Doping efficiency of single and randomly stacked bilayer graphene by iodine adsorption

Journal Article · Mon Jul 07 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4889747· OSTI ID:22303939

Kim, HoKwon; Renault, Olivier; Rouchon, Denis; Mariolle, Denis; Chevalier, Nicolas ^[1]; Tyurnina, Anastasia; Simonato, Jean-Pierre; Dijon, Jean ^[2]

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1. Univ. Grenoble Alpes, F-38000 Grenoble, France and CEA, LETI, MINATEC Campus, F-38054 Grenoble (France)
2. Univ. Grenoble Alpes, F-38000 Grenoble, France and CEA, LITEN, Minatec Campus, F-38054 Grenoble (France)

We report on the efficiency and thermal stability of p-doping by iodine on single and randomly stacked, weakly coupled bilayer polycrystalline graphene, as directly measured by photoelectron emission microscopy. The doping results in work function value increase of 0.4–0.5 eV, with a higher degree of iodine uptake by the bilayer (2%) as compared to the single layer (1%) suggesting iodine intercalation in the bilayer. The chemistry of iodine is identified accordingly as I{sub 3}{sup −} and I{sub 5}{sup −} poly iodide anionic complexes with slightly higher concentration of I{sub 5}{sup −} in bilayer than monolayer graphene, likely attributed to differences in doping mechanisms. Temperature dependent in-situ annealing of the doped films demonstrated that the doping remains efficient up to 200 °C.

• OSTI ID: 22303939
• Journal Information: Applied Physics Letters, Vol. 105, Issue 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORPTION
ANNEALING
CLATHRATES
DOPED MATERIALS
ECOLOGICAL CONCENTRATION
EFFICIENCY
EMISSION SPECTROSCOPY
FILMS
GRAPHENE
IODIDES
IODINE ADDITIONS
LAYERS
PHOTOELECTRON SPECTROSCOPY
POLYCRYSTALS
P-TYPE CONDUCTORS
RANDOMNESS
STABILITY
TEMPERATURE DEPENDENCE
WORK FUNCTIONS