Dresden 2011 – scientific programme

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DS: Fachverband Dünne Schichten

DS 65: Organic Thin Films IV

DS 65.6: Talk

Friday, March 18, 2011, 17:15–17:30, GER 38

In Situ Surface Enhanced Raman Spectroscopy of Ultra-Thin CuPc Films — •Michael Ludemann, Ovidiu D. Gordan, and Dietrich R. T. Zahn — Semiconductor Physics, Chemnitz University of Technology

In order to characterize the vibrational properties of copper phthalocyanine (CuPc) films, specially designed substrates with metallic nanostructures are applied. Illuminating these substrates with a laser that meets the plasmonic resonance of the nanostructure gives rise to a dramatic enhancement of the Raman scattered intensity. This effect offers the possibility to detect ultra-thin films, even sub-monolayer coverage of CuPc molecules within short exposure times. For ultra-thin films strong enhancement is also found when the laser does not meet the designed resonance condition of the nanostructures.

The samples are prepared by nanosphere lithography and CuPc is deposited by organic molecular beam deposition (OMBD) afterwards. The measurements are performed in situ under ultra-high vacuum (UHV) conditions. The focus of this work lies on the Raman intensity dependence on the excitation wavelength and the influence of the CuPc layer thickness.