Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 22: Organic Electronics and Photovoltaics II: Doping
HL 22.4: Vortrag
Montag, 20. März 2017, 16:00–16:15, ZEU 260
Conical Intersection Dynamics of F4TCNQ Anion Radical doped Conducting Polymer Observed by 2D Electronic Spectroscopy — Ajay Jha1, Hong-Guang Duan1,2,3, •Vandana Tiwari1, Michael Thorwart2,3, and R. J. Dwayne Miller1,3,4 — 1MPI-Structure & Dynamics of Matter, Hamburg, Germany — 2Universität Hamburg, Germany — 3CUI Hamburg, Germany — 4University of Toronto, Canada
Quinones are well celebrated electron acceptors which are even employed by nature for their impressive ability to retain electrons e.g. ubiquinone and plastoquinone. Quinone derivatives like tetrafluoro-tetracyano-quinodimethane (F4TCNQ) are popularly used as a p-type dopant to obtain high conducting polymer blend. To achieve higher conductivity, there has been a constant empirical effort to obtain different derivatives of quinones. In order to develop a molecular basis for rational tailoring F4TCNQ unit, understanding the electronic structure and relaxation dynamics of the TCNQ doped within a polymer framework is paramount. We have employed two-dimensional electronic spectroscopy to probe the coherent dynamics of F4TCNQ with the semiconducting polymer forming a charge transfer complex. We captured an ultrafast decay of F4TCNQ- mediated by conical intersection which is in agreement with the photoelectron spectroscopic studies in gas-phase. Additionally, we also observe that electronic transitions in F4TCNQ- are strongly coupled to polymer cation electronic structure. Our results open up new perspectives for tailoring intermolecular interactions to obtain high electrical conductivities.