Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 31: Electrical, Dielectrical and Optical Properties of Thin Films (joint session CPP/KFM)

KFM 31.4: Vortrag

Freitag, 9. September 2022, 12:15–12:30, H38

Exciton dynamics in surface-mounted metal-organic frameworks: A femtosecond transient absorption study — •Vipilan Sivanesan1, Martin Richter1, Debkumar Rana1, Ritesh Haldar2, Christoph Wöll2, and Petra Tegeder11Physikalisch-Chemisches Institut, Universität Heidelberg, Germany — 2Institute of Functional Interfaces, Karlsruhe Institute of Technology, Germany

For the optimization of organic optoelectronic devices, it is important to understand the ultrafast electronically excited state dynamics in organic semiconductors after optical excitation. For instance, different molecular packing and relative orientations of the optically active chromophores can affect the excitonic coupling strength. This can be studied in crystalline molecular assemblies by integrating these chromophores into surface-mounted metal-organic frameworks (SURMOFs) as organic linkers. Varying the side-groups of the molecules enables to engineer the crystal structure to tune the excitonic coupling. To analyse the influence of this crystal engineering on the ultrafast dynamics we investigated thin films of chromophore functionalized Zn-SURMOF by means of femtosecond transient absorption.

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