Local electronic structure at organic–metal interface studied by UPS, MAES, and first-principles calculation

Aoki, Masaru; Masuda, S.

doi:10.1016/j.elspec.2015.04.005

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…Until now, there are only few studies regarding trans -DBPen (Figure ). Among them are theoretical calculations concerning the mechanism of superconductivity and the bulk structure of trans -DBPen. − Others are electron spectroscopic measurements in a thickness range of 10 monolayers (MLs) up to 100 nm to reveal the behavior upon potassium doping and the electronic properties compared to the parent molecule pentacene for which no superconducting phase has been found. − …”

Section: Introductionmentioning

confidence: 99%

Ordered Growth and Electronic Properties of 1,2:8,9-Dibenzopentacene (trans-DBPen) on Ag(111)

et al. 2018

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Herein, we have studied highly ordered two-dimensional layers of 1,2:8,9-dibenzopentacene (trans-DBPen) adsorbed on a single-crystalline silver surface. While its parent molecule pentacene is known for a relatively high hole mobility, reports on trans-DBPen are rather scarce. Furthermore, it belongs to polycyclic aromatic hydrocarbons for which superconducting properties have been observed upon intercalation with potassium. Our scanning tunneling microscopy and low-energy electron diffraction results reveal a highly ordered monolayer structure of trans-DBPen on Ag(111). We further used angle-resolved ultraviolet photoelectron spectroscopy to measure photoelectron momentum maps (PMMs). The experimental PMMs agree very nicely with simulations based on our structural data while assuming free molecules for the density functional theory calculations. A comparison with pentacene yields some insights into the properties of the two related molecules. We conclude that the degree of hybridization between the molecular orbitals and substrate states is comparatively weak. These results are expected to serve as a starting point for future investigations of K-doped monolayers of trans-DBPen.

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Section: Introductionmentioning

confidence: 99%

Ordered Growth and Electronic Properties of 1,2:8,9-Dibenzopentacene (trans-DBPen) on Ag(111)

et al. 2018

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“…In the gas phase, BOPA-PDCA has a large dipole moment of 12 Debye, and it was shown that multilayer films of BOPA-PCDA decrease the work function of Au(1 1 1) by up to 2 eV [21]. We employ ultraviolet photoelectron spectroscopy (UPS) and metastable atom electron spectroscopy (MAES) [23,24] and find that BOPA-PCDA exhibits a coverage dependent re-orientation of the monolayer from flat lying to upright standing, accompanied by on overall TiO 2 work function decrease by 1.5 eV. In addition, we demonstrate how the insertion of the dye improves the energy-level alignment between the prototypical hole transport material N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) [25][26][27] and TiO 2 for efficient hole extraction.…”

Section: Introductionmentioning

confidence: 99%

Modification of TiO ₂ (1 1 0)/organic hole transport layer interface energy levels by a dipolar perylene derivative

Winkler

Xin

et al. 2018

Electron. Struct.

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Our photoemission study reveals that the work function of TiO 2 (1 1 0) decreases by up to 1.5 eV upon deposition of 9-(bis-(p-(tert-octyl)phenyl)amino)-perylene-3,4-dicarboxylic anhydride (BOPA-PDCA). This effect is attributed to a chemical reaction of TiO 2 (1 1 0) and the molecular anhydride group, as well as the molecular dipole. Analysis of the film thickness dependent photoemission and metastable atom electron spectroscopy data reveals that for low coverage the perylene backbone of BOPA-PDCA is almost parallel to the substrate surface and higher coverage leads to an orientational transition to essentially upright standing molecules. Comparing the energylevel alignment between TiO 2 (1 1 0) and the hole transport materials N,N′-bis(1-naphthyl)-N,N′diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) without and with the BOPA-PDCA interlayer, we find that the perylene derivative has a positive impact on the level alignment for dye-sensitized solar cells with high open-circuit voltages.

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Penning Ionization Electron Spectroscopy

Hosokai

2018

Compendium of Surface and Interface Analysis

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Local electronic structure at organic–metal interface studied by UPS, MAES, and first-principles calculation

Cited by 4 publications

References 40 publications

Ordered Growth and Electronic Properties of 1,2:8,9-Dibenzopentacene (trans-DBPen) on Ag(111)

Ordered Growth and Electronic Properties of 1,2:8,9-Dibenzopentacene (trans-DBPen) on Ag(111)

Modification of TiO ₂ (1 1 0)/organic hole transport layer interface energy levels by a dipolar perylene derivative

Penning Ionization Electron Spectroscopy

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Local electronic structure at organic–metal interface studied by UPS, MAES, and first-principles calculation

Cited by 4 publications

References 40 publications

Ordered Growth and Electronic Properties of 1,2:8,9-Dibenzopentacene (trans-DBPen) on Ag(111)

Ordered Growth and Electronic Properties of 1,2:8,9-Dibenzopentacene (trans-DBPen) on Ag(111)

Modification of TiO 2 (1 1 0)/organic hole transport layer interface energy levels by a dipolar perylene derivative

Penning Ionization Electron Spectroscopy

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Modification of TiO ₂ (1 1 0)/organic hole transport layer interface energy levels by a dipolar perylene derivative