銅鋅錫硫納米結構的制備、相變與光電性能研究
[Abstract]:Copper, zinc, tin and sulfur (Cu_2ZnSnS_4, CZTS) have good development potential in the application of next generation solar cells as absorbent layer materials. This material has suitable band gap (1.5 EV), high absorption coefficient (104cm-1) in visible region, and phase transition characteristic. Its components are abundant in the crust, non-toxic and environmentally friendly. However, the preparation of semiconductor nanostructures of CZTS and related polycompounds is usually carried out by high-temperature colloidal solution method, which involves the use of organic solvents or long-chain organic molecules, which is expensive and pollutes the environment. Therefore, it is of great significance to develop green methods to synthesize CZTS nanostructures and control their morphology and phase. In this thesis, we developed a green hydrothermal method to prepare CZTS and Cu_2SnS_3 (CTS) nanostructures, and systematically studied their optical and optical properties. The main results are as follows: (1) Hexagonal wurtzite CZTS nanocrystals were prepared by a top-down method for the first time. The method does not use any organic solvent. CZTS nanocrystalline is formed by the reaction of Cu_2O nanometers with Sn-MCC complex aqueous solution and Zn~ (2) ion aqueous solution. The size of nanocrystalline is 5 鹵2 nm.. The results show that the formation process of CZTS nanocrystalline CZTS is due to the effect of "Kokkendal effect", and the formation process has experienced the evolution of CZTS nanocrystalline crystal. The formation of CZTS nanocrystals is the effect of acid etching. The pH value of the growth solution has an important influence on the crystal phase of the formed CZTS, and the neutral solution is favorable to the formation of hexagonal wurtzite structure CZTS, alkaline solution and the tetragonal sphalerite structure CZTS.. The synthesized hexagonal wurtzite CZTS nanocrystals have significant photoluminescence and photoelectric effects. (2) the hexagonal CTS nanobox was prepared by the reaction of Cu_2O nanobircle with Sn-MCC complex aqueous solution for the first time, and its formation process experienced Cu_2O Cu_2-xS Cu_2-xS CuS CTS. (2) Hexagonal CTS nanobox was prepared by the reaction of Cu_2O nanobircle with Sn-MCC complex aqueous solution for the first time in the field of low-cost solar cells. The nanobox was formed as a result of the Kokkendal effect. After annealing, the hexagonal CTS nanobox will be transformed into tetragonal CTS nanobox. The optical properties show that the band gap of hexagonal CTS nanobox and tetragonal CTS nano-box are 1.4 and 1.2 eV., respectively. The photochemical properties of CTS nanobox have been studied in detail. It is shown that CTS nanobox has a good development in the production of hydrogen by photolysis of water.
【學位授予單位】:合肥工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TN304;TB383.1
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