Comparison of Ultraviolet Photoelectron Spectroscopy and Scanning Tunneling Spectroscopy Measurements on Highly Ordered Ultrathin Films of Hexa-peri-hexabenzocoronene on Au (111)
作者： Holger Proehl , Michael Toerker , Farid Sellam , Torsten Fritz , Karl Leo
DOI: 10.1103/PHYSREVB.63.205409
关键词: Dipole 、 Fermi level 、 Atomic physics 、 Electronic structure 、 Absorption (electromagnetic radiation) 、 Scanning tunneling spectroscopy 、 Ultraviolet photoelectron spectroscopy 、 Scanning tunneling microscope 、 Vacuum level 、 Materials science 、 Analytical chemistry
摘要: Hexa-peri-hexabenzocoronene $({\mathrm{C}}_{42}{\mathrm{H}}_{18},$ HBC) films adsorbed on the Au(111) surface were investigated by means of ultraviolet photoelectron spectroscopy (UPS) and scanning tunneling (STS). The results show that both methods give comparable for electronic structure occupied states, if STS is performed at appropriate parameters. Additionally, gives an immediate insight into unoccupied states. highest state multilayer found 1.3\char21{}1.4 eV below Fermi levels lowest 1.8 above level. resulting transport gap compared to optical absorption measurements. Work-function changes -0.8 indicate interface dipole, i.e., vacuum level alignment does not occur HBC-Au interface. Compared UPS, voltage range measurements limited prevent sample damage.
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