Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.28: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

Vibrational analysis of thin Zinc Tetraphenylporphyrin films on Si(111) — •Stephan Peter Kate¹, Karsten Hinrichs¹, Norbert Esser¹, Jörg Rappich², and Simona Pop¹ — ¹Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Albert-Einstein Str. 9, Berlin, 12489, Germany — ²Helmholtz-Zentrum for Materials and Energy GmbH, Kekulestraße 5, Berlin, 12489, Germany

The presented work includes micro-Raman spectroscopy for the analysis of the vibrational modes of the ZnTPP (Zinc Tetraphenylporphyrin) thin films. Resonant Raman spectra are taken with the 458 nm (2,71 eV) Ar-laser line which is located in the spectral range of the B-band. The Raman frequencies are compared for samples with different film thicknesses and ZnTPP crystalline powder. A systematic shift with increasing film thickness is observed for some vibrational modes while others are not affected by the film thickness. The changes in the vibrational bands are discussed with respect to symmetry and in the vibration involved parts of the molecules.