Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Fokus: Conjugated Polymers

CPP 22.4: Topical Talk

Mittwoch, 25. März 2009, 11:00–11:30, ZEU 160

Charge transport along isolated conjugated molecular wires — •Ferdinand C. Grozema and Laurens D.A. Siebbeles — DelftChemTech, Delft University of Technology, The Netherlands

In the majority of measurements of charge transport in single molecular wires the molecule is connected to two electrodes. The results obtained from these measurements are often to a large extent determined by the molecule-electrode interface and the transport occurs by direct tunneling with the charge never being fully located on the wire. Therefore is difficult to obtain information on the mobility of charges when they are actually on the molecule. We use a unique combination of techniques that enables us to measure the mobility of charges along conjugated polymers chains that are isolated from each other by bringing them in a dilute solution. Charges are generated by irradiation with pulses of high-energy electrons and the mobility of these charges is determined by contact-less time-resolved microwave conductivity measurements. These experiments have been performed for a wide variety of different types of conjugated polymers and it was found that charge carrier mobility strongly depends on the molecular structure [1-3].

1. P. Prins, F.C. Grozema, J.M. Schins, S. Patil, U. Scherf and L.D.A. Siebbeles, Phys. Rev. Lett., 2006, 96, 146601

2. P. Prins, F.C. Grozema and L.D.A. Siebbeles, J. Phys. Chem. B, 2006, 110, 14659

3. F.C. Grozema, C. Houarner-Rassin, P. Prins, L.D.A. Siebbeles and H.L. Anderson, J. Am. Chem. Soc., 2007, 129, 13370