表面等離子激元提高半導(dǎo)體光提取效率的結(jié)構(gòu)設(shè)計(jì)
發(fā)布時(shí)間：2018-10-26 10:28
【摘要】：近年來,Ga N基LED在LED家族中發(fā)展十分迅速,用它可以制造出藍(lán)光LED,再配合上其他材料制造的紅光和綠光LED便可以實(shí)現(xiàn)全彩色顯示。由此可見,Ga N基LED相關(guān)技術(shù)的發(fā)展?jié)摿薮�。但�?由于半導(dǎo)體材料固有的屬性,Ga N基LED的效率并不十分理想,仍然存在提升性能的巨大空間。本文主要討論采用目前熱門的介質(zhì)/金屬納米結(jié)構(gòu)和表面等離子激元技術(shù)來提高Ga N基LED性能。研究采用現(xiàn)代光電子器件分析中常用的時(shí)域有限差分法,建立Ga N基LED的各種參數(shù)模型,討論介質(zhì)/金屬納米結(jié)構(gòu)對(duì)Ga N基LED性能的影響,并進(jìn)行結(jié)構(gòu)優(yōu)化,為開發(fā)新型高效的Ga N基LED提供理論支持。論文的主要內(nèi)容包括:1、在LED光提取效率發(fā)展和研究現(xiàn)狀的基礎(chǔ)上,對(duì)LED發(fā)光效率低的原因進(jìn)行了討論,并詳細(xì)介紹了目前幾種提高LED光提取效率的方法及其優(yōu)缺點(diǎn)。2、介紹了表面等離子激元的概念及發(fā)展歷程,分析了表面等離子激元的電磁場(chǎng)性質(zhì)。闡述了石墨烯的基本性質(zhì)及石墨烯中的等離子激元。重點(diǎn)探討了利用表面等離子激元提高LED光提取效率的原理。3、通過在銀膜上表面刻蝕的長(zhǎng)方體點(diǎn)陣所形成的二維光柵和在銀膜下表面刻蝕一維光柵構(gòu)建了混合光柵LED模型,利用時(shí)域有限差分法進(jìn)行數(shù)值模擬,發(fā)現(xiàn)在混合光柵模型下光提取效率有了較大幅度的提高。經(jīng)過對(duì)結(jié)構(gòu)中的光柵周期、占空比、銀膜厚度及光源深度等參數(shù)進(jìn)行優(yōu)化,仿真得出:在光柵周期280nm,占空比0.23,銀膜厚度20nm,光源深度20nm時(shí),光提取效率較普通LED結(jié)構(gòu)提高了18倍。4、用石墨烯替代混合光柵LED模型中的金屬層,以減少光在金屬層中的損耗,并在石墨烯表面刻蝕Ga N光柵形成石墨烯光柵LED模型。經(jīng)過數(shù)值模擬,結(jié)果表明石墨烯光柵LED模型光提取效率較混合光柵LED模型提高約1.7倍。
[Abstract]:In recent years, Ga N based LED has developed rapidly in the LED family. It can be used to produce blue light LED, and other materials to produce red and green light LED to achieve full color display. It can be seen that the development potential of, Ga N-based LED related technology is great. However, because the efficiency of, Ga N based LED is not ideal, there is still huge room for improving performance. In this paper, we mainly discuss how to improve the properties of Ga N-base LED by using the popular dielectric / metal nanostructures and surface plasmon technology. In this paper, the finite difference time-domain (FDTD) method, which is commonly used in the analysis of modern optoelectronic devices, is used to establish various parameter models of Ga N-base LED. The influence of dielectric / metal nanostructures on the properties of Ga N-based LED is discussed, and the structure is optimized. It provides theoretical support for the development of new and efficient Ga N-based LED. The main contents of this paper are as follows: 1. On the basis of the development of LED light extraction efficiency and the current research status, the reasons for the low luminescence efficiency of LED are discussed, and several methods to improve the LED light extraction efficiency are introduced in detail. 2. The concept and development of surface plasmon are introduced, and the electromagnetic properties of surface plasmon are analyzed. The basic properties of graphene and plasma excitators in graphene are described. The principle of using surface plasma excitators to improve the efficiency of LED extraction is discussed. 3. The LED model of hybrid gratings is constructed by etching the two dimensional gratings on the surface of the silver film and the one dimensional grating etched on the surface of the silver film by using the cuboid lattice etched on the surface of the silver film. The finite difference time-domain (FDTD) method is used to simulate the optical extraction efficiency. It is found that the optical extraction efficiency is greatly improved under the hybrid grating model. The parameters of grating period, duty cycle, silver film thickness and light source depth are optimized. The simulation results show that when grating period is 280 nm, duty cycle is 0.23, silver film thickness is 20 nm, and light source depth is 20nm, The light extraction efficiency is 18 times higher than that of ordinary LED structure. Graphene is used to replace the metal layer in the mixed LED model to reduce the loss of light in the metal layer, and the Ga N grating is etched on the graphene surface to form the graphene grating LED model. The numerical simulation results show that the light extraction efficiency of the graphene grating LED model is about 1.7 times higher than that of the mixed grating LED model.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：O539;TN312.8
本文編號(hào)：2295423
[Abstract]:In recent years, Ga N based LED has developed rapidly in the LED family. It can be used to produce blue light LED, and other materials to produce red and green light LED to achieve full color display. It can be seen that the development potential of, Ga N-based LED related technology is great. However, because the efficiency of, Ga N based LED is not ideal, there is still huge room for improving performance. In this paper, we mainly discuss how to improve the properties of Ga N-base LED by using the popular dielectric / metal nanostructures and surface plasmon technology. In this paper, the finite difference time-domain (FDTD) method, which is commonly used in the analysis of modern optoelectronic devices, is used to establish various parameter models of Ga N-base LED. The influence of dielectric / metal nanostructures on the properties of Ga N-based LED is discussed, and the structure is optimized. It provides theoretical support for the development of new and efficient Ga N-based LED. The main contents of this paper are as follows: 1. On the basis of the development of LED light extraction efficiency and the current research status, the reasons for the low luminescence efficiency of LED are discussed, and several methods to improve the LED light extraction efficiency are introduced in detail. 2. The concept and development of surface plasmon are introduced, and the electromagnetic properties of surface plasmon are analyzed. The basic properties of graphene and plasma excitators in graphene are described. The principle of using surface plasma excitators to improve the efficiency of LED extraction is discussed. 3. The LED model of hybrid gratings is constructed by etching the two dimensional gratings on the surface of the silver film and the one dimensional grating etched on the surface of the silver film by using the cuboid lattice etched on the surface of the silver film. The finite difference time-domain (FDTD) method is used to simulate the optical extraction efficiency. It is found that the optical extraction efficiency is greatly improved under the hybrid grating model. The parameters of grating period, duty cycle, silver film thickness and light source depth are optimized. The simulation results show that when grating period is 280 nm, duty cycle is 0.23, silver film thickness is 20 nm, and light source depth is 20nm, The light extraction efficiency is 18 times higher than that of ordinary LED structure. Graphene is used to replace the metal layer in the mixed LED model to reduce the loss of light in the metal layer, and the Ga N grating is etched on the graphene surface to form the graphene grating LED model. The numerical simulation results show that the light extraction efficiency of the graphene grating LED model is about 1.7 times higher than that of the mixed grating LED model.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：O539;TN312.8
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