The Annealing Effect at Different Temperatures for Organic-Inorganic Perovskite Quantum Dots

Abstract

After the preparation of inorganic perovskite cesium lead iodide quantum dots (CsPbI3 QD) by ligand-assisted reprecipitation (LARP), CsPbI3 QD was added to the organic perovskite methylamine lead triiodide (CH3 NH3 PbI3; MAPbI3) to successfully form composite perovskite film. To obtain better perovskite quantum dot (PQD) crystal characteristics, this research used different annealing temperatures to discuss the crystallinity changes of perovskite quantum dots (PQD). Through X-ray diffraction (XRD) analysis, it was found that the preferred peak (110) of MAPbI3 had maximum peak intensity when the annealing temperature increased to 120◦ C. Based on the measurement results of PQD’s Ultraviolet-Visible spectrum, it was shown that the maximum absorption area was obtained at the wavelength of 350 nm~750 nm at the annealing temperature 120◦ C. From the scanning electron microscope (SEM) measurement, it was found that the grain size was the largest at the annealing temperature 120◦ C, and the grain size was 60.2 nm. The best crystallization characteristics of PQD were obtained at the annealing temperature 120◦ C.