Tuning the Work Function of Graphene-on-Quartz with a High Weight Molecular Acceptor
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- 作者：C. Christodoulou ; A. Giannakopoulos ; M. V. Nardi ; G. Ligorio ; M. Oehzelt ; L. Chen ; L. Pasquali ; M. Timpel ; A. Giglia ; S. Nannarone ; P. Norman ; M. Linares ; K. Parvez ; K. M眉llen ; D. Beljonne ; N. Koch
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：March 6, 2014
- 年：2014
- 卷：118
- 期：9
- 页码：4784-4790
- 全文大小：445K
- 年卷期：v.118,no.9(March 6, 2014)
- ISSN：1932-7455
文摘
Ultraviolet and X-ray photoelectron spectroscopies in combination with density functional theory (DFT) calculations were used to study the change in the work function (桅) of graphene, supported by quartz, as induced by adsorption of hexaazatriphenylene鈥揾exacarbonitrile (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 桅 from 4.5 eV up to 5.7 eV, rendering the molecularly modified graphene-on-quartz a highly suitable hole injection electrode.