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Tuning the Work Function of Graphene-on-Quartz with a High Weight Molecular Acceptor
Humboldt University, Germany .
University of Mons, Belgium .
Humboldt University, Germany .
Humboldt University, Germany .
Vise andre og tillknytning
2014 (engelsk)Inngår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 118, nr 9, s. 4784-4790Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Ultraviolet and X-ray photoelectron spectroscopies in combination with density functional theory (DFT) calculations were used to study the change in the work function (Phi) of graphene, supported by quartz, as induced by adsorption of hexaazatriphenylene-hexacarbonitrile (HATCN). Near edge X-ray absorption fine structure spectroscopy (NEXAFS) and DFT modeling show that a molecular-density-dependent reorientation of HATCN from a planar to a vertically inclined adsorption geometry occurs upon increasing surface coverage. This, in conjunction with the orientation-dependent magnitude of the interface dipole, allows one to explain the evolution of graphene (Phi) from 4.5 eV up to 5.7 eV, rendering the molecularly modified graphene-on-quartz a highly suitable hole injection electrode.

sted, utgiver, år, opplag, sider
American Chemical Society , 2014. Vol. 118, nr 9, s. 4784-4790
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Identifikatorer
URN: urn:nbn:se:liu:diva-106023DOI: 10.1021/jp4122408ISI: 000332756000024OAI: oai:DiVA.org:liu-106023DiVA, id: diva2:712942
Tilgjengelig fra: 2014-04-17 Laget: 2014-04-17 Sist oppdatert: 2017-12-05

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