氧化锌纳米颗粒及其异质结构表面光伏特性

发布时间：2018-01-08 17:23

本文关键词：氧化锌纳米颗粒及其异质结构表面光伏特性　出处：《河南大学》2015年硕士论文　论文类型：学位论文

【摘要】：氧化锌(Zn O)因其优越的光电特性,得到了人们越来越多的关注,人们在Zn O的生长机理,形貌调控和发光机制方面有了很多的理论研究,伴随着Zn O材料尺寸的降低,人们的研究重点从宏观区域转移到了微纳区域。Zn O纳米颗粒越来越多的受到了人们的关注,人们利用其优异的特性制备了许多光电器件例如太阳能电池、LED以及传感器等。Cd Se量子点和有机聚合物在太阳能转换、照明、显示技术和生物标记等领域都有潜在的应用前景。在相同的条件下,Zn O纳米颗粒和Cd Se量子点以及有机聚合物的异质结构通常要比单独的纳米光电材料具有更加优越的光学性能和电子传输能力,因此我们有必要了解Zn O纳米颗粒及其异质结构的表面和界面光电特性,对于我们设计和制备新型纳米光电子器件具有重要的意义。在本文中,我们通过表面光伏技术—Kelvin探针探究了Zn O纳米颗粒及其异质结构的表面光伏特性。主要内容如下:1、以醋酸锌、四甲基氢氧化铵和二甲基亚砜为主要原料,采用溶胶-凝胶法制备Zn O纳米颗粒,利用透射电子显微镜,X射线衍射仪和光致发光谱对样品进行表征,结果表明Zn O纳米颗粒为纤锌矿结构,粒径尺寸不均一。光致发光谱能够观察到可见光发光特性,表明Zn O纳米颗粒存在较多的缺陷态。在ITO基底上旋涂Zn O纳米颗粒,再利用Kelvin探针技术结合光谱仪,探究Zn O纳米颗粒在不同实验条件下的表面光伏特性。2、利用液相高温热注入方法,制备Cd Se量子点,利用透射电镜,紫外荧光吸收对样品进行表征,结果表明Cd Se量子点粒径尺寸均一,随着反应时间的增加,粒径的尺寸增大,吸收峰红移。结合制备的Zn O纳米颗粒,制备Zn O/Cd Se异质结构,基于Kelvin探针的表面光伏技术用于探究其异质结构的表面光伏特性。3、利用前面合成的Zn O纳米颗粒,结合P3AT(聚-3十二烷基噻吩)经过旋涂制备异质异质结构,利用Kelvin探针研究异质结构的表面光伏特性,通过改变P3AT的浓度,发现异质结构界面态随着浓度的增加而增加。改变不同的退火温度,在P3AT吸收光子范围内,光伏起始峰位随着温度改变而改变。
[Abstract]:Zinc oxide (ZnO) has attracted more and more attention due to its excellent photoelectric properties. There have been many theoretical studies on the growth mechanism, morphology regulation and luminescence mechanism of ZnO. With the decrease of Zno material size, people pay more and more attention to the research focus from macroscopic region to micro-nano region. Many photovoltaic devices, such as solar cell LED and sensors, have been fabricated by using their excellent properties. CD se quantum dots and organic polymers have been converted and illuminated in solar energy. Display techniques and biomarkers have potential applications. Under the same conditions. The heterostructures of ZnO nanoparticles, CD se quantum dots and organic polymers usually have better optical properties and electron transport ability than the single nano-optoelectronic materials. Therefore, it is necessary to understand the surface and interface optoelectronic properties of Zno nanoparticles and their heterostructures, which is of great significance for the design and fabrication of novel nano-optoelectronic devices. The surface photovoltaic properties of Zno nanoparticles and their heterostructures were investigated by using the surface photovoltaic technique-Kelvin probe. The main contents are as follows: 1, zinc acetate. ZnO nanoparticles were prepared by sol-gel method with tetramethyl ammonium hydroxide and dimethyl sulfoxide as main raw materials. The samples were characterized by transmission electron microscopy (TEM) X-ray diffraction and photoluminescence spectroscopy. The results show that the Zno nanoparticles are wurtzite structure and the size is not uniform. The visible luminescence characteristics can be observed by photoluminescence spectra. The results show that there are many defects in Zno nanoparticles. The Zno nanoparticles are spin-coated on the ITO substrate, and then the Kelvin probe technique is used to combine with the spectrometer. The surface photovoltaic properties of ZnO nanoparticles under different experimental conditions were investigated. CD se quantum dots were prepared by liquid phase high temperature thermal injection and transmission electron microscopy (TEM) was used. The results show that the particle size of CD se quantum dots is uniform and the size increases with the increase of reaction time. The ZnO / CD se heterostructure was prepared by combining the ZnO nanoparticles with the red shift of absorption peak. The surface photovoltaic technology based on Kelvin probe is used to study the surface photovoltaic properties of the heterostructure. Heterostructures were prepared by spin coating with P3AT (poly-12 alkyl thiophene). The surface photovoltaic properties of the heterostructures were studied by Kelvin probe, and the concentration of P3AT was changed. It is found that the interface states of the heterostructure increase with the increase of concentration, and the initial photovoltaic peak position changes with the change of temperature in the range of P3AT absorption photons by changing the annealing temperature.
【学位授予单位】：河南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

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