Regensburg 2004 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 16: POSTER: Computational Physics, Complex Systems
CPP 16.23: Poster
Tuesday, March 9, 2004, 17:00–19:00, B
Phtalocyanines at ZnO-Single Crystals — •Peter Kunze1, Malgorzata Boruszczak2, Christine Mattheus1, Derck Schlettwein1, and Katharina Al-Shamery1 — 1Institute of Pure and Applied Chemistry, Faculty V, University of Oldenburg, Oldenburg, Germany — 2Uniwersytet Lodz, Lodz, Poland
The aim of this study is to build up solar cells made of zinc oxide and organic pigments, especially phthalocyanines and perylenes. This requires accurate knowledge about the structures and binding between the Zinc oxide and the organic component. In a UHV-chamber phthalocyanines, subphthalocyanine and MePTCDI have been deposited onto Zinc oxide of (0001)- and (10-10)-orientation. UV-VIS measurements reveal the formation of different film morphologies depending on the different surface orientations of zinc oxide. RHEED investigations showed no lateral ordering of the phthalocyanines either at the (0001) or the (10-10) surface. Additionally AFM measurements have been performed on these samples. They indicate Vollmer-Weber growth with Islands up to 15nm height and up to 100nm width at ZnO (0001). At ZnO (10-10) Stranski-Krastanov-growth is observed with the build up of closed monolayers on which islands of about 10nm height and up to 40nm width can be found. None of the phthalocyanines, but PcVO showed lateral ordering in the RHEED pictures. According to the AFM pictures PcVO showed elongated islands of about 100nm length and only 10nm width which appear to be ordered in small domains. Beside domains of different orientations unordered areas could be seen as well. This supports the results of the RHEED investigations.