Light Absorption Coefficient of CsPbBr3 Perovskite Nanocrystals

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 de...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2018-06, Vol.9 (11), p.3093-3097
Main Authors: Maes, Jorick, Balcaen, Lieve, Drijvers, Emile, Zhao, Qiang, De Roo, Jonathan, Vantomme, André, Vanhaecke, Frank, Geiregat, Pieter, Hens, Zeger
Format: Article
Language:English
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Summary: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.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.8b01065