水热法制备铜锌锡硫及其性能的研究
发布时间：2018-07-13 18:55
【摘要】：伴随着工业的繁荣发展,各种环境问题以及能源危机现实都摆在人们的面前,这迫切需要探索工业、环境、能源之间的可持续发展模式。作为一种妥善解决环境污染问题的途径,半导体光催化技术能够利用清洁无污染、取之不尽的太阳能,在较为温和的条件下,将废水中的有机污染物彻底分解。这种技术避免了对环境造成次生灾害,同时光催化技术具有绿色、低成本等优点,所以逐渐受到工业发展的重视。由于光伏材料的最佳禁带宽度与化合物Cu2ZnSnS4(CZTS)的固有禁带宽度非常相似,并具有较大的吸收系数,另外其组成元素丰富、无毒,因而在薄膜太阳能电池吸收层领域、光催化反应领域都有着广阔的应用前景。本课题从CZTS化合物的制备合成与性能特点等方面进行探究。主要工作如下:(1)CZTS粉末的制备与表征。采用水热法,选取PVP作为制备过程的表面活性剂,从CN2H4S(硫脲)、CuCl2、ZnCl2、SnCl4四种原料中合成提取CZTS粉末,同时观察反应条件中温度和PVP含量对CZTS产物外观和结构的影响。借助于XRD、SEM、EDS及UV-Vis等途径来对CZTS进行质量及微观结构上的表征。从结果中发现:具有良好结晶性的CZTS粉末,呈现出锌黄锡矿结构时能较好的响应可见光,它的光学带隙是1.49 eV。(2)CZTS粉末光催化性能的研究。模拟废水处理过程,采用罗丹明B溶液为目标对象,在可见光照射环境下测试CZTS粉末的光催化特性。数据显示:CZTS在可见光环境中有很好的催化特性,5小时催化反应时间下,罗丹明溶液中RhB的降解率高达70.75%。(3)CZTS薄膜的制备及其光电性能实验研究。采用水热法在FTO玻璃衬底上沉积CZTS薄膜,之后对样品进行物相鉴定、形貌分析及线性I-V曲线的测试。结果表明CZTS薄膜是由均匀且致密的球体状粒子所组成,薄膜的禁带宽度为1.51 e V,在光照的条件比在黑暗条件下展现出更低的电阻率。
[Abstract]:With the prosperity and development of industry, all kinds of environmental problems and energy crisis are facing people. It is urgent to explore the sustainable development model between industry, environment and energy. As a way to solve the problem of environmental pollution, semiconductor photocatalytic technology can make use of clean and unpolluted and inexhaustible solar energy. Under mild conditions, the organic pollutants in the wastewater are thoroughly decomposed. This technology avoids the secondary disasters to the environment, has the advantages of green and low cost with time catalysis technology, so it is gradually paid attention to industrial development. Due to the best band gap of photovoltaic materials and the inherent forbidden bandwidth of compound Cu2ZnSnS4 (CZTS) The degree is very similar and has a large absorption coefficient, and the other components are rich and non-toxic. Therefore, in the field of absorption layer of thin film solar cells, the field of photocatalytic reaction has a broad application prospect. This topic is explored from the preparation and properties of CZTS compounds and properties. The main work is as follows: (1) preparation of (1) CZTS powder By using hydrothermal method, PVP was selected as the surface active agent in the preparation process, and CZTS powder was synthesized from four kinds of raw materials, CN2H4S (thiourea), CuCl2, ZnCl2, SnCl4, and the effect of temperature and PVP content on the appearance and structure of CZTS products in the reaction conditions. The quality and microcosmic were carried out by means of XRD, SEM, EDS and UV-Vis. Structural characterization. It is found from the results that good crystalline CZTS powder can respond to visible light in a zinc yellow tin structure, and its optical band gap is a study of the photocatalytic performance of 1.49 eV. (2) CZTS powder. The simulated wastewater treatment process is targeted by Luo Danming B solution, and CZTS is tested under visible light irradiation environment. The photocatalytic properties of the powder show that CZTS has good catalytic properties in the visible light environment. In the 5 hour catalytic reaction time, the degradation rate of RhB in Luo Danming solution is up to the preparation of 70.75%. (3) CZTS film and the experimental study of its photoelectric properties. The CZTS film is deposited on the FTO glass substrate by hydrothermal method. The results show that the CZTS thin film is composed of uniform and compact spheroid particles, and the band gap of the film is 1.51 e V, and the light condition shows a lower resistivity than in the dark condition.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;O643.36
[Abstract]:With the prosperity and development of industry, all kinds of environmental problems and energy crisis are facing people. It is urgent to explore the sustainable development model between industry, environment and energy. As a way to solve the problem of environmental pollution, semiconductor photocatalytic technology can make use of clean and unpolluted and inexhaustible solar energy. Under mild conditions, the organic pollutants in the wastewater are thoroughly decomposed. This technology avoids the secondary disasters to the environment, has the advantages of green and low cost with time catalysis technology, so it is gradually paid attention to industrial development. Due to the best band gap of photovoltaic materials and the inherent forbidden bandwidth of compound Cu2ZnSnS4 (CZTS) The degree is very similar and has a large absorption coefficient, and the other components are rich and non-toxic. Therefore, in the field of absorption layer of thin film solar cells, the field of photocatalytic reaction has a broad application prospect. This topic is explored from the preparation and properties of CZTS compounds and properties. The main work is as follows: (1) preparation of (1) CZTS powder By using hydrothermal method, PVP was selected as the surface active agent in the preparation process, and CZTS powder was synthesized from four kinds of raw materials, CN2H4S (thiourea), CuCl2, ZnCl2, SnCl4, and the effect of temperature and PVP content on the appearance and structure of CZTS products in the reaction conditions. The quality and microcosmic were carried out by means of XRD, SEM, EDS and UV-Vis. Structural characterization. It is found from the results that good crystalline CZTS powder can respond to visible light in a zinc yellow tin structure, and its optical band gap is a study of the photocatalytic performance of 1.49 eV. (2) CZTS powder. The simulated wastewater treatment process is targeted by Luo Danming B solution, and CZTS is tested under visible light irradiation environment. The photocatalytic properties of the powder show that CZTS has good catalytic properties in the visible light environment. In the 5 hour catalytic reaction time, the degradation rate of RhB in Luo Danming solution is up to the preparation of 70.75%. (3) CZTS film and the experimental study of its photoelectric properties. The CZTS film is deposited on the FTO glass substrate by hydrothermal method. The results show that the CZTS thin film is composed of uniform and compact spheroid particles, and the band gap of the film is 1.51 e V, and the light condition shows a lower resistivity than in the dark condition.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;O643.36
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