SKM 2023 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.23: Poster

Monday, March 27, 2023, 13:00–15:00, P2/EG

Optical properties of the organic semiconductor Dimethylanthradithiophene (DMADT) — •Anncharlott Kusber and Martin Knupfer — IFW Dresden, Helmholtz Straße 20, D-01069 Dresden, Germany

This work presents an analysis of the optical properties of anti- and syn-dimethylanthradithiophene. We have produced 120 nm thick thin films by physical vapour deposition. Using optical spectroscopy, we were able to characterize the films in the visible range. Davydov splitting, due to the existence of two molecules in the unit cell, was observed. Besides that, we measured the exciton dispersion by using electron energy-loss spectroscopy. There we found a positive dispersion of the lowest lying excitation. Comparing the measured values and the calculated coupling strengths, we came to the conclusion that both materials are very weak J-aggregates and that charge transfer exciton coupling is the dominant process and determines the delocalization of the lowest lying excitations.