SKM 2021 – wissenschaftliches Programm
CPP 10: Organic Electronics and Photovoltaics, Electrical and Optical Properties (joint session CPP/KFM)
CPP 10.3: Vortrag
Donnerstag, 30. September 2021, 14:15–14:30, H3
Molecular Charge Transfer Effects on Perylene Diimide Acceptor and DNTT / DIP Donor Systems — •Nadine Rußegger, Alexander Hinderhofer, and Frank Schreiber — Institut für Angewandte Physik, Universität Tübingen, Germany
A very important and fundamental process for organic semiconductors is the charge transfer effect between electron donor and electron acceptor molecules in the ground and in the excited state.
In this work, we present a comprehensive investigation on co-crystal formation and charge transfer effects in weakly interacting organic semiconductor mixtures. We choose dinaphthothienothiophene (DNTT) and diindenoperylene (DIP) as donor and several perylene-diimide derivatives with different side chains in the imide position as acceptor molecules (PDIF-CN2, PDIC3 and PDIC8-CN2).
For a full structural overview of the resulting mixed co-crystals, the bulk-heterojunction films were evaluated by surface X-ray scattering. The optical and electronic properties of the intermolecular interactions were characterized by optical absorption and photoluminescence. For the various equimolar mixed systems of DNTT as well as DIP and the different perylene-diimide derivatives different charge transfer effects were determined .
The results allow us to correlate the structural morphology and the charge transfer effects depending on the side chains and to evaluate the energy levels of the CT complexes in the different mixed systems.
 V. Belova et al., J. Phys. Chem. C, 2020, 124, 11639-22651.