Dresden 2020 – wissenschaftliches Programm
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CPP 38.4: Vortrag
Dienstag, 17. März 2020, 10:15–10:30, ZEU 255
Bimodal Electronic Interactions in Molecular-doped Conducting Polymers — •Vandana Tiwari1,2, Ajay Jha1, Hong-Guang Duan1, Michael Thorwart3, and R. J. Dwayne Miller1,4 — 1MPSD, Hamburg — 2Department of Chemistry, University of Hamburg (UH), Germany — 3I. Institut für Theoretische Physik, UH, Germany — 4University of Toronto, Canada
Doping is an extremely important process where intentional insertion of impurities in semiconductors controls their electronic properties. Unraveling the favorable electronic interaction between dopant and polymer is the key to the success of molecular doping in organic semiconductors. Here we use two-dimensional electronic spectroscopy to explore the electronic dynamics of F4TCNQ-doped conducting polymers, P3HT and PBTTT in precursor solution mixtures. The electronic interactions among the ion-pairs formed in precursor solutions are captured in the form of off-diagonal peaks connecting the electronic states of polymer and dopant radicals. This electronic interaction represents a well resolved electrostatically bound state, as opposed to a random distribution of ions. We have theoretically modeled our system to simulate the experimental data and achieve a quantitative picture of the Coulombic interaction between cation and anion radicals in solution. Our study reveals the heterogeneous electronic interactions that possibly serve as a seed for the structures in the spin-casted films. This new insight will help pave the way towards rational tailoring of the electronic interactions to improve doping efficiencies in processed organic semiconductor thin films.