Ligands Mediate Anion Exchange between Colloidal Lead-Halide Perovskite Nanocrystals.

ABSTRACT: The soft lattice of lead-halide perovskite nanocrystals (NCs) allows tuning their optoelectronic characteristics via anion exchange by introducing halide salts to a solution of perovskite NCs. Similarly, cross-anion exchange can occur upon mixing NCs of different perovskite halides. This process, though, is detrimental for applications requiring perovskite NCs with different halides in close proximity. We study the effects of various stabilizing surface ligands on the kinetics of the cross-anion exchange reaction, comparing zwitterionic and ionic ligands. The kinetic analysis, inspired by the "cage effect" for solution reactions, showcases a mechanism where the surface capping ligands act as anion carriers that diffuse to the NC surface, forming an encounter pair enclosed by the surroundin

SUBMITTER: Scharf E 

PROVIDER: S-EPMC9185745 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature