Tetra-t-butyl magnesium phthalocyanine on gold: Electronic structure and molecular orientation

Biswas, Indro; Peisert, Heiko; Schwieger, T.; Dini, Danilo; Hanack, Michael; Knupfer, M.; Schmidt, Thomas; Chassé, Thomas

doi:10.1063/1.1844300

Cited by 31 publications

(20 citation statements)

References 41 publications

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“…The values obtained are very similar to those of [16]. While in this paper optical spectroscopies were used to determine the molecular orientation, other techniques like near edge X-ray absorption fine structure (NEXAFS) can be used for precise analysis of the phthalocyanine molecule orientation [17,18]. The anisotropic dielectric functions of CuPc and PTCDA are shown in Fig.…”

Section: Single Layersmentioning

confidence: 53%

Comparative study of dielectric functions of complex organic heterostructures

Gordan¹,

Hermann²,

Friedrich³

et al. 2005

Physica Status Solidi (b)

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Organic/organic heterostructures and mixed layers were prepared by organic molecular beam deposition (OMBD) in high vacuum (HV) on hydrogen passivated (111) oriented silicon. The substrates were kept at room temperature during the deposition. The organic superstructures consisting in alternative layers of tris--diamine (α-NPD) and 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA)/copper phthalocyanine (CuPc) were investigated by means of spectroscopic ellipsometry in the 0.73 -5 eV spectral range. Additionally reflection infra-red (IR) measurements were performed using p-and s-polarisation.Taking into account the dielectric function of the single layers the optical response of the Alq 3 /α-NPD superstructure can be modeled assuming sharp interfaces. However, for the PTCDA/CuPc superstructure the optical response requires a more sophisticated approach than simply superimposing the responses of the individual layers. The deviation between simulated and experimental data is assigned to the molecular interaction at the interfaces between PTCDA and CuPc. This can affect the molecular orientation and the optical properties.

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Section: Single Layersmentioning

confidence: 53%

Comparative study of dielectric functions of complex organic heterostructures

Gordan¹,

Hermann²,

Friedrich³

et al. 2005

Physica Status Solidi (b)

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“…The pattern of substitution may significantly affect the orientation of the Pc molecules and/or the electronic properties of the corresponding interface, e.g. due to altered moleculemolecule interactions [25,26,35]. The complexity of such interactions makes it necessary to perform experiments on model systems such as evaporation of various molecules on different surfaces whereby a more detailed understanding of the interactions and processes can be obtained.…”

Section: A) Molecular Rearrangement B) Buried Interfacial Layermentioning

confidence: 99%

“…1), for details see Refs. [25,26,35]. (t-but) 4 PcMg is a molecule with relatively small, but sterically demanding substituents, that may therefore affect the strength of the intermolecular π−π interactions compared to unsubstituted phthalocyanines.…”

Section: The Influence Of Chemical Substitutions On the Molecular Orimentioning

confidence: 99%

Orientation and electronic properties of phthalocyanines on polycrystalline substrates

Peisert

Biswas

Knupfer

et al. 2009

Physica Status Solidi (b)

115

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We review the molecular orientation of phthalocyanines as representatives of flat, π‐conjugated molecules on different polycrystalline substrates. Thin films with a thickness of ∼10–50 nm are often highly ordered on several substrates. The molecular orientation, however, can be radically different for single crystalline model substrates and for relatively ill defined polycrystalline substrates. Moreover, it is important to distinguish between the growth of the first organic layer(s) at the substrate surface and the growth in films of a thickness of several nanometers: Differently oriented, buried interfacial layers of few monolayers were observed in particular for polycrystalline substrates. The growth mode is discussed in terms of different molecule–molecule and molecule–substrate interactions. Consequences for our understanding of the behavior of such films in devices are considered in context with electronic interface properties. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…This makes a detailed understanding of the thin film properties highly desirable. Most studies so far have addressed the structural aspects of the molecular arrangement of phthalocyanines in the condensed thin film phase using UPS, XPS or NEXAFS [10][11][12][13]. Valuable additional information in particular concerning the optical properties can be gained from luminescence spectroscopy.…”

Section: Introductionmentioning

confidence: 99%