Molecular orientation in thin films of bis(1,2,5-thiadiazolo)-<i>p</i>-quinobis(1,3-dithiole) on graphite studied by angle-resolved photoelectron spectroscopy

Hasegawa, Shinji; Tanaka, Shoji; Yamashita, Yoshiro; Inokuchi, Hiroo; Fujimoto, Hitoshi; Kamiya, Kōji; Seki, Kazuhiko; Ueno, Nobuo

doi:10.1103/physrevb.48.2596

Cited by 77 publications

(42 citation statements)

References 24 publications

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“…HOMO WL and HOMO ML are nondispersive, as expected for weakly interacting molecules growing in a somewhat disordered fashion on the Au(111) surface as observed by scanning tunneling microscopy (STM) [38]. Due to the angle dependence of photoemission selection rules, the intensity of HOMO WL reaches a maximum at this angle, characteristic of VONc molecules lying flat on the substrate [29,[39][40][41]. This adsorption geometry is also in agreement with calculations and STM data at coverages below one monolayer [29,38].…”

Section: Identification and Overview Of Spectralmentioning

confidence: 97%

Electronic structure and dynamics of quasi-2D states of vanadyl naphthalocyanine on Au(111)^†

2013

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We investigate the evolution of the interfacial electronic structure and dynamics of thin films of the organic semiconductor vanadyl naphthalocyanine on Au(111). Using angle-resolved two-photon photoemission, a comprehensive coverage-and excitation-energy-dependent characterisation of the electronic structure and the resulting dynamics of short-lived image potential resonances (IPRs) on Au(111) are presented. The study of these quasi-two-dimensional (quasi-2D) bands is enabled by molecular adsorption and reveals a significant lengthening of their lifetimes. The resonances remain, however, significantly coupled to the continuum of bulk bands of Au(111) even in the presence of the organic adsorbate, giving rise to Fano-like quantum interference and 'intensity switching' effects. Coupling to the continuum is also responsible for providing excitation pathways to the image potential manifold above and below optical resonance with the Shockley surface state. The organic semiconductor interface and quasi-2D bands investigated here provide a model for understanding the role of quantum effects in ultrafast dynamics of confined systems and at interfaces such as those that are relevant e.g. for interfacial charge-transfer processes in organic electronics.

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Section: Identification and Overview Of Spectralmentioning

confidence: 97%

Electronic structure and dynamics of quasi-2D states of vanadyl naphthalocyanine on Au(111)^†

2013

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“…The photoemission intensity for the "f-LUMO" exhibits a distinct angledependence (Figure 6a), in agreement with the molecular origin of this state. This is likely the result of photoemission selection rules in structured thin films with well-organized adsorption geometries [23,47]. This indicates that the "f-LUMO" arises from ordered molecular structures on the surface, which from the STM data in Figure 3 are associated with the high-density hexagonally packed "Cl-up" molecules directly at the metal interface.…”

Section: Summary Ofmentioning

confidence: 98%

Interplay of local and global interfacial electronic structure of a strongly coupled dipolar organic semiconductor

Ilyas

Monti

2014

Phys. Rev. B

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We investigate the consequences of strong electronic coupling at the organic semiconductor / metal interface in both the ground and excited state manifold for the case of chloro-boron subphthalocyanine on Cu(111). Using a combination of low-temperature scanning tunneling microscopy, ultraviolet and angle-resolved two-photon photoemission spectroscopy, we are able to connect local electronic interactions at the interface with thin film structure despite complex growth in the sub-monolayer regime. We show that strong coupling leads to charge-transfer from the surface to the molecule and are able to correlate this observation with the specific molecular adsorption geometry. Strong coupling further results in molecular excited state anion resonances and is responsible for autoionization of highly excited image potential states, reporting on the heterogeneous electronic environment in these thin films. This study provides a step towards disentangling interfacial electronic interactions at complex organic / metal interfaces.3

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“…For the final-state contribution, the study on how the scattering of low-energy photoelectron can be treated for light-element materials is important. Hasegawa et al [14] demonstrated that the PAD of valence-band photoelectron intensity of bis(1,2,5-thiadiazolo)-p-quinobis(1,3-dithiole) (BTQBT) thin film on graphite is excellently explained by a calculated angular distribution using independent-atomic-center (IAC) approximations combined with molecular orbital calculation (IAC/MO) [15]. This is the first meaningful quantitative analysis of photoelectron angular distribution for large and complex organic molecules.…”

Section: Calculationmentioning

confidence: 99%

Impact of molecular orbital distribution on photoelectron intensity for picene film

Liu

Ikeda

Nagamatsu

et al. 2014

Journal of Electron Spectroscopy and Related Phenomena

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Molecular orientation in thin films of bis(1,2,5-thiadiazolo)-p-quinobis(1,3-dithiole) on graphite studied by angle-resolved photoelectron spectroscopy

Cited by 77 publications

References 24 publications

Electronic structure and dynamics of quasi-2D states of vanadyl naphthalocyanine on Au(111)^†

Electronic structure and dynamics of quasi-2D states of vanadyl naphthalocyanine on Au(111)^†

Interplay of local and global interfacial electronic structure of a strongly coupled dipolar organic semiconductor

Impact of molecular orbital distribution on photoelectron intensity for picene film

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Molecular orientation in thin films of bis(1,2,5-thiadiazolo)-p-quinobis(1,3-dithiole) on graphite studied by angle-resolved photoelectron spectroscopy

Cited by 77 publications

References 24 publications

Electronic structure and dynamics of quasi-2D states of vanadyl naphthalocyanine on Au(111)†

Electronic structure and dynamics of quasi-2D states of vanadyl naphthalocyanine on Au(111)†

Interplay of local and global interfacial electronic structure of a strongly coupled dipolar organic semiconductor

Impact of molecular orbital distribution on photoelectron intensity for picene film

Contact Info

Product

Resources

About

Electronic structure and dynamics of quasi-2D states of vanadyl naphthalocyanine on Au(111)^†

Electronic structure and dynamics of quasi-2D states of vanadyl naphthalocyanine on Au(111)^†