Berlin 2008 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces
DS 18.33: Poster
Dienstag, 26. Februar 2008, 14:30–19:30, Poster A
Molecular orientation in Au-molecular layer-GaAs diodes studied by IR ellipsometry — •Dana Maria Rosu1, Aaron Trionfi3, Julia Hsu3, Karen Kavanagh4, Ullrich Schade2, Norbert Esser1, and Karsten Hinrichs1 — 1ISAS - Institute for Analytical Sciences, Department Berlin, Albert-Einstein-Str. 9, 12589 Berlin, Germany — 2Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung mbH, Albert-Einstein-Str. 15, 12589 Berlin, Germany — 3Sandia National Laboratories, Albuquerque, New Mexico 87185- 1120 — 4Kavanagh Lab, Dept. of Physics, Simon Fraser University, 8888 University Dr., Burnaby, BC, V5A 1S6, Canada
Synchrotron mapping IR ellipsometer at BESSY[1] was used for investigation of molecular orientation and lateral homogeneity in different organic-GaAs hybrid diodes with a lateral resolution below 1 mm2. Organic films on GaAs and Au are compared, the organic layer being either octanedithiol (C8DT), or hexadecanethiol (C16MT). Analysis of the CH2 stretching vibrations provides informations on the structure of the main backbone, while the CH3 stretching bands is giving informations about the structure and orientation of the end group of the molecules. The bands for C16MT on GaAs show a different orientation in comparison with C8DT. Evaluation of measured spectra with optical models enables spectra interpretation.
[1] M. Gensch, N. Esser, E. H. Korte, U. Schade, K. Hinrichs, Infrared Physics and Technology 49 (1-2) (2006) 39-44