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Title: Doping mechanisms in graphene-MoS{sub 2} hybrids

We present a joint theoretical and experimental investigation of charge doping and electronic potential landscapes in hybrid structures composed of graphene and semiconducting single layer molybdenum disulfide (MoS{sub 2}). From first-principles simulations, we find electron doping of graphene due to the presence of rhenium impurities in MoS{sub 2}. Furthermore, we show that MoS{sub 2} edges give rise to charge reordering and a potential shift in graphene, which can be controlled through external gate voltages. The interplay of edge and impurity effects allows the use of the graphene-MoS{sub 2} hybrid as a photodetector. Spatially resolved photocurrent signals can be used to resolve potential gradients and local doping levels in the sample.
Authors:
;  [1] ; ; ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [6]
  1. I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, D-20355 Hamburg (Germany)
  2. School of Physics and Astronomy, University of Manchester, M13 9PL Manchester (United Kingdom)
  3. Institut für Theoretische Physik, Universität Bremen, Otto-Hahn-Allee 1, D-28359 Bremen (Germany)
  4. (Germany)
  5. Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL (United Kingdom)
  6. Institute for Molecules and Materials, Radboud University of Nijmegen, Heijendaalseweg 135, 6525 AJ Nijmegen (Netherlands)
Publication Date:
OSTI Identifier:
22253691
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 25; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; ELECTRIC POTENTIAL; ELECTRONS; GRAPHENE; HYBRIDIZATION; IMPURITIES; MOLYBDENUM SULFIDES; POTENTIALS; RHENIUM; SIGNALS