Berlin 2015 – scientific programme
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DS: Fachverband Dünne Schichten
DS 20: Focussed Session: In-situ optical spectroscopy
DS 20.2: Invited Talk
Wednesday, March 18, 2015, 10:00–10:30, H 0111
In situ Raman monitoring of Potassium intercalation in Manganese Phthalocyanine — •Ovidiu D. Gordan1, Michael Ludemann1,2, Franziska Lüttich1, Dmytro Solonenko1, Philipp Schäfer1, and Dietrich R.T. Zahn1 — 1Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz — 2now at Anfatec Instruments AG, D-08606 Oelsnitz (V)
Charge redistribution in the molecular orbitals of organic molecules can be used to adjust their optical, electrical, and magnetical properties. In the case of metal phthalocyanines (MPc) this can be done by e.g. potassium intercalation. However, the effects of additional charges on the molecule geometry and the corresponding rearrangement of the molecular orbitals as well as the question whether the charge is electrically active or not are theoretically hard to predict. The entire picture gets more complicated by the formation and coexistence of several charged states between the organic molecule and dopant. Here the intercalation process is studied by in situ Raman monitoring. The corresponding Raman spectra reveal extremely strong changes when ultra-thin layers of MnPc prepared by organic molecular beam deposition in ultra-high vacuum are exposed to potassium. These changes can directly be related to the formation of distinct charged phases. The results presented thus beautifully illustrate that in situ Raman spectroscopy is a powerful tool for monitoring the dynamics of the intercalation process. Moreover, using organic field effect structures in the Raman experiment the different charged stages can be related to changes in the conductivity.