Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 41: Focus Session "Spins in Organic Materials II" (jointly with DS)

MA 41.2: Talk

Wednesday, March 16, 2011, 16:15–16:30, GER 37

Investigation of the chemical and electronic structure of CoPc from monolayer to thick films by photoemission spectroscopy — •Uwe Treske, Mandy Grobosch, Feng Zhu, and Martin Knupfer — IFW - Dresden

In this work monolayers and multilayers of cobalt(II)phthalocyanine (CoPc) were analysed with respect to their chemical and electronical properties. The organic material was deposited under ultra high vacuum conditions on single crystalline Au(100) (5×20 reconstruction) and Ag(111) surfaces that were cleaned by Ar⁺ bombardment and annealing cycles. The molecular ordering has been studied by low energy electron diffraction (LEED) and the morphology of thick films by scanning probe microscopy (AFM) that indicates a polycristalline growth.

The results of combined X-ray and ultraviolet photoemission spectroscopy (XPS, UPS) indicate clear differences in the valence band and Co2p core level spectra for mono- and multilayer due to charge transfer to the monolayer cobalt ion and a possible influence of image charge screening effects enhanced by the metal substrates. An additional interface state in the vicinity of the Fermi level was observed in the monolayer spectra.