Regensburg 2004 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 14: Schichtwachstum
DS 14.3: Vortrag
Mittwoch, 10. März 2004, 15:00–15:15, HS 32
Early Stages of Self-assembled Nanostructure Formation during Cu Deposition onto VSe2 Crystals — •S. Hollensteiner1, E. Spiecker1, W. Jäger1, H. Haselier2, and H. Schroeder2 — 1Technische Fakultät der CAU zu Kiel — 2Forschungszentrum Jülich
Recent investigations have shown that Cu deposition onto surfaces of layered VSe2 crystals may lead to self-assembled networks of nanostructures. TEM, SEM and AFM have been applied to characterize evolution, lateral arrangements, orientations, and the microscopic nature of the surface structures. The nanostructures were created applying UHV electron beam evaporation of Cu onto cleaved layered VSe2 crystals. The nominal Cu coverages are ranging from 0.4 nm to 2.5 nm. At the lowest coverage large isolated nanostructures with lateral dimensions > 100 nm are observed having a roof-like tile structure. At coverages of 1 nm and above a uniform network of linear nanostructures of smaller lateral dimension (∼ 20 nm) with mainly hexagonal meshes develops on substrate terraces in addition to the large nanostructures. Like the large nanostructures the smaller ones are composed of two crystalline strands. Inside the meshes, a thin layer of a new phase of uniform thickness has evolved being almost completely contiguous but separates into three equivalent orientation variants with epitaxial relationship to the substrate. These results and the absence of Cu clusters point to the formation of an intercalation phase. A dense network of dislocations has formed at the interface indicating the presence of in-plane strain. The role of strain for the formation and evolution of both the nanoroofs and the network of smaller nanostructures is discussed.