Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 49: Quantum Dots: Optical Properties III

HL 49.9: Vortrag

Mittwoch, 22. März 2017, 12:00–12:15, POT 151

Spectroscopic Properties of CdTe Quantum Wires at Cryogenic Temperatures — •Svenja Patjens, Andreas Nielsen, Philip Harder, Tobias Kipp, and Alf Mews — Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, 20146 Hamburg, Germany

One-dimensional semiconductor quantum wires grown by the solution-liquid-solid (SLS) mechanism or similar methods typically consist of alternating segments of zinc blende and wurtzite phases. [1] Here, we investigate the optical properties of near phase-pure and polytypic cadmium telluride nanowires via confocal microscopy. The wurtzite phase distribution in the wires, prepared by the solution-solid-solid (SSS) method [2], was analyzed by means of high resolution transmission electron microscopy (HRTEM). Photoluminescence spectroscopy of single specimens at cryogenic temperatures (T <9 K) revealed several distinct features and spectral shifts with respect to measurements at room temperature. Low-temperature fluorescence spectra of WZ-phase and polytypic wires were compared in order to get an insight into the effect of phase-alternations and domain sizes. We gratefully acknowledge financial support by the DFG vie KI 1257/2 and ME 1380/16-3.

[1] D. Franz et al., Nano Lett., 2014, 14 (11), pp 6655-6659

[2] F. Wang et al., Nano Lett., 2016, 16 (2), pp 889-894