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DS: Fachverband Dünne Schichten
DS 15: Organic semiconductors: Transistors and OLEDs (Jointly with HL, CPP)
DS 15.7: Talk
Tuesday, April 1, 2014, 15:30–15:45, POT 081
IR spectroscopic investigation of charge transfer in organic semiconductors II: Interfaces — •Sebastian Beck1,2, David Gerbert1,2, Tobias Glaser1,2, and Annemarie Pucci1,2,3 — 1Kirchhoff-Institut für Physik, Universität Heidelberg — 2InnovationLab GmbH, Heidelberg — 3Centre for Advanced Materials, Universität Heidelberg
In organic semiconductors charge transfer (CT) is crucial for all kinds of applications but its basic mechanisms are still under severe discussion. Especially a better knowledge of CT at organic/organic and inorganic/organic interfaces is essential for the design of new electronic devices with improved performance.
In this study we want to introduce a new approach to investigate CT at interfaces by means of in situ infrared (IR) spectroscopy. We investigated the system 4,4’-bis(N-carbazolyl)-1,1’-biphenyl (CBP)/MoO3, as a prototypical example, and spectroscopically identified charged and non-charged species of CBP molecules, that were deposited onto MoO3. Both species can be distinguished by their specific vibrational modes in the mid IR range. The inverted layer structure with MoO3 deposited onto CBP shows a significantly different behavior that is attributed to the diffusion of MoO3 into the organic film.
Financial support by BMBF (project MESOMERIE) is gratefully acknowledged.