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DS: Fachverband Dünne Schichten
DS 58: Organic Electronics and Photovoltaics III
(Joint session of CPP, DS, HL and O, organized by CPP)
DS 58.9: Vortrag
Freitag, 11. März 2016, 11:45–12:00, H40
Charge-Transfer - Solvent Interaction Predefines Doping Efficiency in p-Doped P3HT-Films — •Lars Müller1,2,6, Diana Nanova1,2,6, Tobias Glaser2,6, Sebastian Beck2,6, Annemarie Pucci2,6, Anne K. Kast3,6, Rasmus R. Schröder3,4,6, Eric Mankel5,6, Robert Lovrincic1,6, and Wolfgang Kowalsky1,2,6 — 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.