Aluminum distearate-modified cspbx3 (x = i, br, or cl/br) nanocrystals with enhanced optical and structural stabilities

Abstract

Colloidal all-inorganic perovskite nanocrystals (PNCs), possessing unique optical properties, have attracted considerable attention in the field of semiconductor nanocrystals (NCs), but their application is hindered by the stability issue resulting partly from dynamic capping ligand binding. Herein, we report a simple method for the synthesis of all-inorganic cesium lead-based (CsPbX3) NCs with enhanced structural stability and photoluminescence quantum yield. Aluminum distearate (AlDS) was introduced into the preparation of CsPbX3 NCs, on the basis that the surface defects of CsPbX3 NCs are passivated to form a protective layer on the CsPbX3 NC surface simultaneously. Benefiting from surface modification, the resistance of the CsPbX3 NC dispersion against ethanol, ultraviolet irradiation, and heat treatment was enhanced effectively. Moreover, the photoluminescence intensity and stability of the AlDS-modified NC-based films displayed functional superiority to those of pristine NC-based films.