Perovskite lead halide CsPbBr3, which is one of the most popular halides. Colloidal CsPbX3 (X = Cl, Br, I) nanocrystals have exhibited bright luminescence with quantum yields up to 98% and narrow emission wavelengths that can be tuned over the entire range depending on the size of the nanocrystal, its dimensionality and its halide ion composition. We have been successful in studying the process of anion exchange in nanocrystals of CsPbBr3 using a simple approach that has not been reported. This approach is based on using solid halide precursors in nonpolar organic solvents and does require additional ligands or alcohols typically used for dissolution of halides' precursors. During summer visiting faculty project, we systematically investigated the role of cations of halides precursors and the role of nonpolar solvent in anion exchange reactions. The results indicate that (i) anion exchange reactions can take place both in solution and at the solid interface of solid halide precursors and (ii) morphology of CsPbBr3 affects the rate of the ion exchange. Further studies are needed to understand the mechanism of the ion exchange process and establishing the correlation between the morphology of CsPbBr3 nanostructures. We aim to conduct studies on correlation of the surface area of the solid halide precursors and solubility of the inorganic precursors in non-polar solvents. We would like to continue working on this project and take it towards completion by doing UV-Vis and Photoluminescence studies of the cation-exchange process along with XRD and TEM measurements in future to study the structure and morphology of the samples. In-depth studies will be done on AgCl, NH4Cl, NH4I and NH4F so as understand the transformation process in detail.
Position Requirements
Job Family
Visiting Faculty Appointment
Job Profile
Guest Faculty Research Participant
Worker Type
Faculty
Time Type
Part time
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