Synthesis And Characterization Of Organic-inorganic Hybird Perovskite Structures

Organic-inorganic hybrid perovskite materials combine the advantage of organic and inorganic materials in the molecular scale,which has shown increasingly rapid development in the areas of solar cells,organic light-emitting diodes and lasers.Explorations on the new fabricating methods and new applications of the hybrid perovskite materials have attracted more and more attentions in recent years.In this thesis we mainly focus our work on the fabrication and characterization of the organic-inorganic hybrid perovskite materials,and have obtained the following results:1)We provided a new reprecipitation method to acquire the organic-inorganic hybrid perovskite materials.By optimizing the polarity of the solvent and adding the crystal preventing agent,we successfully obtained the organic-inorganic hybrid perovskite materials with high fluorescent quantum yield in low cost.2)We characterized the photo-physical properties of the green and red emitting CH₃NH₃PbX₃/PVDF composite films by a femtosecond pump-probe system.The results shown that the composite films have stimulated radiation and two-photon absorption properties which indicate that the CH₃NH₃PbX₃/PVDF composite has the potential to be a laser material.We then transfered the solution processed metallic photonic crystals to the surface of the composite film to investigate its application in the distributed feedback lasers.3)We assembled the gold nanoclusters into surface-enhanced Raman scattering?SERS?substrates consisting of randomly distributed gold-nanoislands.We found that the assembling process was slow and can be finely controlled as the annealing temperature was in the range of 150-220oC.This work provided a fundamental rout for controllable fabricating the high quality SERS substrates.