Essentially Trap-Free CsPbBr 3 Colloidal Nanocrystals by Postsynthetic Thiocyanate Surface Treatment
Lawrence Berkeley National Laboratory · Kavli Energy NanoScience Institute · +1 more institution
Abstract
We demonstrate postsynthetic modification of CsPbBr3 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 CsPbBr3 nanocrystal surface sites, likely representing under-coordinated lead atoms on the…
Citation impact
- FWCI
- 52.47
- Percentile
- 100%
- References
- 36
Authors
4- BABrent A. KoscherCorresponding
Lawrence Berkeley National Laboratory, Kavli Energy NanoScience Institute, University of California, Berkeley
- JKJoseph K. Swabeck
Lawrence Berkeley National Laboratory, Kavli Energy NanoScience Institute, University of California, Berkeley
- NDNoah D. Bronstein
Lawrence Berkeley National Laboratory, Kavli Energy NanoScience Institute, University of California, Berkeley
- APA. Paul Alivisatos
Lawrence Berkeley National Laboratory, Kavli Energy NanoScience Institute, University of California, Berkeley
Topics & keywords
- Chemistry
- Colloid
- Thiocyanate
- Trap (plumbing)
- Nanocrystal
- Chemical engineering
- Nanotechnology
- Inorganic chemistry
- Affordable and clean energy