Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 4: Quantum dots and wires: Optical properties I

HL 4.7: Vortrag

Montag, 12. März 2018, 11:15–11:30, EW 201

Spectroscopic Properties of Semiconductor 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

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. This effect results in potential variations, which in turn may influence the optical properties of these materials.[1] Here, we spectroscopically investigate phase-pure and polytypic cadmium telluride nanowires via confocal microscopy. The crystal phase distribution throughout single wires was analyzed by means of high resolution transmission electron microscopy (HRTEM). These single nanostructures revealed several distinct features and spectral shifts, when being spectroscopically analyzed at cryogenic temperatures. The fluorescence spectra were correlated to HRTEM images in order to get an insight into the effect of phase-alternations and domain sizes. We gratefully acknowledge financial support by the DFG via KI 1257/2 and ME 1380/16-3.

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