Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 56: Focus: Exploitation of Anisotropy in Organic Semiconductors II (joint session CPP/HL)

CPP 56.2: Vortrag

Mittwoch, 18. März 2020, 10:00–10:15, ZEU 222

Influence of alkyl chain variation on co-crystal formation and molecular charge transfer — •Nadine Rußegger, Oleg Vladimirov, 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 state and in the excited state.

In this work, the charge transfer effect of weakly interacting organic semiconductor mixtures is comprehensively investigated depending on the influence of alkyl chain variation with different acceptor molecules. We choose dinaphtho[2,3-b:2’,3’-f]thieno[3,2-b]thiophene (DNTT) and diindenoperylene (DIP) as donor and several perylene-diimide derivatives with different alkyl chain length in the imide position as acceptor molecules (PDIF-CN2, PDI-C3, PDI-C5, and PDI-C8-CN2).

For a full structural overview of the resulting molecularly 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, photoluminescence as well as in-situ differential reflectance spectroscopy. For the various equimolar mixed systems of DNTT as well as DIP and different perylene-diimide derivatives charge transfer effects were estimated [1].

The results allow us to correlate the structural morphology and the charge transfer effects depending on the chain length and their configuration of the different mixed systems.

[1] V. Belova et al., J. Am. Chem. Soc., 2017, 139, 8474-8486.

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