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HL: Fachverband Halbleiterphysik

HL 61: Poster II: Materials, Interfaces and Heterostructures

HL 61.26: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D1

Optical investigations of excitons in collodial semiconductor nanocrystals — •Sergey Skripets¹, Martin Pohl¹, Martin Kneip¹, Dmitrii Yakovlev¹, Manfred Bayer¹, Celso Mello-Donega², Dominika Grodzinska², and Daniel Vanmaekelbergh² — ¹Experimentelle Physik E2, TU Dortmund, Deutschland — ²Debye Institut, Universität Utrecht, Niederlande

The optical properties of collodial semiconductor quantum dots with varying concentration were studied by means of optical methods. In these systems, electrons, holes and excitons are strongly confined in the nanocrystal host, resulting in discrete energy levels for these nanocrystals. Investigations were performed in resonant and nonresonant excitation regime over a wide temperature range from 2 up to 300 K with magnetic fields between 0 and 10 T. Furthermore the relaxation time of the photoluminescence was studied in picosecond range by means of streak camera and nanosecond range by means of gated ccd. Results will be shown for PbSe,CdSe core-shell and CdSe/Cd(S,Se)/ZnS core-shell-shell structures.

The workings were done in the framework of the Herodot-program "heterogeneous quantum rod and quantum dot nanomaterials" at the physics department of the TU Dortmund with samples grown at the University of Utrecht.