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Thin film texture and optical properties of donor:acceptor complexes. Diindenoperylene:F6TCNNQ vs Alpha-Sexithiophene:F6TCNNQ

DOI: 10.1021/acs.jpcc.8b03744 DOI Help

Authors: Giuliano Duva (University of Tübingen) , Linus Pithan (Humboldt-Universität zu Berlin; ESRF - The European Synchrotron) , Clemens Zeiser (University of Tübingen) , Berthold Reisz (University of Tübingen) , Johannes Dieterle (University of Tübingen) , Bernd Hofferberth (University of Tübingen) , Paul Beyer (Humboldt-Universität zu Berlin) , Laura Bogula (Humboldt-Universität zu Berlin; Leibniz-Institut für Kristallzüchtung) , Andreas Opitz (Humboldt-Universität zu Berlin) , Stefan Kowarik (Humboldt-Universität zu Berlin; Bundesanstalt für Materialforschung und -prüfung (BAM)) , Alexander Hinderhofer (University of Tübingen) , Alexander Gerlach (University of Tübingen) , Frank Schreiber (University of Tübingen; Center for Light-Matter Interactions)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: July 2018

Abstract: In this work two novel donor:acceptor (D:A) complexes, namely diindenoperylene(DIP):1,3,4,5,7,8-hexafluoro-tetracyanonaphthoquinodimethane(F6TCNNQ) and alpha-sexithiophene(6T):F6TCNNQ, are studied. The D:A complexes segregate in form of π-π stacked D:A co-crystals and can be observed by X-ray scattering. The different conformational degrees of freedom of the donor molecules, respectively, seem to affect the thin film crystalline texture and composition of the D:A mixtures significantly. In equimolar mixtures, for DIP:F6TCNNQ the crystallites are mostly uniaxially oriented and homogeneous, whereas for 6T:F6TCNNQ a mostly 3D (isotropic) orientation of the crystallites and coexistence of domains of pristine compounds and D:A complex, respectively, are observed. Using optical absorption spectroscopy we observe for each of the two mixed systems a set of new, strong transitions located in the near-IR range below the gap of the pristine compounds: such transitions are related to charge-transfer (CT) interactions between donor and acceptor. The optical anisotropy of domains of the D:A complexes with associated new electronic states is studied by ellipsometry. We infer that the CT-related transition dipole moment is perpendicular to the respective π-conjugated planes in the D:A complex.

Subject Areas: Materials


Instruments: I07-Surface & interface diffraction

Other Facilities: European Synchrotron Research Facility