Regensburg 2013 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells
DS 32.15: Poster
Donnerstag, 14. März 2013, 17:00–20:00, Poster B2
IR spectroscopic studies of p-doped thin films of organic semiconductors — •Sebastian Beck1,2, David Gerbert1,2, Markus Gölz1,2, Tobias Glaser1,2, and Annemarie Pucci1,2 — 1Universität Heidelberg, Kirchhoff-Institut für Physik, INF 227, 69120 Heidelberg — 2InnovationLab GmbH, Speyerer Str. 4, 69115 Heidelberg
In this study, the underlying mechanisms and effects of doping were investigated by means of infrared spectroscopy. We examined doped and undoped thin films of organic semiconductors, such as 4,4*-Bis(N-carbazolyl)-1,1*-biphenyl (CBP), whereas different organic (e.g. 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ)) and inorganic (e.g. molybdenum oxid (MoO3)) materials were used as acceptor.
The additional charge on donor and acceptor molecules in doped systems leads to specific changes in the absorption spectra compared to the spectra of undoped thin films. From the appearance of new vibrational bands, spectral shifts, and broad electronic absorptions, information about the morphological, electronical and molecular properties of the thin films was obtained, for example, on the different segregation of organic and inorganic acceptor materials and the different degree of charge transfer between donor and acceptor.
Financial support by BMBF (project MESOMERIE) is gratefully acknowledged.