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Maes, Jorick; Balcaen, Lieve; Drijvers, Emile; Zhao, Qiang; De Roo, Jonathan; Vantomme, André; Vanhaecke, Frank; Geiregat, Pieter; Hens, Zeger
The journal of physical chemistry letters, 06/2018, Volume: 9, Issue: 11Journal Article
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 μi 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, μi 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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