Light absorption coefficient of CsPbBr3 perovskite nanocrystals

Inductively coupled plasma mass spectrometry (ICP-MS) was combined with UVU+2212vis absorption spectroscopy and transmission electron microscopy to determine the size, composition, and intrinsic absorption coefficient U+03BCi 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, U+03BCi 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.

Publication year:2018