Regensburg 2025 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Organic Electronics and Photovoltaics II

CPP 22.5: Talk

Tuesday, March 18, 2025, 15:00–15:15, H38

Regulated Growth of Benzoperylene-TCNQ Charge-Transfer Complex Crystalline Networks — •Kirill Gubanov, Yana Reva, Stevie Furxhiu, Fabian Streller, Yifan Bo, Phillip Greißel, Dirk M. Guldi, and Rainer H. Fink — Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen Nürnberg, Egerlandstraße 3, 91058 Erlangen, Germany

Highly ordered luminescent organic micro- and nano-crystals of charge-transfer complexes (CTC) are generating a considerable interest due to their prospective applications in miniaturized and multifunctional optoelectronics. We propose a strategy of controlled crystallization growth of Benzoperylene (BP)-TCNQ-CTC nanorods network. As a result of the distinct polarity-based solubility of BP and TCNQ, 2D microsheets of BP of tunable sizes can be used as templates for the CTC nanorod meshes growth in solution. The optical and electronic properties of the respective CTC were additionally investigated. Emission spectroscopy revealed a significant quenching of the BP strong fluorescence upon CTC formation: electron excitation in BP leads to a charge transfer to a non-emissive TCNQ and to non-radiative relaxation. Using NEXAFS micro-spectroscopy, we examined the electronic structure and a temperature-dependent band gap modification. Thus, collective insights into the BP-TCNQ CTC properties provide valuable information for material optimization for future applications in optoelectronic devices. The research is funded by the BMBF (contract 05K19WE2) and SolTech initiative.

Keywords: Organic Electronics; Charge-Transfer Complex; X-ray Microspectroscopy; Solution-Processed; Luminescent Crystals