Photoluminescence Properties of CsPbCl₃ and CsPbBr₃ Nanocrystals synthesized by LARP Method with Various Ligands and Anti-solvents

Abstract

Cesium lead halide (CsPbX3; X= Cl, Br, I) is inorganic materials that can be used for the absorber of Perovskite solar cell and active layer of sensor. In this research, synthesis of cesium lead chloride (CsPbCl3) utilizes cesium chloride (CsCl) and lead (II) chloride (PbCl2) as raw materials then oleic acid and linoleic acid are used as ligands. CsCl and PbCl2 can be utilized to synthesize CsPbCl3 by using ligand-assisted reprecipitation (LARP) method at room temperature. Dimethyl Sulfoxide (DMSO) is used as the solvent of CsCl and PbCl2 to form 0.1 M solution. Similar to CsPbCl3, synthesis of CsPbBr3utilizes CsBr and PbBr2 at room temperature. Antisolvent used in this experiment are chloroform, toluene and tetrahydrofuran (THF) for colloidal solution CsPbCl3 and CsPbBr3. This research will analyze the impact of different ligands and different antisolvent, so it will be obtained the most suitable ligand and antisolvent for CsPbCl3 and CsPbBr3. The wavelength of photoluminescence spectra for samples of CsPbCl3 and CsPbBr3 colloidal solution are 434.00 nm and 512.82 nm. Based on transmission electron microscope (TEM) results, nanocrystals have been formed in samples of CsPbCl3 and CsPbBr3 colloidal solution. Powder samples of CsPbCl3 and CsPbBr3 can be obtained by heating at 190°C (the boiling point of DMSO) then CsPbCl3 and CsPbBr3 are identified in each powder sample by x-ray diffraction (XRD).