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Deposition-dependent morphology and infrared vibrational spectra of brominated tetraazaperopyrene layers

A detailed infrared spectroscopic characterization - supported by atomic force microscopy - of core brominated tetraazaperopyrene (TAPP-Br) layers in terms of molecular orientation and stability against electron irradiation is presented. The anisotropy and the average molecular orientation of TAPP-B...

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Main Authors: Tzschoppe, Michael (Author) , Huck, Christian (Author) , Günther, Benjamin (Author) , Matthiesen, Maik (Author) , Rohnacher, Valentina (Author) , Gade, Lutz H. (Author) , Zaumseil, Jana (Author) , Pucci, Annemarie (Author)
Format: Article (Journal)
Language:English
Published: 2020
In: The journal of physical chemistry. C, Energy, materials, and catalysis
Year: 2020, Volume: 124, Issue: 1, Pages: 769-779
ISSN:1932-7455
DOI:10.1021/acs.jpcc.9b10155
Online Access:Verlag, Volltext: https://doi.org/10.1021/acs.jpcc.9b10155
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Author Notes:Michael Tzschoppe, Christian Huck, Benjamin Günther, Maik Matthiesen, Constantin Ulrich, Jan Niklas Rose, Andrey Butkevich, Valentina Rohnacher, Lutz H. Gade, Jana Zaumseil, and Annemarie Pucci
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Summary:A detailed infrared spectroscopic characterization - supported by atomic force microscopy - of core brominated tetraazaperopyrene (TAPP-Br) layers in terms of molecular orientation and stability against electron irradiation is presented. The anisotropy and the average molecular orientation of TAPP-Br molecules in optoelectronic device-relevant thin films (with ca. 20 nm thickness), grown by thermal evaporation under ultrahigh vacuum conditions and in a zone-cast sample, were established. To this end, the tensor components of the dielectric function were determined on the basis of spectra of a pellet sample and of a variety of polarization-dependent spectra of layers. Supported by density functional theory, the experimentally derived tensor components were related to dipoles of selected vibrational modes in the anisotropic TAPP-Br molecule and so to the average molecular orientation in the polycrystalline layers. Additionally, electron beam damage for energies ranging from ten to hundreds of electron volts was studied in order to obtain the threshold energy below which scanning electron microscopy can be carried out in a nondestructive way.
Item Description:Published online 13 December 2019
Gesehen am 14.02.2020
Physical Description:Online Resource
ISSN:1932-7455
DOI:10.1021/acs.jpcc.9b10155

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