Nanocrystals

II-VI semiconductor nanocrystals have been extensively studied by the soft chemistry method. In addition to a control on the size, one has found modulation of the shape under various experimental conditions. This increases the surface area for similar-sized objects and facilitates use in various applications such as catalysis where the increased surface area would imply more active sites. While experiments on hybrid perovskites have found only cubic facets, recently it was shown for CsPbX3 (X= Br,Cl) under certain experimental conditions [1] one found a faceted polyhedron which could be transformed into a hexapod. In this talk, I will present our recent work [2] in which we have examined Mn doping into the low energy facets. Doping into different facets is found to lead to emissive facets in some instances, and non-emissive facets in other instances. These studies help us explain how the same dopant atom in different shapes of the same material could have different emissive properties.

[1] Arm growth and facet modulation in perovskite nanocrystals. Lucheng Peng, Sumit Kumar Dutta, Debayan Mondal, Biswajit Hudait,Sanjib Shyamal, Renguo Xie, Priya Mahadevan, and Narayan Pradhan, J. Am. Chem. Soc. , 2019 , 141, 40, 16160-16168.

[2] Shape Control of Emissive Properties of Mn-Doped CsPbBr3 Nanocrystals. Debayan Mondal and Priya Mahadevan J. Phys. Chem. C 2021, 125, 21, 11462–11467.