Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 77: Organic Electronics and Photovoltaics - Transport and Doping
CPP 77.9: Vortrag
Freitag, 16. März 2018, 12:00–12:15, C 243
Direct evidence of strong detrimental electronic interactions in solution processed doped organic semiconductors — •Ajay Jha1, Hong-Guang Duan1,2,3, Vandana Tiwari1, Michael Thorwart2,3, and R. J. Dwayne Miller1,3,4 — 1MPSD, Hamburg, Germany — 2I. Institut für Theoretische Physik, UH, Germany — 3CUI, Hamburg, Germany — 4University of Tornoto, Canada
Understanding the inherent electronic structure the ion-pairs is essential to formulate a rational basis for charge mobilities in doped organic electronic circuits. Here we apply two-dimensional electronic spectroscopy to investigate the electronic dynamics of ion-pair in a solution of F4TCNQ-doped conducting polymer, PBTTT as a model system. The Coulombic interaction between cation and anion results in strong electronic coupling within the PBTTT+F4TCNQ- ion-pair which is manifested by the well-resolved off-diagonal peaks in 2D spectra envisaging the electronic connectivity among the ions. A theoretical model which simulates the experimental data reveals that the electronic coupling strength of 250 cm-1 with an intermolecular distance of 4.5 Å between the ions. Our experiments in combination with the theoretical modeling capture the molecular details of the ion-pair which should pave the way towards rational tailoring of the ion-pairs in solution.