Insights into the interparticle mixing of CsPbBr₃ and CsPbI₃ nanocubes: halide ion migration and kinetics

Abstract

Anion exchange of CsPbX3 nanocrystals (NCs) is an easy pathway to tune the bandgap over the entire visible region. Even, mixing of pre-synthesized CsPbBr3 and CsPbI3 NCs at room temperature...

Showerhead-assisted chemical vapor deposition of CsPbBr3 films for LED applications

“…Both samples feature comparable peak extinction coefficients ranging from 2.2 × 10 4 to 2.4 × 10 4 cm −1 (Fig. 6a), which are consistent with literature data [43]. Thus, differences in the absolute PL intensities cannot be correlated to a distinctive absorption behavior.…”

Ligands Mediate Anion Exchange between Colloidal Lead-Halide Perovskite Nanocrystals

“…The working hypothesis for the reaction mechanism is that the NC surface ligands shuttle the anions in the cross-exchange reaction. While earlier reports already suggested this, 22,30 a clear experimental proof is warranted to rule out the possibility of a reaction through a direct collision between the NCs.…”

“…19 A decrease in the rate of the reaction upon addition of excess ligands to the solution was reported. 21 Only a few studies focused on the kinetics of cross-anion exchange in NCs, 22 and a complete mechanism has yet to be derived.…”

Improving optical properties of blue emission perovskite by plasmonic enhancement

“…One of them is to use mixed halide Cl/Br-based perovskites, the other is to use only quantum dimension effect in Br-based nanocrystals [8,9] . Whereas, ion migration of mixed halogen perovskites cannot be ignored due to their high ionicity [10,11] , therefore, the quantum-confined Br-based perovskites more suitable for blue emission [12] . Despite high defect tolerance of perovskite materials, surface defects and grain boundaries(GB) in perovskite materials are deep level defects [13] , which play a crucial role in carrier transport and non-radiative recombination [14] .…”