In Situ Formation of Zwitterionic Ligands: Changing the Passivation Paradigms of CsPbBr<sub>3</sub> Nanocrystals
Roberto Grisorio, Francesca Fasulo, Ana B. Muñoz‐García, Michele Pavone, Daniele Conelli, Elisabetta Fanizza, Marinella Striccoli, Ignazio Allegretta, Roberto Terzano, Nicola Margiotta, Paola Vivo, Gian Paolo Suranna
Abstract
NCs become insoluble in nonpolar hexane, with which they can be washed and purified, and form stable colloidal solutions in a relatively polar medium (dichloromethane), even when longly exposed to ambient conditions. The improved NC stability stems from the effective bidentate adsorption of the zwitterionic ligand on the perovskite surfaces, as supported by theoretical investigations. Furthermore, the bidentate functionalization of the zwitterionic ligand enables the obtainment of blue-emitting perovskite NCs with high PLQYs by UV-irradiation in dichloromethane, functioning as the photoinduced chlorine source.