SYNTHESIS and CHARACTERISATION of TRYPTOPHAN MEDIATED LEAD HALIDE PEROVSKITE NANOCRYSTALS

Abstract

Lead halide perovskites has gained achievements due to its outstanding optoelectronic properties. Despite gaining tremendous attention, this material has some shortcoming. The presence of heavy metals like Lead, which is toxic, and this material tends to degrade in the presence of air, light, and water. Herein, we report on amino acid (Trp)-mediated synthesis of CsPbBr3 perovskite nanocrystals (NCs). Tryptophan is a hydrophobic amino acid to promote the formation of CsPbBr3 NCs. The use of Trp derivatives for CsPbBr3 nanocrystal synthesis indicates that the carboxyl group, amine group, and indole ring of Trp act synergistically on CsPbBr3 nanoparticle formation. The compound is characterized by powder X-ray diffraction (PXRD), field emission-scanning electron microscopy (FE-SEM), UV-DRS (Differential reflectance spectroscopy), photoluminescence spectroscopy (PL), Fourier-transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and TGA (Thermogravimetric analysis).