Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 9, Issue 11, Pages 3093-3097Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b01065
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Funding
- European Commission [H2020-MSCA-ITN-642656, H2020 MSCA-RISE-691185]
- Research Foundation Flanders [17006602]
- Ghent University (GOA) [01G01513]
- FWO-Vlaanderen [12K8216N]
- IWT-Vlaanderen
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Inductively coupled plasma mass spectrometry (ICP-MS) was combined with UV-vis absorption spectroscopy and transmission electron microscopy to determine the size, composition, and intrinsic absorption coefficient mu(i) of 4 to 11 nm sized colloidal CsPbBr3 nanocrystals (NCs). The ICP-MS measurements demonstrate the nonstoichiometric nature of the NCs, with a systematic excess of lead for all samples studied. Rutherford backscattering measurements indicate that this enrichment in lead concurs with a relative increase in the bromide content. At high photon energies, mu(i) is independent of the nanocrystal size. This allows the nanocrystal concentration in CsPbBr3 nanocolloids to be readily obtained by a combination of absorption spectroscopy and the CsPbBr3 sizing curve.
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