表面微观结构对透光光程变化影响的研究

发布时间：2018-01-07 19:31

本文关键词：表面微观结构对透光光程变化影响的研究　出处：《安徽工程大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来研究发现表面微观结构可以引起光波在材料中传播光程的改变,对反射、透光率与雾度率等光学特性有显著的影响,并可以提高光学器件的效益。目前,表面织构对光学性能的影响研究比较成熟的是湿化学法及光刻蚀法；表面织构的材料以半导体和硅为主。由于半导体薄膜的尺寸限制,其表面织构是纳米和亚微米,湿化学刻蚀也会造腐蚀空洞及不均匀的缺陷出现；硅的表面织构工艺难度,没有达到大面积的应用。为了获得更丰富的织构形貌及织构材料的选用,本文采用液相转写法制备仿植物叶子表面结构的有机玻璃,研究其光学性能及光学器件效益。采用模板法复制高光和作用的植物叶子表面微观结构,具体工艺为：将聚二甲基硅氧烷浇注在植物叶子表面,得到具有反结构的聚二甲基硅氧烷(PDMS)的模板,再利用高透明有机材料(聚甲基丙烯酸甲酯)进行复制植物叶子表面纹理,优化仿植物叶子有机玻璃的制备工艺,研究其对透光率、雾度率及散光度等光学特性的影响,研究仿植物叶子有机玻璃薄膜对光电效益的影响,采用SEM、AFM等表征仿生薄膜的表面结构形貌,模拟计算光波在仿生薄膜中的转播路线、光学特性,建立仿生表面织构特征与光学性能之间的关系,探索仿生薄膜的光学机理。结果表明：聚二甲基硅氧烷(PDMS)与固化剂按10：1的配比,且以温度为70。烘干4小时能够达到比较理想的固化度效果,获得对植物叶子表面复制度高的PDMS反模。为了避免在剥落时破坏薄膜表面结构,采用氟硅烷对反模进行低表面能的修饰,以达到降低界面间黏附力的目的,这样再进行第二次复制时便可轻松的剥离两种材料而不损伤其表面结构；为了使PDMS能够浸入到反模的微细缝隙里,在制备薄膜的过程中利用真空提高薄膜溶液的填充能力。获得的仿植物叶子表面结构的薄膜具有高透光性及高雾度率,其透光率大于85%,且雾度也能够达到70%；对具有仿生结构薄膜的太阳能电池进行光电效应测试,结果表明：仿生薄膜可以提高太阳能电池的光电效应,与没有仿生薄膜的太阳能电池相比较,其光电效应能够提高8%以上。设计了激光点光源的光散射实验装置,点光源分别通过仿生薄膜和光滑薄膜,拍摄两种薄膜的散光率,结果表明：仿生薄膜的散光角度达到20°以上,而光滑薄膜的光散几乎没有改变,证明仿生薄膜的表面结构完成改变了光路光程,光路光程的变化是其光学特性和光电效益提高的主要原因。将仿生薄膜表面结构进行抽象、模型化、建立几何模型,并对具有代表性的圆锥形、圆形、三角形的第一级织构,第一级织构分布100-500nm级短棒状、小圆点的分级织构进行模拟计算,结果表明：仿生薄膜的分级织构具有更低的反光率、高的透光率；纳米结构在光照射的情况下出现衍射现象,这是光通过仿生薄膜时产生光散射现象和提高光学效应的主要原因。
[Abstract]:Recent studies have found that the surface microstructure can be caused by the light propagation path in the material change, on reflection, have significant influence on optical properties of light transmittance and haze rate, and can improve the optical efficiency. At present, the surface texture effects on the optical properties of more mature is the wet chemical method and photolithography method; surface texture of materials to the semiconductor and silicon. Due to size limitations of semiconductor thin films, the surface texture is nano and submicron, wet chemical etching will be made void and uneven corrosion defects; difficult surface texture process for silicon, did not reach the application in large area. In order to obtain more abundant selection of texture morphology the material and texture, the preparation of organic glass surface structure imitation plant leaves by liquid phase transfer, study its optical properties and optical devices and high light efficiency. Replication by template method The microscopic structure of the leaf surface effect, the specific process is: two polydimethylsiloxane pouring on the surface of plant leaves, with two polydimethylsiloxane (PDMS) anti structure template with high transparent organic materials (PMMA) to replicate the leaf surface texture, optimization of preparation technology of organic glass imitation plant leaves and on the transmittance and optical characteristics of the haze rate and astigmatism, influence of imitated leaf organic glass films on the photoelectric efficiency by SEM, the surface structure of AFM thin film characterization of bionic morphology, optical properties of light in the simulation of bionic thin film on the line, and establish the relationship between the surface texture bionic characteristics and optical properties, optical mechanism of bionic thin film. The results showed that two polydimethylsiloxane (PDMS) and curing agent according to the ratio of 10:1, and according to the temperature 70. drying 4 hours to be able to achieve the ideal effect of curing degree, get on the leaf surface PDMS high degree of anti copy mode. In order to avoid the destruction of the surface structure in the film peeling, by fluorine silane modified low surface energy on anti mold, in order to reduce the adhesion of the interface, then peel second when you can easily copy the two materials without damaging its surface structure; in order to make PDMS be immersed into the micro cracks in the anti mold, improve the filling ability of film solution by vacuum in the process of preparing the film. The film imitation plant leaves surface structure obtained with high light transmittance and high haze the rate of light transmittance is greater than 85%, and the haze can reach 70%; photoelectric effect test of solar cell with bionic structure thin film. The results showed that the bionic film can improve the photoelectric effect of solar cell, Compared with the solar cell without biomimetic film, can the photoelectric effect is improved by more than 8%. The light scattering experimental device of laser point source design, point source respectively by biomimetic films and smooth film, shooting two astigmatism rate of the film, the results show that the scattered light angle of bionic films over 20 degrees, and a smooth film the light scattered almost no change, the surface structure of bionic proof of completion of the film changes the light path, light path change is the main reason for the increase of the optical properties and optical efficiency. The surface structure of bionic film abstraction, model, geometric model is built, and the representative of conical, round, triangle the first level of first class texture, texture distribution of 100-500nm short rod, grading texture dots are simulated, the results show that the reflection rate of grade film has lower bionic texture, high The transmittance of the nanostructure appears under the irradiation of light, which is the main reason for the light scattering phenomenon and the enhancement of optical effect when the light is passing through biomimetic thin films.

【学位授予单位】：安徽工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB391

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