Journal
ACS NANO
Volume 10, Issue 2, Pages 2071-2081Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b06295
Keywords
NMR; CsPbBr3; absorption coefficient; surface chemistry
Categories
Funding
- FWO (Research Foundation Flanders)
- European Comission via Marie-Sklodowska Curie action Phonsi [H2020-MSCA-ITN-642656]
- FWO-Vlaanderen [G.0760.12]
- Belgian Science Policy office [IAP 7.35]
- Ghent University [GOA 01G01513]
- AGAUR
Ask authors/readers for more resources
Lead halide perovskite materials have attracted significant attention in the context of photovoltaics and other optoelectronic applications, and recently, research efforts have been directed to nanostructured lead halide perovskites. Collodial nanocrystals (NCs) of cesium lead halides (CsPbX3, X = Cl, Br, I) exhibit bright photoluminescence, with emission tunable over the entire visible spectral region. However, previous studies on CsPbX3 NCs did not address key aspects of their chemistry and photophysics such as surface chemistry and quantitative light absorption. Here, we elaborate on the synthesis of CsPbBr3 NCs and their surface chemistry. In addition, the intrinsic absorption coefficient was determined experimentally by combining elemental analysis with accurate optical absorption measurements. H-1 solution nuclear magnetic resonance spectroscopy was used to characterize sample purity, elucidate the surface chemistry, and evaluate the influence of purification methods on the surface composition. We find that ligand binding to the NC surface is highly dynamic, and therefore, ligands are easily lost during the isolation and purification procedures. However, when a small amount of both oleic acid and oleylamine is added, the NCs can be purified, maintaining optical, colloidal, and material integrity. In addition, we find that a high amine content in the ligand shell increases the quantum yield due to the improved binding of the carboxylic acid.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available