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HL: Halbleiterphysik

HL 23: II-VI Halbleiter II

HL 23.6: Talk

Saturday, March 5, 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.