LEED and Optical Spectroscopy Study of an Organic Epitaxial Multilayer Film

Schäfer, A.; Seidel, Christian; Fuchs, Harald

doi:10.1002/1616-3028(200106)11:3<193::aid-adfm193>3.0.co;2-l

Cited by 13 publications

(8 citation statements)

References 10 publications

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“…2(a). A thorough analysis shows that the observed pattern consists of two distinct superstructures, labeled α and β [27]. The simulated patterns based on real-space vectors b 1α and b 2α of the α superstructure and b 1β and b 2β of the β superstructure are marked in Fig.…”

Section: A Structural Properties: Interplay Of Forcesmentioning

confidence: 99%

Charge transfer and symmetry reduction at the CuPc/Ag(110) interface studied by photoemission tomography

et al. 2016

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On the Ag(110) surface copper phthalocyanine (CuPc) orders in two structurally similar superstructures, as revealed by low-energy electron diffraction. Scanning tunneling microscopy (STM) shows that in both superstructures the molecular planes are oriented parallel to the surface and the long molecular axes, defined as diagonals of the square molecule, are rotated by ± 32 • away from the high-symmetry directions [110] and [001] of the silver surface. Similarly to many other adsorbed metal phthalocyanines, the CuPc molecules on Ag(110) appear in STM as crosslike features with twofold symmetry. Photoemission tomography based on angle-resolved photoemission spectroscopy reveals a charge transfer from the substrate into the molecule. A symmetry analysis of experimental and theoretical constant binding energy maps of the photoemission intensity in the k x ,k y-plane points to a preferential occupation of one of the two initially degenerate lowest unoccupied molecular orbitals (LUMOs) of e g symmetry. The occupied e g orbital is rotated by 32 • against the [001] direction of the substrate. The lifting of the degeneracy of the LUMOs and the related reduction of the symmetry of the adsorbed CuPc molecule are attributed to an anisotropy in the chemical reactivity of the Ag(110) surface.

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Section: A Structural Properties: Interplay Of Forcesmentioning

confidence: 99%

Charge transfer and symmetry reduction at the CuPc/Ag(110) interface studied by photoemission tomography

et al. 2016

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“…Longitudinal alignment of Pc columns from primarily alkoxy-substituted metalated phthalocyanines (MPc) can be accomplished with Langmuir–Blodgett deposition, ,− spin-casting, and even spontaneous assembly. − Transverse orientation of Pc aggregates with the plane of the molecule aligned parallel to the substrate plane, an arrangement preferred for solar cell applications, is more difficult. Vapor deposition , and molecular beam epitaxy , of unsubstituted MPc achieved ordered multilayers with the plane of the molecule parallel to the substrate; however, ordering typically extended to only a few molecular layers. Chemically tailored phthalocyanines bearing hydrogen bonding groups within side chains , have shown promise in directing ordered aggregation in layer-by-layer deposition.…”

Section: Introductionmentioning

confidence: 99%

Structural and Electronic Properties of Columnar Supramolecular Assemblies Formed from Ionic Metal-Free Phthalocyanine on Au(111)

Nishida¹,

Wiggins²,

Hipps³

et al. 2011

J. Phys. Chem. C

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Highly ordered assemblies prepared from tetra (4-sulfonatophenyl) phthalocyanine (TSPc) by employing very acidic aqueous solutions were deposited onto Au(111) substrates and studied in UHV using X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), and orbital mediated tunneling spectroscopy (OMTS). XPS of the TSPc aggregates shows that the ratio of protonated to unprotonated nitrogens does not change with decreasing solution pH. STM images of TSPc deposited from pH <1 solutions reveal ordered branched web-like assemblies hundreds of nanometers in length, generally 2 nm tall and having variable widths. High-resolution UHV-STM images of TSPc aggregates on Au(111) reveal detailed coherent columnar architecture with the phthalocyanine macrocycles orientated parallel to the substrate surface. OMTS was used to identify high-energy occupied orbitals, the LUMO of the TSPc aggregates, and the results are contrasted with the same molecular states in unsubstituted metalated phthalocyanines (MPc's). The positions of the filled and the empty states of the TSPc are comparable to those of other unsubstituted MPc's, indicating that the electronegative sulfonate substituents have minimal effect on the electronic properties of the macrocycle in this aggregated state on Au. The HOMOÀLUMO separation of the TSPc is slightly >2 eV, a value consistent with the literature assignments for the Pc ring band gap.

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“…Another mol-ecule well suited for low-dimensional growth is a perylene derivate similar to PTCDA, N , NЈ-dimethylperylene-3,4,9,10-bis͑dicarboximide͒ ͑DiMe-PTCDI͒. [23][24][25][26] Recently this molecule has been found to grow on KBr͑001͒ in form of very long and thin wires. 27 The present paper reviews the results for DiMe-PTCDI on KBr͑001͒ and shows experimental data for another alkali halide surface, NaCl͑001͒, as well as molecular force field calculations analyzing the molecular arrangement of DiMe-PTCDI on both substrates.…”

Section: Introductionmentioning

confidence: 99%

N , N ′ -dimethylperylene-3,4,9,10-bis(dicarboximide) on alkali halide (001) surfaces

Fendrich

Lange

Weiss

et al. 2009

Journal of Applied Physics

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The growth of N,N′-dimethylperylene-3,4,9,10-bis(dicarboximide) (DiMe-PTCDI) on KBr(001) and NaCl(001) surfaces has been studied. Experimental results have been achieved using frequency modulation atomic force microscopy at room temperature under ultrahigh vacuum conditions. On both substrates, DiMe-PTCDI forms molecular wires with a width of 10nm, typically, and a length of up to 600nm at low coverages. All wires grow along either the [110] direction (or [11¯0] direction, respectively) of the alkali halide (001) substrates. There is no wetting layer of molecules: atomic resolution of the substrates can be achieved between the wires. The wires are mobile on KBr but substantially more stable on NaCl. A p(2×2) superstructure in a brickwall arrangement on the ionic crystal surfaces is proposed based on electrostatic considerations. Calculations and Monte Carlo simulations using empirical potentials reveal possible growth mechanisms for molecules within the first layer for both substrates, also showing a significantly higher binding energy for NaCl(001). For KBr, the p(2×2) superstructure is confirmed by the simulations; for NaCl, a less dense, incommensurate superstructure is predicted.

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LEED and Optical Spectroscopy Study of an Organic Epitaxial Multilayer Film

Cited by 13 publications

References 10 publications

Charge transfer and symmetry reduction at the CuPc/Ag(110) interface studied by photoemission tomography

Charge transfer and symmetry reduction at the CuPc/Ag(110) interface studied by photoemission tomography

Structural and Electronic Properties of Columnar Supramolecular Assemblies Formed from Ionic Metal-Free Phthalocyanine on Au(111)

N , N ′ -dimethylperylene-3,4,9,10-bis(dicarboximide) on alkali halide (001) surfaces

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