Berlin 2005 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 23: II-VI Halbleiter II
HL 23.6: Vortrag
Samstag, 5. März 2005, 12:00–12:15, TU P-N202
Optical Properties of Colloidal CdSe-Nanocrystals: Size, Shape and Temperature Dependence of Luminescence Dynamics. — •Oliver Schöps1, E. Herz2, M.V. Artemyev3, C. Arens4, N. Rousseau4, D. Schikora4, K. Lischka4, and U. Woggon1 — 1Universität Dortmund, Institut für Physik, Experimentelle Physik IIb, Otto-Hahn-Strasse 4,D-44227 Dortmund — 2Cornell University,Ithaca, NY — 3Belarussian State University, Minsk — 4Universität Paderborn
CdSe nanocrystals show enormous potential concerning their applications in photonic devices due to the size tunability of their emission wavelength and their high quantum yield. The wet chemical preparation allows the control of size and shape from spherical nanocrystals to elongated nanorods. Here the spectrally as well as temporally resolved photoluminescence (PL) data is analysed. Transitions between excitonic fine structure levels govern the population dynamics and therefore the PL decay times. With increasing size the nanorods’ PL properties display a transition from a fully confined, zero dimensional to a one dimensional structure. We furthermore address the modification of the PL, when a novell overgrowth technique is applied to incorporate colloidal nanoparticles in a MBE grown ZnSe Matrix.