Unoccupied electronic states of Au(113): Theory and experiment

Häberle, Patricio; Ibañez, W.; Esparza, Rolando; Vargas, P.

doi:10.1103/physrevb.63.235412

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…The window that accepts the photons into the Geiger–Müller tube is a polished SrF 2 disc. The combination of the band gap of the window and the ionization potential of iodine makes this detector highly sensitive to photons in a very narrow band around 9.5 ± 0.2 eV . The angle between the electron gun and the Geiger–Müller detector is ∼45°.…”

Section: Methodsmentioning

confidence: 99%

“…The combination of the band gap of the window and the ionization potential of iodine makes this detector highly sensitive to photons in a very narrow band around 9.5 ± 0.2 eV. 32 The angle between the electron gun and the Geiger− Muller detector is ∼45°. The sample is mounted on a goniometer with both an azimuthal rotation and a rotation through an angle theta (θ) around an axis in the plane of the sample.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Unoccupied Interface and Molecular States in Thiol and Dithiol Monolayers

et al. 2017

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The electronic structure of self-assembled monolayers (SAMs) formed by thiols of different lengths and dithiol molecules bound to Au(111) has been characterized. Inverse photoemission spectroscopy (IPES) and density functional theory have been used to describe the molecule/Au substrate system. All molecular layers display a clear signal in the IPES data at the edge of the lowest unoccupied system orbital (LUSO), roughly 3 eV above the Fermi level. There is also evidence, in both the experimental data and the calculation, of a finite density of states just below the LUSO edge, which has been recognized as localized at the Au-substrate interface. Regardless of the molecular lengths and in addition to this induced density of interface states, an apparent antibonding Au-S state has been identified in the IPES data for both molecular systems. The main difference between the electronic structures of thiol and dithiol SAMs is a shift in the energy of the antibonding state.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Unoccupied Interface and Molecular States in Thiol and Dithiol Monolayers

et al. 2017

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“…The Co and Au substrates provide different spectral shapes also in the IPS (conduction band) region: Co has a single feature close to the Fermi edge, while Au has a multitude of features, which belong to different orientations of its polycrystalline surface. 27 The spectra obtained for subsequent CuPc deposition were fitted with three Gaussian peaks. The closest one to the Fermi level represents the lowest unoccupied molecular orbital (LUMO).…”

Section: Resultsmentioning

confidence: 99%

Transport band gap opening at metal–organic interfaces

Haidu

Salvan

Zahn

et al. 2014

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The interface formation between copper phthalocyanine (CuPc) and two representative metal substrates, i.e., Au and Co, was investigated by the combination of ultraviolet photoelectron spectroscopy and inverse photoelectron spectroscopy. The occupied and unoccupied molecular orbitals and thus the transport band gap of CuPc are highly influenced by film thickness, i.e., molecule substrate distance. Due to the image charge potential given by the metallic substrates the transport band gap of CuPc "opens" from (1.4 ± 0.3) eV for 1 nm thickness to (2.2 ± 0.3) eV, and saturates at this value above 10 nm CuPc thickness. The interface dipoles with values of 1.2 eV and 1.0 eV for Au and Co substrates, respectively, predominantly depend on the metal substrate work functions. X-ray photoelectron spectroscopy measurements using synchrotron radiation provide detailed information on the interaction between CuPc and the two metal substrates. While charge transfer from the Au or Co substrate to the Cu metal center is present only at sub-monolayer coverages, the authors observe a net charge transfer from the molecule to the Co substrate for films in the nm range. Consequently, the Fermi level is shifted as in the case of a p-type doping of the molecule. This is, however, a competing phenomenon to the energy band shifts due to the image charge potential.

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“…The intensity of emitted photons is closely dependent on the unoccupied density of states (uDOS). Measurements were performed in a home built isochromat spectrometer [7].…”

Section: Methodsmentioning

confidence: 99%

Inverse photoemission spectroscopy of multiwall carbon nanotubes

Hevia¹,

Ibañez²,

Segura³

et al. 2006

Braz. J. Phys.

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Multiwall Carbon Nanotubes (MWCNTs) were synthesized by Chemical Vapor Deposition (CVD). Two different procedures were used to grow MWCNT films roughly, aligned in the direction normal to the SiO 2 /Si(111) substrate. Inverse Photoemission Spectroscopy measurements, on these samples, show the existence of resonances which could be traced back to a flat graphene sheet. The unoccupied valence band is fairly similar to that shown by graphite except by an additional intensity in the vicinity of the Fermi level. This resonance could be interpreted both as tubes tips end effects or van Hove singularities in the density of states.

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Unoccupied electronic states of Au(113): Theory and experiment

Abstract: We present results from Inverse photoemission spectroscopy in the isochromat mode, with angular resolution, from the clean Au (113)

Cited by 7 publications

References 22 publications

Unoccupied Interface and Molecular States in Thiol and Dithiol Monolayers

Unoccupied Interface and Molecular States in Thiol and Dithiol Monolayers

Transport band gap opening at metal–organic interfaces

Inverse photoemission spectroscopy of multiwall carbon nanotubes

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