Interface Dipole and Growth Mode of Partially and Fully Fluorinated Rubrene on Au(111) and Ag(111)

Anger, F.; Glowatzki, H.; Franco-Cañellas, Antoni; Bürker, Christoph; Gerlach, Alexander; Scholz, Reinhard; Sakamoto, Youichi; Suzuki, Toshiyasu; Koch, Norbert; Schreiber, Frank

doi:10.1021/jp511822g

Cited by 13 publications

(26 citation statements)

References 45 publications

(82 reference statements)

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“…For examining the impact of n e on eventual CT, we also estimate the density ρ (e•cm −2 ) of charge transferred into the LUMO levels of F 6 TCNNQ molecules adsorbed on ML-MoS 2 by using the measured ΔΦ and VBM shift (ΔVBM), according to the Helmholtz equation 45,46 :…”

Section: Impact Of Ct On Work Function and Valence Electronic Levelsmentioning

confidence: 99%

Demonstration of the key substrate-dependent charge transfer mechanisms between monolayer MoS2 and molecular dopants

Park

Schultz

et al. 2019

Commun Phys

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Tuning the Fermi level (E F ) in two-dimensional transition metal dichalcogenide (TMDC) semiconductors is crucial for optimizing their application in (opto-)electronic devices. Doping by molecular electron acceptors and donors has been suggested as a promising method to achieve E F -adjustment. Here, we demonstrate that the charge transfer (CT) mechanism between TMDC and molecular dopant depends critically on the electrical nature of the substrate as well as its electronic coupling with the TMDC. Using angle-resolved ultraviolet and X-ray photoelectron spectroscopy, we reveal three fundamentally different, substratedependent CT mechanisms between the molecular electron acceptor 1,3,4,5,7,8-hexafluorotetracyano-naphthoquinodimethane (F 6 TCNNQ) and a MoS 2 monolayer. Our results demonstrate that any substrate that acts as charge reservoir for dopant molecules can prohibit factual doping of a TMDC monolayer. On the other hand, the three different CT mechanisms can be exploited for the design of advanced heterostructures, exhibiting tailored electronic properties in (opto-)electronic devices based on two-dimensional semiconductors.

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Section: Impact Of Ct On Work Function and Valence Electronic Levelsmentioning

confidence: 99%

Demonstration of the key substrate-dependent charge transfer mechanisms between monolayer MoS2 and molecular dopants

Park

Schultz

et al. 2019

Commun Phys

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“…[5][6][7] One very effective way to tune the electronic properties of a material and at the same time to mitigate the molecular reactivity with oxygen 8 is fluorination, since fluorine is the most electronegative element. [9][10][11][12][13] While the optical properties as well as the energy level alignment of perfluororubrene (C 42 F 28 , PF-RUB) have already been studied, 12,14,15 a characterization of the molecular vibrations is still lacking. The vibrational modes, however, are fundamental properties of a molecule that play an important role for the understanding of molecular charge carrier transport properties.…”

Section: Introductionmentioning

confidence: 99%

Vibrational modes and changing molecular conformation of perfluororubrene in thin films and solution

Anger

Scholz

Gerlach

et al. 2015

The Journal of Chemical Physics

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We investigate the vibrational properties of perfluororubrene (PF-RUB) in thin films on silicon wafers with a native oxide layer as well as on silicon wafers covered with a self-assembled monolayer and in dichloromethane solution. In comparison with computed Raman and IR spectra, we can assign the molecular modes and identify two molecular conformations with twisted and planar tetracene backbones of the molecule. Moreover, we employ Raman imaging techniques to study the morphology and distribution of the molecular conformation in PF-RUB thin films.

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“…For the sake of completeness, we shall mention that the influence of fluorination on the metal-organic interface has been studied also for phthalocyanines 385,[493][494][495][496] , rubrene 497 and thiophenes 498 . Of course not only (111) surfaces, but also several others have been studied, e.g., PFP on Ag(110) 499 or F 4 PEN on Au(100) 500,501 .…”

Section: Fluorinationmentioning

confidence: 99%

Binding and Electronic Level Alignment of $\boldsymbolπ$-Conjugated Systems on Metals

Franco-Cañellas,

Duhm,

Gerlach

et al. 2020

Preprint

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We review the binding and energy level alignment of π-conjugated systems on metals, a field which during the last two decades has seen tremendous progress both in terms of experimental characterization as well as in the depth of theoretical understanding. Precise measurements of vertical adsorption distances and the electronic structure together with ab-initio calculations have shown that most of the molecular systems have to be considered as intermediate cases between weak physisorption and strong chemisorption. In this regime, the subtle interplay of different effects such as covalent bonding, charge transfer, electrostatic and van der Waals interactions yields a complex situation with different adsorption mechanisms. In order to establish a better understanding of the binding and the electronic level alignment of π-conjugated molecules on metals, we provide an up-to-date overview of the literature, explain the fundamental concepts as well as the experimental techniques and discuss typical case studies. Thereby, we relate the geometric with the electronic structure in a consistent picture and cover the entire range from weak to strong coupling.

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Interface Dipole and Growth Mode of Partially and Fully Fluorinated Rubrene on Au(111) and Ag(111)

Cited by 13 publications

References 45 publications

Demonstration of the key substrate-dependent charge transfer mechanisms between monolayer MoS2 and molecular dopants

Demonstration of the key substrate-dependent charge transfer mechanisms between monolayer MoS2 and molecular dopants

Vibrational modes and changing molecular conformation of perfluororubrene in thin films and solution

Binding and Electronic Level Alignment of $\boldsymbolπ$-Conjugated Systems on Metals

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