The interplay between molecular orientation, film morphology and luminescence properties of tetracene thin films on epitaxial AlOx/Ni3Al(111)

Soubatch, Serguei; Temirov, Ruslan; Weinhold, Marcel; Tautz, F. Stefan

doi:10.1016/j.susc.2006.07.039

Cited by 12 publications

(25 citation statements)

References 44 publications

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“…Since COMs like Tc have highly anisotropic electronic and chemical structures, their orientation at the interface is of particular importance to achieve an interface morphology that favors efficient IET. As an example, the IET-competing luminescence of Tc on an ultrathin alumina AlO x layer on Ni 3 Al(111) is completely quenched if the molecules are planar or are at least only moderately inclined with respect to the surface, while the luminescence persists for larger Tc inclinations. − This behavior is attributed to the fact that a smaller Tc inclination gives rise to an increased overlap of π orbitals (located above and below the planar Tc core) and the wave function tails of the metal states facilitating, thus, an efficient IET from Tc to the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…Tc structure formation has been widely studied on several different weakly interacting surfaces, including H–Si, ,,− Si oxide, ,,− AlO x /Ni 3 Al(111), − polystyrene, parylene C, poly(methyl methacrylate), hexamethyldisilazane, Mylar, evaporated carbon, and highly oriented pyrolytic graphite . Thanks to the weak coupling to the substrates, the results are largely transferable.…”

Section: Introductionmentioning

confidence: 99%

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Tetracene Ultrathin Film Growth on Hydrogen-Passivated Silicon

et al. 2020

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Inorganic−organic interfaces are important for enhancing the power conversion efficiency of silicon-based solar cells through singlet exciton fission (SF). We elucidated the structure of the first monolayers of tetracene (Tc), an SF molecule, on hydrogen-passivated Si( 111) ] and hydrogenated amorphous Si (a-Si:H) by combining near-edge X-ray absorption fine structure (NEXAFS) and Xray photoelectron spectroscopy (XPS) experiments with density functional theory (DFT) calculations. For samples grown at or below substrate temperatures of 265 K, the resulting ultrathin Tc films are dominated by almost upright-standing molecules. The molecular arrangement is very similar to the Tc bulk phase, with only a slightly higher average angle between the conjugated molecular plane normal and the surface normal (α) around 77°. Judging from carbon K-edge X-ray absorption spectra, the orientation of the Tc molecules are almost identical when grown on H−Si(111) and a-Si:H substrates as well as for (sub)mono-to several-monolayer coverages. Annealing to room temperature, however, changes the film structure toward a smaller α of about 63°. A detailed DFT-assisted analysis suggests that this structural transition is correlated with a lower packing density and requires a well-chosen amount of thermal energy. Therefore, we attribute the resulting structure to a distinct monolayer configuration that features less inclined, but still well-ordered molecules. The larger overlap with the substrate wave functions makes this arrangement attractive for an optimized interfacial electron transfer in SF-assisted silicon solar cells.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tetracene Ultrathin Film Growth on Hydrogen-Passivated Silicon

et al. 2020

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“…[1][2][3][4][5][6][7][8] It is a comparatively neglected member of the acene family compared to its neighbors anthracene and pentacene, but it is gaining wider attention and light-emitting field-effect transistors have also been recently realized. [1][2][3][4][5][6][7][8] It is a comparatively neglected member of the acene family compared to its neighbors anthracene and pentacene, but it is gaining wider attention and light-emitting field-effect transistors have also been recently realized.…”

Section: Introductionmentioning

confidence: 99%

Dielectric tensor of tetracene single crystals: The effect of anisotropy on polarized absorption and emission spectra

Tavazzi

Raimondo

Silvestri

et al. 2008

The Journal of Chemical Physics

101

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The full UV-visible dielectric tensor and the corresponding directions of the principal axes of triclinic tetracene crystals are reported as deduced either by polarized absorption and ellipsometry measurements or by calculations based on the molecular and crystallographic data. The results allow the attribution of the polarized bands observed in both absorption and photoluminescence emission spectra. In particular, the spectral line shape and polarization of the emission are found to depend on the sample thickness, and the effect is attributed to the modification of the state of polarization of the emitted light during its propagation inside the crystal. Indeed, the directions of polarization of the lowest optical transitions and the directions of the principal axes of the dielectric tensor are demonstrated not to coincide, in contrast to the assumptions typically made in the literature, thus causing the mixed transverse/longitudinal character of light propagation.

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“…C1s spectra showed strong extra peaks at 283.1 eV and 285~286 eV in addition to the peak 284.3 eV belonging to tetracene 12 . O1s signal intensity was comparable to C1s.…”

Section: (D)mentioning

confidence: 98%

Strong Pressure Effect in the Sublimation from Tetracene Single Crystals and Development of Surface Cleaning Technique for Organic Semiconductors

Ohtomo

Itaka

Hasegawa

et al. 2011

Appl. Phys. Express

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We studied the sublimation of tetracene single crystals under vacuum and 1 atm inert gas to develop the surface cleaning technique for organic semiconductors. It was found that the microscopic sublimation behavior is strongly dependent on the gas pressure.Nanometer-scale roughening is observed after heating in vacuum, while layer-by-layer sublimation was observed under 1 atm Ar gas. Reflection high energy electron diffraction of the topmost surface showed streak patterns, which shows surface contaminants were successfully removed.

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The interplay between molecular orientation, film morphology and luminescence properties of tetracene thin films on epitaxial AlOx/Ni3Al(111)

Cited by 12 publications

References 44 publications

Tetracene Ultrathin Film Growth on Hydrogen-Passivated Silicon

Tetracene Ultrathin Film Growth on Hydrogen-Passivated Silicon

Dielectric tensor of tetracene single crystals: The effect of anisotropy on polarized absorption and emission spectra

Strong Pressure Effect in the Sublimation from Tetracene Single Crystals and Development of Surface Cleaning Technique for Organic Semiconductors

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