Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 68: II-VI Semiconductors: mainly Optical Properties

HL 68.2: Vortrag

Freitag, 26. März 2010, 11:45–12:00, H17

Optical characterization of CdSe/Cd(S,Se)/ZnS core-shell-shell collodial quantum dots — •Martin Pohl¹, Sergey Skripets¹, Martin Kneip¹, Dmitrii Yakovlev¹, Manfred Bayer¹, Celso Mello-Donega² und Daniel Vanmaekelbergh² — ¹Experimentelle Physik E2, TU Dortmund, Deutschland — ²Debye Institut, Universität Utrecht, Niederlande

The optical properties of collodial CdSe/Cd(S,Se)/ZnS core-shell-shell quantum dots with varying dot density 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.

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.