Metal halide perovskites are new materials of interest in the field of nanoscience due to the increased efficiency of solar cells containing them. Our work surrounds the synthesis of cesium lead bromide (CsPbBr<sub>3</sub>), subsequent halide exchanges to cesium lead chloride and iodide, and molar extinction coefficient calculations for the bromide and iodide species. By varying ratios of chloride and iodide ions in solution, homogeneous nanocrystals were created that were mixtures of the original parent compounds and the emission spectra showed maxima across the entire spectral region. The optical properties of all CsPbX<sub>3 </sub>(X = Cl, Br, I) nanocrystals were characterized by absorbance and fluorescence spectroscopy, and crystal structure and size were determined by x-ray powder diffraction and transmission electron microscopy. The concentration of cations in the samples were determined using induced coupled plasma optical emission spectroscopy (ICP-OES). Using spectroscopy and mathematical modeling the extinction coefficients for the bromide and iodide species were determined. Knowledge of the extinction coefficients is imperative for further studies on these materials, as precise concentrations are known.

Anion exchange and extinction coefficient determination of cesium lead halide nanocubes

2019 Spring National Meeting

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.