| dc.description.abstract | In this study, we report for the first time the synthesized of perovskite powder by “ water-based process ”. It is not only quite simple at room temperature, but also through the ＂water＂ as a solvent without any high boiling organic solvents and ligands, achieving low-cost, large-area, mass production and environmentally friendly.
CsxPbyBrz powder was obtained by systematically varying the molar ratios of CsBr/Pb(NO3)2 in the deionized water. We used the XRD, SEM and EDS to evaluate the powders CsxPbyBrz crystal structural and chemical composition. Therefore, we combined our experimental observations found that the chemical reaction mechanism is related to “ Solubility equilibrium ” , so that CsBr in the system can reach the saturated state, thereby inhibiting the degradation reaction of CsPbBr3 in water.
In addition, we also use the UV-Vis, UPS and PL spectrum to analysis the optical and electrical properties. The results show that with the increase of CsBr concentration, the influence is gradually changed from indirect energy gap 3.1eV CsPb2Br5 to direct energy gap 2.3eV CsPbBr3. Moreover, the crystal growth mechanism for the water-based process was investigated by TEM analysis.
Finally, our research team successfully applied this powder to single-source evaporation and spray-coated technique, and also prepared various perovskite powders by changing the halogen atoms of CsX, demonstrating the unlimited development potential of this water-based process synthesized perovskite technology.
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