Influence of intramolecular polar bonds on interface energetics in perfluoro-pentacene on Ag(111)

被引：66

作者：

Duhm, Steffen ^{[1
]}

Hosoumi, Shunsuke ^{[1
]}

Salzmann, Ingo ^{[2
]}

Gerlach, Alexander ^{[3
]}

Oehzelt, Martin ^{[4
]}

Wedl, Bernhard ^{[2
,5
]}

Lee, Tien-Lin ^{[6
]}

Schreiber, Frank ^{[3
]}

Koch, Norbert ^{[2
]}

Ueno, Nobuo ^{[1
]}

Kera, Satoshi ^{[1
]}

机构：

[1] Chiba Univ, Grad Sch Adv Integrat Sci, Inage Ku, Chiba 2638522, Japan

[2] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[3] Univ Tubingen, Inst Angew Phys, D-72076 Tubingen, Germany

[4] Univ Linz, Inst Expt Phys, A-4040 Linz, Austria

[5] Graz Univ Technol, Inst Festkorperphys, A-8010 Graz, Austria

[6] European Synchrotron Radiat Facil, F-38043 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 04期

基金：

奥地利科学基金会;

关键词：

ENERGY-LEVEL ALIGNMENT; MOLECULAR-BEAM DEPOSITION; ORGANIC THIN-FILMS; ELECTRONIC-STRUCTURE; GROWTH; CONFORMATION; GRAPHITE; DIPOLE; STATES;

D O I：

10.1103/PhysRevB.81.045418

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigated the structural and electronic properties of vacuum sublimed perfluoro-pentacene (PFP) thin films on Ag(111) substrates using x-ray standing waves (XSW), x-ray diffraction (XRD) and ultraviolet photoelectron spectroscopy (UPS). XSW results reveal a flat adsorption geometry of the monolayer PFP/Ag(111) with a relatively large bonding distance of 3.16 angstrom for both, the carbon and fluorine atoms. Multilayers PFP/Ag(111) adopt a herringbone structure with the molecular long axis parallel to the substrate and a vertical lattice spacing of 3.06 angstrom as evidenced by XRD. The strong intramolecular polar bond character of the fluorine-carbon bonds in PFP leads to an orientation dependent ionization energy (IE) that is experimentally observed by UPS for the monolayer-multilayer transition: The inclined molecular plane orientation in the multilayer herringbone arrangement leads to an increase of the PFP IE by >0.4 eV compared to the flat lying monolayer.

引用

页数：6

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