What is it about?
Halide perovskite nanocrystals hold great scientific and technological promise. Structural dynamics links their chemically tailored nanostructure to optoelectronic properties. We examine how perovskite nanocrystals’ lattice dynamics evolve with their size and shape, ranging from few nm nanoplates to ~ten nm nanocubes.
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Why is it important?
Our findings show how halide perovskite lattice dynamics evolve from nano to bulk. As halide perovskite nanocrystals grow in size and go out of quantum confinement, perovskite lattice vibrations activate and strengthen, and the phonon spectra approaches the form of the bulk material. Multiple vibrational modes broaden as the nanocrystal size increases. This is the opposite to conventional inorganic crystalline semiconductors’ behavior and contradicts the phonon confinement model.
Perspectives
This work offers a structural dynamics perspective to the question of “what are different between bulk and nano perovskite semiconductors?”. It shows how halide perovskite deviates from conventional semiconductors at the nanoscale.
Yinsheng Guo
University of Nebraska-Lincoln
Read the Original
This page is a summary of: Evolution of structural dynamics in cesium lead halide perovskite colloidal nanocrystals from temperature-controlled synthesis, The Journal of Chemical Physics, May 2024, American Institute of Physics,
DOI: 10.1063/5.0206402.
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