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Photophysics of charge transfer complexes formed by tetracene and strong acceptors

DOI: 10.1021/acs.jpcc.0c10815 DOI Help

Authors: Christoph P. Theurer (Universität Tübingen) , Ana M. Valencia (Carl von Ossietzky Universität Oldenburg,; Humboldt-Universität zu Berlin) , Julian Hausch (Universität Tübingen) , Clemens Zeiser (Universität Tübingen) , Vipilan Sivanesan (Universität Heidelberg) , Caterina Cocchi (Carl von Ossietzky Universität Oldenburg,) , Petra Tegeder (Universität Heidelberg) , Katharina Broch (Universität Tübingen)
Co-authored by industrial partner: No

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

State: Published (Approved)
Published: March 2021
Diamond Proposal Number(s): 21899

Abstract: Organic charge transfer complexes (CTCs) with near-infrared absorption received growing interest in the past years, but the details of their photophysics, especially in thin films, remain largely unknown. We combined experimental and computational methods to thoroughly investigate and compare CTCs formed by tetracene with 2,2′-(perfluoronaphthalene-2,6-diylidene)dimalononitrile and 2,3,5,6-tetrafluoro-7,7,8,8,-tetracyanoquinodimethane, respectively. Using ultrafast transient absorption spectroscopy, the photophysics of these small bandgap CTCs was revealed, which is dominated by a sub-picosecond relaxation of the excitons back to the ground state. In equimolar blends, tetracene singlet fission is suppressed while in blends with excess of tetracene reduced lifetimes of tetracene, singlet and triplet excitons were found.

Subject Areas: Chemistry, Physics

Instruments: I07-Surface & interface diffraction

Added On: 14/03/2021 21:35

Discipline Tags:

Surfaces Physics Physical Chemistry Chemistry interfaces and thin films

Technical Tags:

Diffraction Grazing Incidence X-ray Diffraction (GIXD)