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O: Fachverband Oberflächenphysik
O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces
O 36.25: Poster
Tuesday, March 19, 2024, 18:00–20:00, Poster C
Singlet fission and triplet dynamics in pentacene embedded in a surface-anchored metal-organic framework — •Martin Richter1, Zhiyun Xu2, Philipp Ludwig3, Pavel Kolesnichenko1, Uwe Bunz3, Christof Wöll2, and Petra Tegeder1 — 1Physikalisch-Chemisches Institut, Universität Heidelberg — 2Institut für Funktionelle Grenzflächen, Karlsruher Institut für Technologie — 3Organisch-Chemisches Institut, Universität Heidelberg
It has been observed, that the rate of SF and the lifetime of the generated triplets strongly depend on the molecular arrangement.[1]
Here, a cofacial orientation of pentacene molecules is achieved by embedding them in a surface anchored metal-organic framework (SURMOF). Transient absorption spectroscopy has been used to analyze the ultrafast dynamics as well as long lived states after photoexcitation. The observed difference absorption spectra indicate, that after the initial excitation a singlet excited state generates a correlated triplet pair within a few picoseconds that retains singlet character. Subsequent dynamics show the formation of a long-lived species (40us) with triplet character. This exceeds by far the observed lifetime of triplets generated in pentacene thin films (10ns) and may enhance triplet harvesting capabilities in photovoltaic devices.[2]
1. Lubert-Perquel, Nat Commun. 2018, 9, 4222
2. Poletayev, A.D., Adv. Mater. 2014, 26, 919-924
Keywords: SURMOF; Transient Absorption; Pentacene; Singlet Fission