Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 62: Organic Electronics and Photovoltaics III (joint session CPP/DS/HL/O, organized by CPP)

CPP 62.9: Vortrag

Freitag, 11. März 2016, 11:45–12:00, H40

Charge-Transfer - Solvent Interaction Predefines Doping Efficiency in p-Doped P3HT-Films — •Lars Müller^1,2,6, Diana Nanova^1,2,6, Tobias Glaser^2,6, Sebastian Beck^2,6, Annemarie Pucci^2,6, Anne K. Kast^3,6, Rasmus R. Schröder^3,4,6, Eric Mankel^5,6, Robert Lovrincic^1,6, and Wolfgang Kowalsky^1,2,6 — ¹IHF, TU Braunschweig — ²KIP, Heidelberg University — ³BioQuant, Heidelberg University — ⁴CAM, Heidelberg University — ⁵Surface Science Division, TU Darmstadt — ⁶InnovationLab, Heidelberg

Doping of organic semiconductors is a prerequisite for the production of efficient devices such as organic light emitting diodes. Numerous recent publications reveal new insights on doping mechanisms and charge transfer, emphasizing the need for further investigations, especially on polymer systems. In this work, we study p-type doping of poly(3-hexylthiophene) (P3HT) with 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), spin coated from the solvents chlorobenzene or chloroform. We find that films prepared from chloroform show a higher conductivity than films prepared from chlorobenzene. To clarify this unintuitive behavior, electron diffraction is used to reveal differences in the structural order within films from the two solvents. Additionally, UV-Vis and infrared spectroscopy help to expand the view to electronic properties such as vibrational or polaronic absorptions. It turns out that structural order and electronic properties in doped films are predefined by the interaction of the solvent with charge-transfer complexes already in solution.