Skip to main content Light Absorption Coefficient of CsPbBr3 Perovskite Nanocrystals Date Issued 2018-06-07 Author(s) Maes, Jorick Balcaen, Lieve Drijvers, Emile Zhao, Qiang De Roo, Jonathan Vantomme, André Vanhaecke, Frank Geiregat, Pieter Hens, Zeger DOI 10.1021/acs.jpclett.8b01065 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. Show more