本文關(guān)鍵詞：表面微觀結(jié)構(gòu)對透光光程變化影響的研究　出處：《安徽工程大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 仿植物葉子表面結(jié)構(gòu) 光學性能 光電效應 透光率 霧度 散光度

【摘要】：近年來研究發(fā)現(xiàn)表面微觀結(jié)構(gòu)可以引起光波在材料中傳播光程的改變,對反射、透光率與霧度率等光學特性有顯著的影響,并可以提高光學器件的效益。目前,表面織構(gòu)對光學性能的影響研究比較成熟的是濕化學法及光刻蝕法；表面織構(gòu)的材料以半導體和硅為主。由于半導體薄膜的尺寸限制,其表面織構(gòu)是納米和亞微米,濕化學刻蝕也會造腐蝕空洞及不均勻的缺陷出現(xiàn)；硅的表面織構(gòu)工藝難度,沒有達到大面積的應用。為了獲得更豐富的織構(gòu)形貌及織構(gòu)材料的選用,本文采用液相轉(zhuǎn)寫法制備仿植物葉子表面結(jié)構(gòu)的有機玻璃,研究其光學性能及光學器件效益。采用模板法復制高光和作用的植物葉子表面微觀結(jié)構(gòu),具體工藝為：將聚二甲基硅氧烷澆注在植物葉子表面,得到具有反結(jié)構(gòu)的聚二甲基硅氧烷(PDMS)的模板,再利用高透明有機材料(聚甲基丙烯酸甲酯)進行復制植物葉子表面紋理,優(yōu)化仿植物葉子有機玻璃的制備工藝,研究其對透光率、霧度率及散光度等光學特性的影響,研究仿植物葉子有機玻璃薄膜對光電效益的影響,采用SEM、AFM等表征仿生薄膜的表面結(jié)構(gòu)形貌,模擬計算光波在仿生薄膜中的轉(zhuǎn)播路線、光學特性,建立仿生表面織構(gòu)特征與光學性能之間的關(guān)系,探索仿生薄膜的光學機理。結(jié)果表明：聚二甲基硅氧烷(PDMS)與固化劑按10：1的配比,且以溫度為70。烘干4小時能夠達到比較理想的固化度效果,獲得對植物葉子表面復制度高的PDMS反模。為了避免在剝落時破壞薄膜表面結(jié)構(gòu),采用氟硅烷對反模進行低表面能的修飾,以達到降低界面間黏附力的目的,這樣再進行第二次復制時便可輕松的剝離兩種材料而不損傷其表面結(jié)構(gòu)；為了使PDMS能夠浸入到反模的微細縫隙里,在制備薄膜的過程中利用真空提高薄膜溶液的填充能力。獲得的仿植物葉子表面結(jié)構(gòu)的薄膜具有高透光性及高霧度率,其透光率大于85%,且霧度也能夠達到70%；對具有仿生結(jié)構(gòu)薄膜的太陽能電池進行光電效應測試,結(jié)果表明：仿生薄膜可以提高太陽能電池的光電效應,與沒有仿生薄膜的太陽能電池相比較,其光電效應能夠提高8%以上。設(shè)計了激光點光源的光散射實驗裝置,點光源分別通過仿生薄膜和光滑薄膜,拍攝兩種薄膜的散光率,結(jié)果表明：仿生薄膜的散光角度達到20°以上,而光滑薄膜的光散幾乎沒有改變,證明仿生薄膜的表面結(jié)構(gòu)完成改變了光路光程,光路光程的變化是其光學特性和光電效益提高的主要原因。將仿生薄膜表面結(jié)構(gòu)進行抽象、模型化、建立幾何模型,并對具有代表性的圓錐形、圓形、三角形的第一級織構(gòu),第一級織構(gòu)分布100-500nm級短棒狀、小圓點的分級織構(gòu)進行模擬計算,結(jié)果表明：仿生薄膜的分級織構(gòu)具有更低的反光率、高的透光率；納米結(jié)構(gòu)在光照射的情況下出現(xiàn)衍射現(xiàn)象,這是光通過仿生薄膜時產(chǎn)生光散射現(xiàn)象和提高光學效應的主要原因。
[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.

【學位授予單位】：安徽工程大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB391

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相關(guān)博士學位論文 前2條

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本文編號：1393944