Dresden 2006 – scientific programme

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DS: Dünne Schichten

DS 10: Thin organic films I

DS 10.5: Talk

Tuesday, March 28, 2006, 10:30–10:45, GER 38

Ellipsometric Study of an Organic Template Effect — •Ovidiu D. Gordan¹, Takeaki Sakurai², Katsuhiro Akimoto², Marion Friedrich¹, and Dietrich R. T. Zahn¹ — ¹Chemnitz University of Technology, Semiconductor Physics, D-09107 Chemnitz, Germany — ²Institute of Applied Physics, University of Tsukuba, Japan

The research of the last decade proved that organic materials can be used as a low cost alternative to inorganic semiconductors. However, optimizing the performance of the organic devices remains a challenging task, as the electronic and optical properties of the organic layers strongly depend on the preparation conditions and molecular orientation. It was already shown [1] that the molecular orientation can be controlled using an organic template layer.

In this work we demonstrate the template effect of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) on metal-free phthalocyanine H₂Pc molecules studied by spectroscopic ellipsometry. From the differences [2] between in-plane and out-of-plane components of the dielectric function, the molecular orientation was deduced. It was found that the strong interaction of the PTCDA π orbitals with the H₂Pc π orbitals modifies the growth mode of H₂Pc molecules on PTCDA with respect to the growth on glass and oxidised silicon substrates.

[1] T. Sakurai, S. Kawai, J. Shibata, R. Fukasawa and K. Akimoto, Jpn. J. Appl. Phys. 44 (2005) 1982

[2] O. Gordan, M. Friedrich, D. R. T. Zahn, Organic Electronics 5 (2004) 291