Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.126: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Investigation of hot electrons below the surface — •Johannes Hopster1, Thorsten Peters1, Christian Haake1, Detlef Diesing2, Andreas Wucher1, and Marika Schleberger1 — 1Fachbereich Physik, Universität Duisburg-Essen, Lotharstrasse 1, 47057 Duisburg, Germany — 2Physikalische Chemie, Universität Duisburg-Essen, 45117 Essen, Germany
In many physical processes energetic (hot) charge carriers play a significant role. Hot electrons may be produced in different ways, e.g. by energetic ions, laser beams or directly by a monoenergetic electron beam. Our aim is to investigate the spatial and temporal development of the electron energy distribution below the surface. To detect the hot charge carriers thin film metal insulator metal junctions (MIMs) are used. The measured yield of electron transmission through the insulator barrier depends on the initial excitation energy, the top electrode thickness, the material of the top electrode and the barrier height. By applying a bias voltage between the two metal electrodes energy dispersive measurements are possible. Corresponding data that has been obtained on various MIMs will be presented.