Effective Surface Washing of All Inorganic Perovskite Nanocrystals to Enhance Optoelectronic Properties

Abstract

All inorganic perovskite colloidal nano crystals are an emerging class of optoelectronic materials. However, their colloidal and structural stability during isolation and washing are major hurdles for their commercial application. Their intrinsic chemical instability and optical stability are directly related to the bonding nature of the nanocrystals’ surface and organic capping agents that passivate the surface of nanocrystals. We studied the surface ligand properties of CsPbBr3 prepared by the conventional hot injection method and their washing with varying polarity antisolvent. We observed changes in electrical and optical properties through experimental studies. The study was mainly done by optical and electronic measurements. We determined a facile nanocrystal washing protocol and observed a considerable improvement in the optoelectronic properties of the all-inorganic perovskite colloidal nanocrystals.

Keywords

• nanocrystals
• hot injection
• inorganic perovskite
• surface ligands
• NC washing