Spectroscopic ellipsometry and reflection anisotropy spectroscopy of lutetium diphthalocyanine films on silicon

Seidel, Falko; Fronk, Michael; Himcinschi, Cameliu; Chiş, Vasile; Zahn, Dietrich R. T.

doi:10.1002/pssc.200982464

Cited by 6 publications

(7 citation statements)

References 7 publications

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“…24 This approach was first used for a double-decker phthalocyanine by F. Seidel et al 34 The symmetry of the double-decker phthalocyanine molecules is reduced compared to the conventional phthalocyanines. 24 This approach was first used for a double-decker phthalocyanine by F. Seidel et al 34 The symmetry of the double-decker phthalocyanine molecules is reduced compared to the conventional phthalocyanines.…”

Section: Molecular Orientation Of Tbpc 2 On Different Substratesmentioning

confidence: 99%

Tuning the magneto-optical response of TbPc₂ single molecule magnets by the choice of the substrate

et al. 2015

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† Electronic supplementary information (ESI) available: Maldi-ToF spectrum of [TbPc2] 0 (Fig. S1). UV/vis/nIR spectrum of [TbPc2] 0 (Fig. S2). MOKE spectrum of a blank Si substrate (Fig. S3). VASE spectra of one sample and the model fit (Fig. S4), and in-plane components (Fig. S5), as well as the out-of-plane components of the dielectric tensor (Fig. S6) of the TbPc2 films grown on SiO2/Si. Complex refractive index of TbPc2/PTCDA (Fig. S7). Complex refractive index of TbPc2/Co (Fig. S8). Ligand field parameters of TbPc2 powder and film (Table S1).In this work, we investigated the magneto-optical response of thin films of TbPc2 on substrates which are relevant for (spin) organic field effect transistors (SiO2) or vertical spin valves (Co) in order to explore the possibility of implementing TbPc2 in magneto-electronic devices, the functionality of which includes optical reading. The optical and magneto-optical properties of TbPc2 thin films prepared by organic molecular beam deposition (OMBD) on silicon substrates covered with native oxide were investigated by variable angle spectroscopic ellipsometry (VASE) and magneto-optical Kerr effect (MOKE) spectroscopy at room temperature. The magneto-optical activity of the TbPc2 films can be significantly enhanced by one to two orders of magnitude when changing the molecular orientation (from nearly standing molecules on SiO2/Si substrates to nearly lying molecules on perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) templated SiO2/Si substrates) or by using metallic ferromagnetic substrates (Co).

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Section: Molecular Orientation Of Tbpc 2 On Different Substratesmentioning

confidence: 99%

Tuning the magneto-optical response of TbPc₂ single molecule magnets by the choice of the substrate

et al. 2015

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“…11,12 On most metallic surfaces, Pc molecules are known to lie flat, whereas the molecular architectures are various on semiconducting substrates. Pc molecules are found lying flat on InSb(001) surface, 9 whereas they are inclined on Si(001).…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of electronic structure of lutetium bi-phthalocyanine

Bidermane

Lüder

Boudet

et al. 2013

The Journal of Chemical Physics

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Using Near Edge X-Ray Absorption Fine Structure (NEXAFS) Spectroscopy, the thickness dependent formation of Lutetium Phthalocyanine (LuPc 2 ) films on a stepped passivated Si(100)2×1 reconstructed surface was studied. Density functional theory (DFT) calculations were employed to gain detailed insights into the electronic structure. Photoelectron spectroscopy measurements have not revealed any noticeable interaction of LuPc 2 with the H-passivated Si surface. The presented study can be considered to give a comprehensive description of the LuPc 2 molecular electronic structure. The DFT calculations reveal the interaction of the two molecular rings with each other and with the metallic center forming new kinds of orbitals in between the phthalocyanine rings, which allows to better understand the experimentally obtained NEXAFS results. © 2013 AIP Publishing LLC.

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“…The model is not taking into account the interaction between the molecules in a molecular crystal since it is based on single molecules. Furthermore, it was assumed that the transition dipoles within the molecular plane are equal [3], and that there is no coupling between the dipole elements. The more general form of Eq.…”

Section: B Cupc On H-passivated Silicon Substrates Compared To Si-sumentioning

confidence: 99%

Molecular Orientation of Copper Phthalocyanine Molecules on Crystalline and Amorphous Silicon Substrates

Breyer

Lehmann

Zahn

2012

e-J. Surf. Sci. Nanotechnol.

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The orientation of semiconducting organic molecules, like in copper phthalocyanine (CuPc) thin films, is of importance for the electrical properties of organic/inorganic hybrid devices. Amorphous silicon films (a-Si), deposited onto crystalline Si-wafers by DC-pulsed magnetron sputtering, were utilised as substrates for the investigation. Crystalline silicon (111), with and without native oxide, was used as reference. Thin films of CuPc were fabricated using Organic Molecular Beam Deposition (OMBD) under high vacuum conditions (3 × 10 −7 mbar). For one group of the substrates the native SiO2 layer was removed by hydrofluoric acid, and the surface was Hydrogen passivated. The average molecular tilting angle of CuPc molecules on both substrates was calculated from the anisotropic absorption coefficients as determined by ex situ Variable Angle Spectroscopic Ellipsometry (VASE). Significant differences in the molecular orientation depending on the substrate and its preparation are observed. For H-passivated silicon substrates it is found that the tilting angle changes from (66 ± 5)• to (83 ± 9)• when going from crystalline to amorphous substrates. Furthermore, CuPc molecules grew on silicon with native oxide in a "standing up" configuration at an angle of 90• relative to the substrate. Isotropic layers of CuPc were produced at substrate temperatures of around −155• C.

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Spectroscopic ellipsometry and reflection anisotropy spectroscopy of lutetium diphthalocyanine films on silicon

Cited by 6 publications

References 7 publications

Tuning the magneto-optical response of TbPc₂ single molecule magnets by the choice of the substrate

Tuning the magneto-optical response of TbPc₂ single molecule magnets by the choice of the substrate

Experimental and theoretical study of electronic structure of lutetium bi-phthalocyanine

Molecular Orientation of Copper Phthalocyanine Molecules on Crystalline and Amorphous Silicon Substrates

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Spectroscopic ellipsometry and reflection anisotropy spectroscopy of lutetium diphthalocyanine films on silicon

Cited by 6 publications

References 7 publications

Tuning the magneto-optical response of TbPc2 single molecule magnets by the choice of the substrate

Tuning the magneto-optical response of TbPc2 single molecule magnets by the choice of the substrate

Experimental and theoretical study of electronic structure of lutetium bi-phthalocyanine

Molecular Orientation of Copper Phthalocyanine Molecules on Crystalline and Amorphous Silicon Substrates

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Tuning the magneto-optical response of TbPc₂ single molecule magnets by the choice of the substrate

Tuning the magneto-optical response of TbPc₂ single molecule magnets by the choice of the substrate