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Relation of Structure and Charge Transport in 'Single-Stack' Organic Nanowires: Nano Seminar Series

Seminar: Micro/Nano Electro Mechanical Systems | April 5 | 2-3 p.m. | 390 Hearst Memorial Mining Building

Prof. Holger Frauenrath, Ecole Polytechnique Federale de Lausanne (EPFL), Materials Lab

Berkeley Nanosciences and Nanoengineering Institute

Organic nanowires may provide insights into the fundamental processes of charge generation and transport in organic semiconductors under nanoscopic confinement.

Here, we demonstrate how a simple molecular design results in nanowires with defined lateral dimensions that comprised a single stack of tightly π–π stacked chromophores at their core. Moreover, we prepared well-defined microfibers that exhibited hierarchical structure formation with a remarkably high degree of internal order and enabled us to obtain detailed structural information on all length scales with molecular level precision.

The nanowires and microfibers nanowires showed light-induced formation of radical cations that behaved like positive polaron charge carriers. The nanofibrils were semiconducting, showed space-charge injection-limited conductivity behavior, and exhibited photo-current generation, relating their macroscopic electric properties to the spectroscopically characterized charge carriers.

Our results, thus, provide an example of a universal organic nanowire model system that successfully links molecular design, well-defined supramolecular structure formation, charge carrier generation, and finally macroscopic charge transport.