute, Ecole Polytechnique Federale de Lausanne , Lausanne CH-1015, Switzerland.
authors.forename: Andras
authors.initials: A
authors.lastname: Kis
authors.affiliation: Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
authors.forename: Andrea C
authors.initials: AC
authors.lastname: Ferrari
keywords: MoS2; flexible optoelectronics; graphene; heterostructures; photodetectors