Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 5: Organic semiconductors I (joint session HL/CPP)

HL 5.2: Talk

Monday, March 16, 2020, 09:45–10:00, POT 112

Dibenzopentacene single crystals: growth, characterization and exciton dispersion — •Lukas Graf, Fupin Liu, Bipasha Debnath, and Martin Knupfer — IFW Dresden

Pentacene and its hydrocarbon relatives continue to attract researchers world-wide, as they promise applications due to their relatively high charge carrier mobilities and their intriguing photophysical behavior including singlet fission processes. We have studied a relatively unexplored member of this family, Dibenzopentacene (DBP).

Single crystals of DBP have been grown using the vapor phase transport method, which to the best of our knowledge are the first DBP single crystals reported so far. We have determined the DBP crystal structure using X-ray diffraction and complementary electron diffraction experiments. The electronic excitations of DBP have been investigated using electron energy-loss spectroscopy (EELS). We present results on the strongly anisotropic electronic excitations across the band gap, and in addition their momentum behavior, i.e. their dispersion. An analysis of this exciton dispersion using a simple model from the literature allowed to gain first information on the charge carrier hopping parameters in DBP.

This is supported by the DFG (KN393/25, KN293/26).