SKM 2023 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Perovskite and photovoltaics II (joint session HL/CPP)
CPP 33.2: Talk
Wednesday, March 29, 2023, 10:00–10:15, JAN 0027
Silver-nanoclusters and -vacancies influence the optical properties of Cs2AgBiCl6 nanocrystals — •Fei He1, Yiou Wang1, Quinten A. Akkerman1, Markus Döblinger2, Amrita Dey1, and Jochen Feldmann1 — 1Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität, Königinstraße 10, 80539 Munich, Germany — 2Department of Chemistry, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (E), 81377 München, Germany
Though being indirect semiconductors Cesium-Silver-Bismuth-Halides (so-called double perovskites) have attracted much attention as a non-toxic alternative to Lead Halide Perovskites. Novel applications for solar cells and X-ray detectors have already been developed.
Here, we report on the successful synthesis of spherical Cs2AgBiCl6 nanocrystals showing good stability and characteristic photoluminescent spectra. In transmission electron microscopy (TEM) images we observe Ag-clusters on the surface of the nanocrystals. It is known that silver ions are easily reduced into metallic Ag leading to silver vacancies in the double perovskite material and probably to Ag-clusters on the surface. We discuss how silver-nanoclusters and -vacancies influence the luminescent behavior of the double perovskite nanocrystals and explain possible microscopic origins.