Berlin 2024 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 39: Focus Session: Ultrafast Processes in Organic Semiconductors and Perovskites I (joint session O/CPP)
CPP 39.5: Vortrag
Donnerstag, 21. März 2024, 12:00–12:15, MA 004
Charge separation in a porphyrin-based metal organic framework incorporating C60 fullerenes — •Martin Richter1, Xiaojing Liu2, Pavel Kolesnichenko1, Christof Wöll2, and Petra Tegeder1 — 1Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 253/229, 69120 Heidelberg, Germany — 2Institut für Funktionelle Grenzflächen, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
Porphyrin-based materials are attracting great interest due to their wide range of applications. They are often embedded into metal organic frameworks (MOF) to manipulate and investigate the relations between function and structure. Together with an electron acceptor charge separation can be achieved being beneficial for uses e.g. in solar cells or photocatalysis. Experiments on ZnTPP (Zinc 5,15-bis-(3,4,5-trimethoxyphenyl)-10,20-bis-(4-carboxyphenyl)) in a surface anchored MOF (SURMOF) loaded with fullerene C60 inside the pores have shown that photoexcitation increases the conductivity by up to two orders of magnitude.[1] Here, we investigate excited states dynamics after optical excitation with transient absorption spectroscopy on the femto- to nanosecond scale. Charge separated states can be identified, which have a lifetime of a few hundred picoseconds. The charge separation occurs after excitation of both the Soret band and the Q band.
1. X. Liu, Angew. Chem. Int. Ed. 2019, 58, 9590.
Keywords: SURMOF; Porphyrin; Transient Absorption; Charge separation; Ultrafast