Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 47: Quantum dots and wires: Optical properties II

HL 47.8: Vortrag

Freitag, 5. April 2019, 11:30–11:45, H34

Cutting of halide perovskite nanowires into single photon emissive low-aspect-ratio CsPbX3 (X=Cl, Br I) perovskite nanorods — •Philipp Konrad, Aurora Manzi, Yu Tong, Ming Fu, Eva Bladt, He Huang, Alexander Richter, Kun Wang, Peter Müller-Buschbaum, Sara Bals, Philippe Tamarat, Brahim Lounis, Jochen Feldmann, and Lakshminarayana Polavarapu — Chair for Photonics and Optoelectronics, Ludwig-Maximilians-Universität, München, Deutschland

Colloidal perovskite nanocrystals (NCs) have been highly investigated within the past few years due to their unique optical properties which make them favorable for LED and lasing applications. Their optical properties are strongly dependent on their dimensions. Despite rapid advances in the shape-control of perovskite NCs ranging from nanocubes to nanowires and nanoplatelets, it is hardly possible to obtain colloidal perovskite nanorods (NRs).

In this presentation, we will present our finding about the ligand-induced cutting of CsPbBr3 perovskite nanowires (NWs) into low aspect-ratio CsPbBr3 (X=Cl, Br and I) NRs. The shape transformation of Nws to NRs resulted in an increase of photoluminescence efficiency and longer exciton lifetimes compared to that of NWs. This indicates that the defect parts of the NWs gets separated during their breaking into NRs, otherwise the excitons are more likely to find a trap owing to large exciton diffusion lengths in perovskites. Interestingly, those NRs exhibit single photon emission as revealed by photon antibunching measurements, which is not detected in their parent NWs.