title: Doping characteristics of iodine on as-grown chemical vapor deposited graphene on Pt.
abstract: Using laboratory X-ray photoelectron emission microscopy (XPEEM), we investigated the doping efficiency and thermal stability of iodine on as-grown graphene on Pt. After iodine adsorption of graphene in saturated vapor of I2, monolayer and bilayer graphene exhibited work function of 4.93 eV and 4.87 eV, respectively. Annealing of the doped monolayer graphene at 100 °C led to desorption of hydrocarbons, which increased the work function of monolayer graphene by ~0.2 eV. The composition of the polyiodide complexes evolved upon a step-by-step annealing at temperatures from 100 °C to 300 °C while the work-function non-monotonically changed with decreasing iodine content. The iodine dopant was stable at relatively high temperature as a significant amount of iodine remained up to the annealing temperature of 350 °C.
authors.affiliation: Université Grenoble Alpes, F-38000 Grenoble, France; CEA, LETI, MINATEC Campus, 17 rue des Martyrs, F-38054 Grenoble, France. Electronic address: hknano@gmail.com.
authors.forename: HoKwon
authors.initials: H
authors.lastname: Kim
authors.affiliation: Université Grenoble Alpes, F-38000 Grenoble, France; CEA, LETI, MINATEC Campus, 17 rue des Martyrs, F-38054 Grenoble, France.
authors.forename: Olivier
authors.initials: O
authors.lastname: Renault
authors.affiliation: Université Grenoble Alpes, F-38000 Grenoble, France; CEA, LITEN/DTMN, F-38054 Grenoble, France.
authors.forename: Anastasia
authors.initials: A
authors.lastname: Tyurnina
authors.affiliation: Université Grenoble Alpes, F-38000 Grenoble, France; CEA, LITEN/DTMN, F-38054 Grenoble, France.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Guillet
authors.affiliation: Université Grenoble Alpes, F-38000 Grenoble, France; CEA, LITEN/DTMN, F-38054 Grenoble, France.
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Simonato
authors.affiliation: Université Grenoble Alpes, F-38000 Grenoble, France; CEA, LETI, MINATEC Campus, 17 rue des Martyrs, F-38054 Grenoble, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Rouchon
authors.affiliation: Université Grenoble Alpes, F-38000 Grenoble, France; CEA, LETI, MINATEC Campus, 17 rue des Martyrs, F-38054 Grenoble, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Mariolle
authors.affiliation: Université Grenoble Alpes, F-38000 Grenoble, France; CEA, LETI, MINATEC Campus, 17 rue des Martyrs, F-38054 Grenoble, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Chevalier
authors.affiliation: Université Grenoble Alpes, F-38000 Grenoble, France; CEA, LITEN/DTMN, F-38054 Grenoble, France.
authors.forename: Jean
authors.initials: J
authors.lastname: Dijon
keywords: Electrodes; Graphene; Intercalation; Photoemission microscopy; Work function engineering