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. 2018 Jun 7;9(11):3093-3097.
doi: 10.1021/acs.jpclett.8b01065. Epub 2018 May 24.

Light Absorption Coefficient of CsPbBr3 Perovskite Nanocrystals

Jorick Maes  1   2 , Lieve Balcaen  3 , Emile Drijvers  1   2 , Qiang Zhao  4 , Jonathan De Roo  1   5 , André Vantomme  4 , Frank Vanhaecke  3 , Pieter Geiregat  1   2 , Zeger Hens  1   2
Affiliations

Light Absorption Coefficient of CsPbBr3 Perovskite Nanocrystals

Jorick Maes et al. J Phys Chem Lett. .

Abstract

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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