Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 33: Poster Session III

HL 33.29: Poster

Mittwoch, 14. März 2018, 17:30–19:30, Poster F

Optical spectroscopy on single semiconducting hetero dot-in-rod nanostructures: A comparison of type-I (CdSe/CdS) and type-II (ZnSe/CdS) systems — •Hans Werners, Sven Lohmann, Alexandra Hinsch, Christian Strelow, Tobias Kipp, and Alf Mews — Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, 20146 Hamburg, Germany

Single CdSe/CdS dot-in-rod nanostructures are well researched in terms of their optical properties. The band offset of these structures characterizes CdSe/CdS as Type-I semiconductors. Here, we compare recent results obtained in single-nanocrystal spectroscopy of CdSe/CdS dot-in-rods [1] to results on type-II systems.

For this approach we successfully synthesized ZnSe/CdS dot-in-rods. Single ZnSe/CdS dot-in-rod structures were investigated by confocal fluorescence spectroscopy at room and cryogenic temperatures. We measured lifetimes, intensity time traces, emission spectra, and polarization properties of these dot-in-rods for different excitation wavelengths. Our first data indicate a type-II behavior leading to considerably longer lifetimes as compared to the CdSe/CdS case.

[1] S. Lohmann et al., ACS Nano Article ASAP DOI: 10.1021/acsnano.7b05303