Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 9: Poster I
HL 9.43: Poster
Montag, 27. März 2006, 15:15–17:45, P3
Composition Dependent Properties of Structured II-VI Semiconductor Nanoparticles — •Sofia Dembski1, Christina Graf1, Reinhard Neder2, and Eckart Rühl1 — 1Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg — 2Institut für Mineralogie und Kristallstrukturlehre, Universität Würzburg, Am Hubland, D-97074 Würzburg
II-VI-Semiconductor nanoparticles (quantum dots, QD) have unique size-dependent optical and electronic properties. Especially, small nanoparticles have a large surface-to-bulk ratio. Therefore, it is expected that the particle surface dominates their properties so that the local environment near the surface strongly influences their properties. We present a systematic study on optical, electronic, and structural properties of QD in selected environments. CdSe-ZnS core-shell nanoparticles are obtained from the high temperature thermolysis of organometallic precursors in coordinative solvents. These particles are subsequently functionalized either by an exchange of their ligands or by the reversible coating with an amphiphilic polymer. As a result, the particles can be studied in various environments. The crystal structure of the QD is characterized by transmission electron microscopy (TEM) and x-ray diffraction (XRD). The influence of the local environment on the optical properties of the QD is studied by optical absorption and photoluminescence spectroscopy.