title: Engineering the Charge Transfer in all 2D Graphene-Nanoplatelets Heterostructure Photodetectors.
abstract: Two dimensional layered (i.e. van der Waals) heterostructures open up great prospects, especially in photodetector applications. In this context, the control of the charge transfer between the constituting layers is of crucial importance. Compared to bulk or 0D system, 2D materials are characterized by a large exciton binding energy (0.1-1 eV) which considerably affects the magnitude of the charge transfer. Here we investigate a model system made from colloidal 2D CdSe nanoplatelets and epitaxial graphene in a phototransistor configuration. We demonstrate that using a heterostructured layered material, we can tune the magnitude and the direction (i.e. electron or hole) of the charge transfer. We further evidence that graphene functionalization by nanocrystals only leads to a limited change in the magnitude of the 1/f noise. These results draw some new directions to design van der Waals heterostructures with enhanced optoelectronic properties.
authors.affiliation: Laboratoire de Physique et d'Étude des Matériaux, PSL Research University, CNRS UMR 8213, Sorbonne Universités UPMC Univ Paris 06, ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France.|Nexdot, 10 rue Vauquelin, 75005 Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Robin
authors.affiliation: Nexdot, 10 rue Vauquelin, 75005 Paris, France.|UPMC -CNRS UMR 7588, Institut des Nano-Sciences de Paris (INSP), 4 place Jussieu, 75005 Paris, France.
authors.forename: E
authors.initials: E
authors.lastname: Lhuillier
authors.affiliation: Laboratoire de Physique et d'Étude des Matériaux, PSL Research University, CNRS UMR 8213, Sorbonne Universités UPMC Univ Paris 06, ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France.
authors.forename: X Z
authors.initials: XZ
authors.lastname: Xu
authors.affiliation: Laboratoire de Physique et d'Étude des Matériaux, PSL Research University, CNRS UMR 8213, Sorbonne Universités UPMC Univ Paris 06, ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Ithurria
authors.affiliation: Laboratoire de Physique et d'Étude des Matériaux, PSL Research University, CNRS UMR 8213, Sorbonne Universités UPMC Univ Paris 06, ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France.
authors.forename: H
authors.initials: H
authors.lastname: Aubin
authors.affiliation: Laboratoire de Photonique et Nanostructures, CNRS, Route de Nozay, 91460, Marcoussis, France.
authors.forename: A
authors.initials: A
authors.lastname: Ouerghi
authors.affiliation: Laboratoire de Physique et d'Étude des Matériaux, PSL Research University, CNRS UMR 8213, Sorbonne Universités UPMC Univ Paris 06, ESPCI ParisTech, 10 rue Vauquelin, 75005 Paris, France.
authors.forename: B
authors.initials: B
authors.lastname: Dubertret