Synthesis and Optical Properties of Lead-Free Cesium Tin Halide Perovskite Nanocrystals.
By Tom C Jellicoe, Johannes M. Richter, H. Glass, Maxim Tabachnyk, Ryan A Brady, S. Dutton, A. Rao, R. Friend, D. Credgington, N. Greenham and 1 more. Journal of the American Chemical Society, 2016
802 citations recorded by the source corpus.
Metal halide perovskite crystal structures have emerged as a class of optoelectronic materials, which combine the ease of solution processability with excellent optical absorption and emission qualities. Restricting the physical dimensions of the perovskite crystallites to a few nanometers can also unlock spatial confinement effects, which allow large spectral tunability and high luminescence quantum yields at low excitation densities. However, the most promising perovskite structures rely on lead as a cationic species, thereby hindering commercial application. The replacement of lead with nontoxic alternatives such as tin has been demonstrated in bulk films, but not in spatially confined nanocrystals. Here, we synthesize CsSnX3 (X = Cl, Cl0.5Br0.5, Br, Br0.5I0.5, I) perovskite nanocrystals and provide evidence of their spectral tunability through both quantum confinement effects and control of the anionic composition. We show that luminescence from Sn-based perovskite nanocrystals occurs on pico- to nanosecond time scales via two spectrally distinct radiative decay processes, which we assign to band-to-band emission and radiative recombination at shallow intrinsic defect sites.
Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/ab6372a7a5d13e2f0f74b12bfdce0e3d41c0fd03
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Citations in the corpus
- Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications, and Their Optical Properties (2019, methodology): “The former group was able to prepare CsSnX3 NCs by reacting SnX2 salts, dissolved in tri-n-octylphosphine (TOP) and subsequently injecting the resulting solution into a mixture of CsCO3, OA and OLA at 170C.(79) Wang at al.”