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Essentially Trap-Free CsPbBr3 Colloidal Nanocrystals by Postsynthetic Thiocyanate Surface Treatment
Abstract
We demonstrate postsynthetic modification of CsPbBr 3 nanocrystals by a thiocyanate salt treatment. This treatment improves the quantum yield of both freshly synthesized (PLQY ≈ 90%) and aged nanocrystals (PLQY ≈ 70%) to within measurement error (2–3%) of unity, while simultaneously maintaining the shape, size, and colloidal stability. Additionally, the luminescence decay kinetics transform from multiexponential decays typical of nanocrystalline semiconductors with a distribution of trap sites, to a monoexponential decay, typical of single energy level emitters. Thiocyanate only needs to access a limited number of CsPbBr 3 nanocrystal surface sites, likely representing under-coordinated lead atoms on the surface, in order to have this effect.
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Cited by
Genesis, challenges and opportunities for colloidal lead halide perovskite nanocrystals
Akkerman, Q. A., Rainò, G., Kovalenko, M. V., & Manna, L. (2018) · Nature Materials · doi:10.1038/s41563-018-0018-4 · Cited by 2,287
Krieg, F., Ochsenbein, S. T., Yakunin, S., ten Brinck, S., Aellen, P., Süess, A., Clerc, B., Guggisberg, D., Nazarenko, O., Shynkarenko, Y., et al. (2018) · ACS Energy Letters · doi:10.1021/acsenergylett.8b00035 · Cited by 893
Dong, Y., Qiao, T., Kim, D., Parobek, D., Rossi, D., & Son, D. H. (2018) · Nano Letters · doi:10.1021/acs.nanolett.8b00861 · Cited by 580
Low‐Dimensional Metal Halide Perovskite Photodetectors
Wang, H., Li, S., Liu, X., Shi, Z., Fang, X., & He, J. (2021) · Advanced Materials · doi:10.1002/adma.202003309 · Cited by 574
Ban, M., Zou, Y., Rivett, J. P. H., Yang, Y., Thomas, T. H., Tan, Y., Song, T., Gao, X., Credgington, D., Deschler, F., et al. (2018) · Nature Communications · doi:10.1038/s41467-018-06425-5 · Cited by 490
Metadata
- Authors
- Koscher, B. A., Swabeck, J. K., Bronstein, N. D., & Alivisatos, A. P.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2017-05-04
- Volume
- 139
- Issue
- 19
- Pages
- 6566-6569
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2608431451
- Cited by
- 844
- References
- 0
- FWCI
- 40.65
- Type
- journal article
- Language
- en
- Open access
- closed
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- Koscher, B. A., Swabeck, J. K., Bronstein, N. D., & Alivisatos, A. P. (2017). Essentially Trap-Free CsPbBr3 Colloidal Nanocrystals by Postsynthetic Thiocyanate Surface Treatment. Journal of the American Chemical Society. https://doi.org/10.1021/jacs.7b02817
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