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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51858
標題: | 以奈米結構增益二極體發光展現與寬波段光偵測元件效率之研究 The study of using nanostructure to improve the performance of light-emitting-diode and the efficiency of broadband photodetector |
作者: | Chih-Yu Lu 盧致宇 |
指導教授: | 陳學禮 |
關鍵字: | 奈米結構,發光二極體,光偵測器,光萃取效率,奈米粒子,蕭特基接面,演色性,抗藍光,抗反射,奈米鐘乳石結構,磁藕極共振, nanostructure,light-emitting diode (LED),photodetector,light extraction efficiency,nanoparticle,Schottky junction,color rendering index,anti-blue light,anti-reflection,broadband detection,nano-stalactites structure,magnetic dipole resonance, |
出版年 : | 2015 |
學位: | 碩士 |
摘要: | 奈米結構被廣泛應用於許多領域中,本論文中將以奈米結構製作光電元件並增益其效率,其中包括發光二極體(LED)的發光展現與寬波段光偵測元件效率之研究。
在本論文的第一部份,為了增加二極體之發光效率,我們模擬奈米粒子對發光二極體之出光效率增益效果,並實際製作發光二極體之改良封裝層確認奈米粒子對發光二極體出光之增益能力。利用奈米粒子破壞螢光封裝層與空氣界面的全反射現象,減少全反射的發生。並配合介電質奈米粒子所具有的磁偶極共振而增益散射現象,增加發光二極體之光萃取效率。除了增加出光效率的優點外,此奈米粒子塗佈之封裝層還可增加白光發光二極體之演色性,並具有減低藍光出光比率的效果。 而在論文的第二部份, 我們利用奈米結構增益寬波段光偵測元件效率。在矽基板製作微小的奈米鐘乳石結構,並在其上鍍上金的薄膜,用以製作寬波段的光偵測器。此奈米結構具有寬波段抗反射特性,配合金薄膜與矽基板間有良好整流特性的蕭特基接面及紅外光波段的熱載子激發效應,使其具有從紫外光至紅外光的寬波段偵測能力。此奈米結構具有製程簡單、便宜,不需複雜的半導體製程之優點。此外,此元件可以在零外加偏壓的情況下進行操作以及偵測弱光的能力。 Nanostructures have been widely applied in different fields in recent years. In this thesis, we used nanostructures to construct optoelectronic devices and enhance their efficiency. The main topics of the thesis include designing nanostructures for enhancing the performance of light-emitting diodes (LEDs) and broadband working photodetectors. In the first part of the thesis, we designed a modified phosphor layer of white LED by the scattering effect and magnetic dipole resonance of nanoparticles. Then we fabricated the LED phosphor layer with nanoparticles modification proving the ability to improve light-extraction. The total internal reflection between the interface of phosphor encapsulation and air could be destructed by using nanoparticles, and the output light could be largely scattered by the magnetic dipole resonance effect on nanoparticles, thus enhancing the light extraction of white LED. Furthermore, the nanoparticles based structures could also enhance the color rendering and reduce the blue light emission. In the second part of the thesis, we used nanostructures to prepare broadband working photodetectors. We fabricated nano-stalactites structures on silicon (Si) wafer, followed by coating Au film on it that could easily prepare the broadband working photodetectors. This nanostructures possess well anti-reflective property from ultraviolet to near infrared ray regime. Combining the anti-reflective property with the Schottky junction of Au/Si, the generated hot carriers could provide the device with broadband detection ability. This nanostructure based devices had the advantages of simple fabrication processes and low cost. Besides, this device can operate at zero bias voltage condition and had the ability of low-light detection. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51858 |
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顯示於系所單位: | 材料科學與工程學系 |
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