Download Electronic Structure of Metal Phthalocyanines on Ag(100) by Cornelius Krull PDF

By Cornelius Krull

The software of molecules in technological units hinges at the right knowing in their habit on metal electrodes or substrates. The intrinsic molecular digital and magnetic homes are converted at a metal interface, and significantly rely on the atomic configuration of the molecule-metal bond. This poses yes difficulties, equivalent to the inability of reproducibility within the shipping homes of molecular junctions, but additionally deals the chance to urge new cost and spin configurations which are basically current on the interface. the implications awarded during this thesis deal with this factor, supplying a complete evaluation of the impression of molecule-metal and molecule-molecule interactions at the digital and magnetic homes of molecules adsorbed on metal substrates. utilizing metal-phthalocyanines (MePc), a time-honored metal-organic advanced as a version approach, every one bankruptcy explores diverse facets of the interplay with silver surfaces: the neighborhood adsorption geometry, self-assembly, the ameliorations of the digital and magnetic features as a result of hybridization and cost move, and eventually the manipulation of molecular cost and spin states via electron doping utilizing alkali atoms moved with the STM tip.

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Before the MePc (Sigma Aldrich, 99 % pure powder) they can be used in UHV, it is necessary to throughly degas the powder to achieve a base pressure during evaporation below p < 5 × 10−10 mbar. First we cleaned the Ag(100) (Surface Preparation Laboratories) surface by repeated sputtering with Ag+ ions and subsequent annealing to 450◦ C. We monitored the surface quality by Low Energy Electron Diffraction (LEED). Once a clean surface was obtained the molecules were evaporated from the molecular beam source onto the sample, which was kept at room temperature.

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