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Molecular and electronic structure of PTCDA on bilayer graphene on SiC(0001) studied with scanning tunneling microscopy
Author(s) -
Lauffer Peter,
Emtsev Konstantin V.,
Graupner Ralf,
Seyller Thomas,
Ley Lothar
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200879615
Subject(s) - scanning tunneling microscope , bilayer graphene , graphene , monolayer , bilayer , materials science , scanning tunneling spectroscopy , nanotechnology , substrate (aquarium) , scanning probe microscopy , graphene nanoribbons , chemistry , membrane , biochemistry , oceanography , geology
Abstract Epitaxial growth of graphene on SiC surfaces by solid state graphitization is a promising route for future development of graphene based electronics. In the present work we study the morphology and molecular scale structure of monolayer films of 3,4,9,10‐perylene tetracarboxylic dianhydrid (PTCDA) on bilayer graphene on SiC(0001) by scanning tunneling microscopy (STM). First we discuss how the PTCDA molecules adsorb on bilayer graphene. We specially regard the density of PTCDA molecules at monolayer coverage. From the comparison with experiments on HOPG (Au(111) and Ag(110) from literature) we infer a non‐planar adsorption geometry of PTCDA molecules on bilayer graphene. The electronic structure of the surrounding bilayer graphene substrate is investigated via scanning tunneling spectroscopy (STS) and reveals n‐type doping of bilayer graphene during adsorption of PTCDA. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)