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O: Fachverband Oberflächenphysik
O 6: Organic Molecules on Inorganic Substrates I: Electronic, Optical and other Properties
O 6.7: Vortrag
Montag, 16. März 2020, 12:15–12:30, REC C 213
excited states dynamics of unsubstituted terrylene, a text book molecule — •Boubacar Tanda Bonkano1, Kobin Björn2, Sergey Kovalenko2, Stefan Hecht2, and Julia Stähler1 — 1Fritz-Haber Institute of the MPG, Berlin — 2Institut für Chemie, Humboldt Universität zu Berlin
In hybrid solar cells, the separation of the electron-hole pairs after photogeneration is a key aspect of their functionality. This requires, in hybrid inorganic/organic systems, the use of molecules that have excited states with sufficiently long lifetime to allow charge separation. In order to investigate terrylene molecules, we performed two types of time-resolved spectroscopy, time-correlated single photon counting (TCSPC) and broadband transient absorption (TA) using a white light continuum probe. The steady state absorption and emission of terrylene molecules in solution show mirrored lineshapes displaying a clear vibronic progression. Terrylene molecules have their maximum absorption and emission lines at 560 nm (2.21 eV) and 570 nm (2.17 eV) respectively. Both TCSPC and TA consistently show a decay of 3.7 ns for the excited state S1. Our results demonstrate that terrylene molecules have long-lived excited states, and, therefore could facilitate charge separation process. First measurements of thin terrylene films indicate a significant change of absorption properties, possibly resulting from H-aggregate formation.