Synthesis and Optical Properties of Lead-Free Cesium Tin Halide Perovskite Nanocrystals
Authors
Jellicoe, Tom C
Richter, Johannes
Glass, Hugh
Tabachnyk, Maxim
Brady, Ryan
Rao, Akshay
Böhm, Marcus L
Publication Date
2016-02-22Journal Title
Journal of the American Chemical Society
ISSN
0002-7863
Publisher
ACS Publications
Volume
138
Pages
2941-2944
Language
English
Type
Article
Metadata
Show full item recordCitation
Jellicoe, T. C., Richter, J., Glass, H., Tabachnyk, M., Brady, R., Dutton, S., Rao, A., et al. (2016). Synthesis and Optical Properties of Lead-Free Cesium Tin Halide Perovskite Nanocrystals. Journal of the American Chemical Society, 138 2941-2944. https://doi.org/10.1021/jacs.5b13470
Abstract
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 CsSnX$_{3}$ (X = Cl, Cl$_{0.5}$Br$_{0.5}$, Br, Br$_{0.5}$I$_{0.5}$, 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.
Sponsorship
This work was supported by the EPSRC (grant nos. EP/ M005143/1, EP/G060738/1, EP/G037221/1). J.M.R. and M.T. thank the Winton Program for Sustainability for financial support, and M.T. further acknowledges the Gates Cambridge Trust for funding. D.C. is a Royal Society Research Fellow.
Funder references
EPSRC (EP/M005143/1)
EPSRC (EP/G060738/1)
EPSRC (EP/M006360/1)
EPSRC (EP/G037221/1)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1021/jacs.5b13470
This record's URL: https://www.repository.cam.ac.uk/handle/1810/254114
Rights
Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International, Attribution 4.0 International