Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Colloids and Nanoparticles III

CPP 16.3: Talk

Tuesday, March 27, 2007, 17:30–17:45, H47

High-resolution photoemission study of II-VI semiconductor nanoparticles — •Tina Graber, Franziska Niederdraenk, Christian Kumpf, Achim Schöll, and Eberhard Umbach — Universität Würzburg, Experimentelle Physik II, Am Hubland, 97074 Würzburg

Semiconductor nanoparticles are of rapidly increasing interest due to their various actual and potential applications, such as, e.g., active components in LEDs or solar cells. Very small (1-5 nm) particles are also of particular interest in fundamental research since they represent a size scale which is in between the well-established descriptions of solid state and molecular physics.

We report on high resolution X-ray photoemission data of ZnO, CdSe and CdSe/ZnS core-shell nanoparticles in the range of 1-5 nm diameter. The particles were produced by a wet-chemical preparation method with organic stabilizers and drop-deposited on H-passivated silicon and polycrystalline Au substrates. A detailed analysis was performed to identify the various contributions from the core, shell, interface, and surface to the total signal in order to understand the influences of different synthesis routes on the particle composition. Influences of different solvents as well as beam damage and aging processes are discussed.