Publication date: 3rd July 2020
For varying the size of perovskite nanocrystals, variation in the reaction temperature and tuning the ligand chain lengths are established as the key parameters for high-temperature solution-processed synthesis. These also require sharp cooling for obtaining desired dimensions and optical stability. In contrast, using preformed alkylammonium bromide salt as the precise dimension-controlling reagent, wide window size-tunable CsPbBr3 nanocrystals are presented without varying the reaction temperature or changing the ligands. The size tunability even with ∼1 nm step-growth regime is achieved as a function of only the concentration of added alkylammonium bromide salt. Not only the cube shape but also the width varied in the sheet structures. Because these nanostructures lose their optical stability and crystal phase on prolonged annealing, stabilizing these in high-temperature synthesis for all-inorganic lead halide perovskites is important and remains challenging. In this aspect, this method is proven to be more facile because it does not require sharp cooling, and the stable emission, size, shape, and phase of the nanocrystals remained intact even on prolonged annealing, which was typically not observed in standard synthetic routes. Although this approach may lead to a more widespread synthesis of these materials, the chemistry of controlling the dimensions of ionic perovskites is still not clearly understood, and such an understanding is necessary for better control of the synthesis of these nanostructures.
TRC at IACS, internal faculty grants and DST are acknowledged for funding. Sumit Kumar Dutta acknowledges CSIR for SPM fellowship. IACS capital grant is acknowledged for obtaining the TEM used for imaging. Prof. Narayan Pradhan is acknowledged for his constant support and supervision throughout the project. All lab mates are also acknowledged for their constant support.
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