Molecular orientation in diindenoperylene thin films deposited on polycrystalline gold

Casu, Maria Benedetta; Biswas, Indro; Schuster, Britt‐Elfriede; Nagel, Mathias; Nagel, Peter; Schuppler, S.; Chassé, Thomas

doi:10.1063/1.2957474

Cited by 26 publications

(42 citation statements)

References 21 publications

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“…[15][16][17] Further work needs to be done to clarify this point, also including the possible influence of the substrate morphology. 42,43 AFM images monitor the film morphology dependence on the preparation parameters. In Fig.…”

Section: Discussionmentioning

confidence: 99%

Influence of the preparation conditions on the morphology of perylene thin films on Si(111) and Si(100)

Casu

Schmitt

et al. 2008

The Journal of Chemical Physics

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Thin films of perylene on Si(111) and Si(100) substrates have been investigated using a variety of experimental techniques. We find that the structural and morphological properties as well as the growth modes strongly depend on the preparation parameters. In general, we observe the existence of a relatively weak coupling between perylene and the two single crystal substrates. However, under special preparation conditions, it is possible to obtain a multilayer phase on the Si(111) substrate that is characterized by flat-lying, parallel-oriented molecules, and strong coupling with the substrate in the first layer. This phase has different structural, electronic, and intermolecular bonding properties as compared to the known crystalline phases. On Si(100), by varying the deposition rate between 0.1 and 10 nm/min, it is possible to observe a transition from island growth mode, with large and isolated crystallites, to homogeneous film growth. These findings contribute to the basic knowledge for film engineering. Thus, the film morphology could be designed ranging from the growth of very large single grains suitable for a complete nanodevice to homogenous films for application in large displays.

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Section: Discussionmentioning

confidence: 99%

Influence of the preparation conditions on the morphology of perylene thin films on Si(111) and Si(100)

Casu

Schmitt

et al. 2008

The Journal of Chemical Physics

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“…We note that recently a change of the initial molecular orientation was also found for related systems, such as (but) 8 PcZn on the van der Waals substrate GeS(001) [26] for perfluorinated CuPcF 16 on SiO 2 and most recently for an another π-conjugated molecule, diindenoperylene on gold foil [60]. A condition for an ordered growth of standing molecules seems to be a certain degree of roughness, at least on the scale of the size of the molecule, otherwise an initial lying adsorption geometry may be locked in -as discussed above for the unsubstituted phthalocyanines on single crystalline substrates.…”

Section: Figure 12mentioning

confidence: 92%

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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“…The former are due to transitions from C1s levels of nonequivalent carbon atoms mainly to the lowest unoccupied molecular orbital ͑LUMO͒. 23 NEXAFS is the appropriate technique to investigate the orientation of the molecules in a film. The spectral features exhibit strong polarization dependence that can be used to determine the molecular orientation from the observed dichroic behavior.…”

Section: B Morphology and Electronic Structurementioning

confidence: 99%

Photoemission electron microscopy of diindenoperylene thin films

et al. 2008

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We present the results of photoemission electron microscopy investigations of diindenoperylene thin films deposited by organic molecular-beam deposition on polycrystalline gold at room temperature. Our findings revealed the existence of a different molecular orientation, besides the already known and phases, characterized by an intermediate tilt angle. In thicker film regions, the energy of the films is minimized by a molecular arrangement that has an asymptotic tendency to the upright standing position. We have interpreted our results by using basic concepts in terms of relative strength of the substrate-molecule and moleculemolecule interactions.

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Molecular orientation in diindenoperylene thin films deposited on polycrystalline gold

Cited by 26 publications

References 21 publications

Influence of the preparation conditions on the morphology of perylene thin films on Si(111) and Si(100)

Influence of the preparation conditions on the morphology of perylene thin films on Si(111) and Si(100)

Orientation and electronic properties of phthalocyanines on polycrystalline substrates

Photoemission electron microscopy of diindenoperylene thin films

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