Universität zu Köln

Zablocki, Jennifer, Schulz, Matthias, Schnakenburg, Gregor, Beverina, Luca, Warzanowski, Philipp, Revelli, Alessandro, Grueninger, Markus, Balzer, Frank ORCID: 0000-0002-6228-6839, Meerholz, Klaus ORCID: 0000-0001-7450-4672, Luetzen, Arne and Schiek, Manuela (2020). Structure and Dielectric Properties of Anisotropic n-Alkyl Anilino Squaraine Thin Films. J. Phys. Chem. C, 124 (41). S. 22721 - 22733. WASHINGTON: AMER CHEMICAL SOC. ISSN 1932-7455

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Abstract

Solution-processed and thermally annealed thin films from a series of n-alkyl terminated anilino squaraines are systematically investigated regarding their structural and optical properties by means of X-ray diffraction (XRD) and spectroscopic ellipsometry (SE). Their characteristic intense double-hump-shaped absorbance spectra consisting of coupled H-aggregate and intermolecular charge transfer (ICT) resonance bands make them appealing for fundamental light-matter interaction studies, and their environmental sustainability invites for consumer optoelectronic applications. Now, the single-crystal structure of the n-pentyl anilino squaraine (nPSQ) provides a missing link to identify potential odd-even effects with respect to the terminal alkyl chain for bulk crystals. While all single crystals adopt a triclinic unit cell with biaxial dielectric properties, the thin films condense into effectively uniaxial anisotropic thin films. Here, the inherently low sensitivity to the out-of-plane complex refractive index of SE in reflection is reasonably compensated by adding transmission SE and transmission intensity data. With that, a general picture of the structural and dielectric properties of n-alkyl anilino squaraine thin films is launched, revealing that the terminal alkyl chain length affects the structural and optical properties in a twofold way: we observe a steady change which is superimposed by an anisotropic odd-even effect.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zablocki, Jennifer UNSPECIFIED UNSPECIFIED UNSPECIFIED Schulz, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Schnakenburg, Gregor UNSPECIFIED UNSPECIFIED UNSPECIFIED Beverina, Luca UNSPECIFIED UNSPECIFIED UNSPECIFIED Warzanowski, Philipp UNSPECIFIED UNSPECIFIED UNSPECIFIED Revelli, Alessandro UNSPECIFIED UNSPECIFIED UNSPECIFIED Grueninger, Markus UNSPECIFIED UNSPECIFIED UNSPECIFIED Balzer, Frank UNSPECIFIED orcid.org/0000-0002-6228-6839 UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED Luetzen, Arne UNSPECIFIED UNSPECIFIED UNSPECIFIED Schiek, Manuela UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-314807
DOI:	10.1021/acs.jpcc.0c07498
Journal or Publication Title:	J. Phys. Chem. C
Volume:	124
Number:	41
Page Range:	S. 22721 - 22733
Date:	2020
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1932-7455
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SIDE-CHAIN; DYES; SERIES; ABSORPTION Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/31480