AVS 64th International Symposium & Exhibition
    2D Materials Focus Topic Wednesday Sessions
       Session 2D-WeA

Paper 2D-WeA2
Modification of Density of States in Iron Chloride Intercalated Epitaxial Graphene with Electric Bias

Wednesday, November 1, 2017, 2:40 pm, Room 15

Session: Properties and Characterization of 2D Materials
Presenter: Michael Williams, Clark Atlanta University
Authors: K.D. McAllister, Clark Atlanta University
A.P. Sharma, Clark Atlanta University
K. Shepperd, Georgia Institute of Technology
E.H. Conrad, Georgia Institute of Technology
M.D. Williams, Clark Atlanta University
Correspondent: Click to Email
Epitaxial semi-metallic graphene on the carbon face of silicon carbide has mixed phase AA and AB stacking orders. Iron chloride intercalated graphene is characterized, by contrast, with AA stacking order. The high electronegativity of the iron chloride spacing layers between the graphene bi-layer results in hole-doping of the graphene. Ultraviolet photoemission spectroscopy is used to investigate the electronic structure modifications of stage-1 and stage-3 iron chloride intercalated bi-layer graphene with the application of an external electric field normal to the surface. The dominant features of the study are the modification of the work function and the density of states with the applied electric field and staging order of the intercalant. In particular, the p-type carriers of the stage-1 system are switched to n-type behavior with increasing field strength in agreement with recent models.