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 (CH3NH3PbI3; 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.
Highlights
Publisher’s Note: MDPI stays neutralLead halide perovskite materials have attracted much attention in the past few years [1,2,3]because of their unique properties, such as low cost, the application of luminescent materials and their application in the field of optoelectronics [3,4]
Because of the above deficiencies, some literature has reported that the moisture/thermal stability and the optical properties of perovskite MAPbI3 films would be greatly improved by doping inorganic quantum dots [9,10,11]
3, the inorganic because its reaction product is a colloidal dispersion which is easy to expand by spin the MAPbI3 solution and controlling the annealing temperature, it can enhance the stacoating
Summary
Lead halide perovskite materials have attracted much attention in the past few years [1,2,3]. MAPbI3 cannot be stored in the air for a long time because of its hygroscopicity of methylammonium (MA) cations and poor thermal stability [8]. This result will affect the efficiency of organic perovskite solar cells. Present, the synthesis of QDs is based on various methods, including hot injection, the annealing temperature and time areultrasonication the key factors the synthesis. Crystalli-In our ligand-assisted reprecipitation (LARP), andaffecting solvothermal zation, performance morphology of the PQD film [16].dot. 3 , the inorganic because its reaction product is a colloidal dispersion which is easy to expand by spin the MAPbI3 solution and controlling the annealing temperature, it can enhance the stacoating. By adding CsPbI3 PQD into the MAPbI3 solution and controlling
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