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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64387
標題: | 垂直型發光二極體表面微結構粗化形狀對光萃取效率影響之研究 Study of Light Extraction Efficiency of Vertical Light Emiiting Diodes with Textured Surface roughening |
作者: | Guan-Jung Lai 賴冠中 |
指導教授: | 吳育任(Yuh-Renn Wu) |
關鍵字: | 發光二極體,粗化,光萃取效率,蒙地卡羅, Light Emiiting Diodes,roughening,Light emitting Diodes,Monte Carlo, |
出版年 : | 2012 |
學位: | 碩士 |
摘要: | 在本論文中,我們建構了二維的蒙地卡羅光跡追蹤法,並且輔以實驗室所開發的2D-DDCC模擬程式,解出飄移、擴散以及帕松方程式。
藉由結合這兩種程式,我們可以得到電流的資訊,發光輻射結合率分佈,並以此值帶入跑出元件的光萃取效率,如同我們所知,大部分發光二極體材料的折射率都大於空氣,所以大部分的光子入射在材料介質與空氣的交界上,會因為小角度的全反射角而返回元件中,這代表光很有可能會被元件吸收轉成熱能,以及造成了電流驟降的現象。 所以在發光二極體的光萃取效率優化上,二維蒙地卡羅光跡追蹤法扮演重要的角色。而我們將它運用在研究不同形狀的表面圖形化粗化、以及金屬接面的粗話與否對整體出光的影響,不同的n型氮化鎵層厚度以及多個電極設計、金屬大小不同對光萃取效率的影響。 In this thesis, we have developed a 2D Monte Carlo ray tracing method combined with our developed 2D-DDCC ( 2 Dimentional Drift Diffusion Charge Control ) program to solve Drift-Diffusion and Poisson equations. By combining these two techniques, we can obtain the carrier information, radiative recombination rate to estimate the device light extraction efficiency. As we know, most materials used for LED production have much higher refractive indices than the air. This means that many photons will be reflected back into the semiconductor at the medium/air interface due to the small total reflection angle. They also may be absorbed and be turned into heat, and making the LED efficiency droop. Therefore, 2D Monte Carlo ray tracing method plays important roles in optimizing the light extraction efficiency in the LED device. So we have applied our method to study in this thesis. We have studied several factors to enhance light extraction efficiency such as the changes in different shaped of roughness, metal area with roughness surface or flat surface, different n-GaN thickness , multiple metal contacts and different metal sizes. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64387 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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ntu-101-1.pdf 目前未授權公開取用 | 4.11 MB | Adobe PDF |
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