Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 14: Organic photovoltaics and electronics - mostly cell design (with DS)
HL 14.3: Talk
Monday, March 16, 2015, 15:30–15:45, EW 202
Investigation of semiconducting polymers with thermally cleavable side chains for application in multilayer devices II: Spectroscopy — •Sabina Hillebrandt1,5, Janusz Schinke2,5, Torben Adermann3, Eric Mankel4,5, Robert Lovrincic2,5, Manuel Hamburger3,5, Tobias Glaser1,5, Wolfram Jaegermann4, Wolfgang Kowalsky2,5, and Annemarie Pucci1,5 — 1Kirchhoff-Institut für Physik, Universität heidelberg — 2Institut für Hochfrequenztechnik, Technische Universität Braunschweig — 3Organisch-Chemisches Institut, Universität Heidelberg — 4Institut für Materialwissenschaften, Technische Universität Darmstadt — 5Innovationlab GmbH, Heidelberg
Conjugated polymers are a promising material class for solution processed organic electronic devices. A major challenge in solution processing of multi-layer devices is the limited number of options regarding orthogonal solvents. Therefore solubility alteration of the functional layers is crucial for facilitating device fabrication. In this talk the removal of side-chains of novel naphthalene tetracarboxydiimide based semiconducting polymers by thermal treatment is analyzed by infrared transmission spectroscopy, photoelectron spectroscopy and charge transport characteristics in organic field effect transistors. Side chain residuals in the films are correlated to temperature and duration of the thermal treatment. Solvent stability is tested by washing the films after thermal treatment. Our findings show that although side chains can be removed completely after washing the thermally treated films, the charge transport strongly depends on the parameters used for this treatment.