CsPbBr3 Perovskite Nanowires: Synthesis, Optical properties and Single Particle Tracking

Basak, Ankit (2021) CsPbBr3 Perovskite Nanowires: Synthesis, Optical properties and Single Particle Tracking. Masters thesis, Indian Institute of Science Education and Research Kolkata.

Text (MS Dissertation of Ankit Basak (16MS056)) 16MS056_Thesis_file.pdf - Submitted Version Restricted to Repository staff only Download (1MB)

Abstract

Semiconductor nanocrystals have a variety of applications implementing their tunable opto-electronic properties. Among the semiconductor nanocrystals, the nanowire morphology offers exceptional mechanical flexibility and high aspect ratio tunability required for engineering purposes whereas the lead halide perovskite material offers superior opto-electronic properties. In this dissertation, cesium lead bromide nanowire morphologies have been synthesized with an aim to combine the robust mechanical and opto-electronic properties together and study the aspect ratio dependent optical properties of these nanowires. Using a synthetic strategy combining a mixture of relatively hard and soft amine ligands, nanowires with aspect ratio ranging from ~30 to ~300 have been synthesized with variation of reaction time. The Stokes shift and PLQY have been observed to decrease with increasing aspect ratio whereas excited state lifetime increases with increasing aspect ratio. Detailed analysis provides information about the nature of change of excitation wavelength dependent PLQY and the radiative and non-radiative decay rate constants with change in aspect ratio. A parallel aim of this dissertation is the design of a platform for deriving diffusion data from single-particle experiments implementing semiconductor nanocrystals in aqueous media. Towards this direction CuInS2-ZnSeS based core-alloy-shell quantum dots dispersed in aqueous medium have been used for single particle TIRF microscopy experiments. Implementing a robust hybrid manual-automatic tracking software single particle trajectories have been analyzed to generate diffusion-based data of the surroundings of the quantum dot. This platform holds promise for extension of single particle tracking experiments for in vivo biological tissues using water dispersed nanowire morphologies which was not completed due to the time constraints of the pandemic and is therefore an exciting future research prospect.

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