Study On The Synthesis And Optical Properties Of Ⅰ-Ⅲ-Ⅵ₂ Chalcogenides Semiconductor Nanocrystals

In recent years, Ⅰ-Ⅲ-Ⅵ₂ chalcogenides semiconductor nanocrystals have attacted more and more attention and research due to their unique optical and electrical properties. Development and design relatively simple, green and generic colloidal chemical synthetic strategy to prepare high-quality Ⅰ-Ⅲ-Ⅵ₂ chalcogenides semiconductor nanocrystals with different phase structures, size and morphology are very significance for such materials to further develop their new research systems and application for more fields.Monodisperse chalcopyrite Cu In Se2 nanocrystals with a trigonal-pyramidal shape were synthesized by a facile hot-injection method. The morphology could be tuned by changing the injection temperature. The reason for the morphological evolution could be that the injection temperature affects the crystals nucleus, and further affects the effect of OAm on the growth rate along the different directions, which realizes the shape evolution. In addition, Cu In Se2 nanocrystals with a spherical shape were also obtained when copper stearate was used as the copper precursor. Because of the binding effect of OAm, an ellipsoidal shape was also obtained when increasing the concentration of OAmWe designed a generic colloidal chemical synthetic strategy to prepare a series of Ag-based Ⅰ-Ⅲ-Ⅵ₂ nanocrystals with metastable structures, including Ag Ga S2,Ag In Se2 and Ag In S2, by using the stearate salt of III elements as the precursors.During the reaction process, all metal stearate salt exhibited excellent solubility and stability in the organic solvent, and could reactive with anion sources rapidly,efficiently and universally. All the as-synthesized Ag-based Ⅰ-Ⅲ-Ⅵ₂ nanocrystals possessed orthorhombic structures with good oil-soluble, monodisperse, highly crystalline and relatively uniform size and morphology. In addition, the Un-vis absorption spectra of the as-synthesized nanocrystals showed a significant blue shift,which is due to the quantum size effect. Applying metal stearate salt to the synthesis technology of Ag-based Ⅰ-Ⅲ-Ⅵ₂ nanocrystals with orthorhombic structures will provide a new synthetic method, and then lay the foundation of the research for their new properties and the practical application in more kinds of fields.