Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 16: Organic Thin Films I

DS 16.3: Talk

Tuesday, March 12, 2013, 15:15–15:30, H32

Spectroscopy on N-Type Doped Manganese Phthalocyanine — •Michael Ludemann¹, Francisc Haidu¹, Philipp Schäfer¹, Benjamin Mahns², Daniel Lehmann¹, Ovidiu D. Gordan¹, Jens Kortus³, Martin Knupfer², and Dietrich R.T. Zahn¹ — ¹TU Chemnitz, 09126 Chemnitz, Germany — ²IFW Dresden, 01069 Dresden, Germany — ³TU BA Freiberg, 09596 Freiberg, Germany

In the fabrication processes of organic semiconductor devices, n-type doping of organic thin films still remains challenging. Intercalated alkali metals act as electron donors and thus increase the electrical conductivity of transition metal phthalocyanines [1]. In this study, manganese phthalocyanine (MnPc) thin films (5–100 nm) are prepared by organic molecular beam deposition (OMBD) under ultra-high vacuum (UHV) conditions. Doping is achieved via subsequent potassium (K) evaporation afterwards. Electron energy loss spectroscopy (EELS) [2] and in situ spectroscopic ellipsometry (SE) reveal that the optical properties of MnPc change dramatically during K doping. Finally, in situ online monitoring of the vibrational properties provides deep insight into the doping dynamics. In this work, the results obtained by EELS, SE, and Raman spectroscopy are compared, showing a formation of consecutive potassium doped MnPc phases with distinct optical and vibrational properties.

[1] M. F. Craciun et al. J. Am. Chem. Soc. 127 (2005) 12210

[2] B. Mahns et al. J. Chem. Phys. 134 (2011) 194504