Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 67: Organic Semiconductors: Solar Cells II (Joint Session with DS/CPP/O)

HL 67.4: Talk

Friday, March 26, 2010, 11:00–11:15, H16

Spectroscopy of PTCDA deposited on an ultra thin optical fiber from a helium nanodroplet beam. — Tobias Knoblauch, •Matthieu Dvorak, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg im Breisgau

Optical nanofibres can be employed for ultra-sensitive surface spectroscopy of deposited molecules [1,2]. This method shows a good signal to noise ratio with surface coverage as small as 1/1000 of a monolayer, the reason of which stems from the strong evanescent field existing at the interface of optical fibres with sub-wavelength diameter.

Helium nanodroplet isolation (HENDI) spectroscopy is a powerful technique to analyze the vibrational structure of molecules as well as excitonic transitions of complexes and nanostructures at low temperatures [3]. In the present case, helium droplets are used to form complexes of PTCDA molecules having organic semiconducting properties and deposit them on an ultra thin fibre. In this way it is expected to link spectroscopic data obtained in the ultra-cold and interaction-free environment and film spectra.

[1] F. Warken et al., Optics Express 15, 11952 (2007)

[2] A. Stiebeiner et al., Optics Express 17, 21704 (2009)

[3] M. Wewer and F. Stienkemeier, Phys. Rev. B 67, 125201 (2003)