Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Molecular Electronics and Excited State Properties

CPP 3.1: Hauptvortrag

Montag, 1. April 2019, 09:30–10:00, H13

Tailoring the Excited State Energy Landscape in Supramolecular Nanostructures — •Richard Hildner — Soft Matter Spectroscopy, University of Bayreuth, Bayreuth, Germany — Zernike Institute for Advanced Materials, University of Groningen, Groningen, Netherlands

Application of organic macromolecules in molecular electronics and nanophotonics requires their well-defined assembly into nano- and mesoscale structures to allow for efficient energy and/or charge transport. Here we demonstrate robust self-assembly of so-called carbonyl-bridged triarylamines (CBT) into micrometre-long objects driven by specific supramolecular motifs. Depending on the solvent we are able to prepare isolated supramolecular nanofibres, in which the CBT molecules are cofacially stacked (H-aggregate), or to prepare well-defined bundles of such nanofibres. Combining optical spectroscopy with electron microscopy and numerical modelling, we find that isolated nanofibres possess a high degree of structural order. In turn, this results in a high degree of electronic order in the electronically excited states. In contrast, in nanofibre bundles the structural and electronic order is significantly less pronounced. We show that this difference in order has substantial impact on the transport of excitation energy: While isolated nanofibres exhibit long-range energy transport of several micrometres, in nanofibre bundles this is not the case. Hence, the solvent allows to tune the excited state energy landscape of nanofibres, which in turn allows to control the transport characteristics of excitation energy along nanofibres.