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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 1: Bandalignment in Organic Materials

SYSA 1.2: Vortrag

Dienstag, 26. Februar 2008, 10:00–10:15, H 0105

Consistent experimental determination of the charge neutrality level and the pillow effect at metal/organic interfaces — •Mandy Grobosch¹, Olga V. Molodtsova¹, Victor Yu. Aristov^1,2, and Martin Knupfer¹ — ¹IFW Dresden, D-01069 Dresden, Germany — ²Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow distr., 142432, Russia

Experimental results of combined X-ray and ultraviolet photoemission spectroscopy studies for the interface dipoles at metal/organic and organic/organic heterointerfaces have been analyzed on the basics of the induced density of interfaces states model(1,2). For the estimation of the interface dipole as well as the metal work function we have analyzed the following interfaces: Au/CuPc, Ag/CuPc, Au/CuPcF4, Ag/CuPcF4, and the respective heterointerfaces between copper phthalocyanine (CuPc) and its fluorinated relative (CuPcF4). We demonstrate that a consistent analysis of a selected set of interfaces is possible, which allows the determination off all microscopic parameters of the model, and moreover enables the prediction of the electronic properties of further, yet unknown interfaces. This additionally represents a starting point for the experimental determination of further important material dependent parameters such as the charge neutrality level of organic semiconductors.

1 H. Vazquez, F. Flores, and A. Kahn, Organic Electronics 8, 241 (2007).

2 H. Vazquez, Y.J. Dappe, J. Ortega, and F. Flores, J. Chem. Phys. 126, 144703 (2007).