Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Active control over the shape, composition and crystalline habit of nanocrystals is a long sought-after goal. Various methods have been shown to enable post-synthesis modification of nanoparticles, including the use of the Kirkendall effect, galvanic replacement and cation or anion exchange, all taking advantage of enhanced solid-state diffusion on the nanoscale. In all these processes, however, alteration of the nanoparticles requires introduction of new precursor materials. Here we show that for cesium lead halide perovskite nanoparticles, a reversible structural and compositional change can be induced at room temperature solely by modification of the ligand composition in solution.1,2 This scheme does not only enable fabrication of high purity monodisperse Cs4PbX6 nanoparticles with controlled sizes. Rather, dependent on the Cs4PbX6 nanoparticles final size afforded by reaction time, the back reaction yields CsPbX3 nanoplatelets with controlled thickness. These results provide insight on the very significant role of the exact ligand composition on surface stabilization (and, concomitantly, destabilization) in lead halide perovskites, and present a new post-synthetic pathway to control their morphology and composition.
References:
1. Thumu Udayabhaskararao, Miri Kazes, Lothar Houben, Hong lin, Dan Oron Chem. Mater., 2017, 29 (3), pp 1302–1308
2. Thumu Udayabhaskararao, Miri Kazes, Lothar Houben, Ayelet Teitelboim, Dan Oron
arXiv:1702.05382
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