研究生: |
黃忠民 Jung Min Hwang |
---|---|
論文名稱: |
高效率三五族固態光源關鍵技術開發 KEY TECHNOLOGY DEVELOPMENT FOR HIGH EFFICIENCY III-V BASED SOLID-STATE LIGHTING SOURCE |
指導教授: |
黃惠良
Huey Liang Hwang |
口試委員: | |
學位類別: |
博士 Doctor |
系所名稱: |
電機資訊學院 - 電子工程研究所 Institute of Electronics Engineering |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 英文 |
論文頁數: | 380 |
中文關鍵詞: | 白光二極體 、固態光源 、氮化鎵 、光電化學蝕刻 、發光元件結構設計 、微米發光元件 |
外文關鍵詞: | white LED, solid state lighting source, GaN, photoelectrochemical etching, LED structure design, micro LED |
相關次數: | 點閱:5 下載:0 |
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固態白光光源可以利用不同的方法來產生. 每種方法會以價格,效能及技術需求來評量。固態白光光源的研究及挑戰在學術界或業界不斷的進行著. 本篇論文主要著重於效能及技術需求. 本論文描述現今氮化鎵發光元件製作主要的技術包含長晶,摻雜,電極,蝕刻,封裝。如何製作高效率元件是本論文主要的研究重點。本論文研究提供的改善內部量子效率的解決方案。我們發明一種間斷光源式光輔助化學蝕刻方式製作元件。這種無傷害性蝕刻可以製作非常平坦的氮化鎵蝕刻表面,平坦度為0.37nm。此方法可以製作出平坦,均勻,大面積的氮化鎵蝕刻表面,此種方法可以延伸到p型氮化鎵蝕刻,此種方法可以克服光電化學無法蝕刻p型氮化鎵的限制。光輔助化學蝕刻方式製作的發光元件第一次被成功製作出。另外表面處理的方法也被發展出來。短時間熱氫氧化鉀水溶液處理或是低溫光輔助蝕刻處理。當元件尺寸縮小時蝕刻所造成的傷害是一個關鍵議題.本論文研究提供元件改善光取出效率的解決方案,我們經由光輔助化學蝕刻方式改善氮化物發光元件及磷化物發光元件的光取出效率。本論文研究提供元件改善電力效率的解決方案,p-型氮化鎵的研究議題包含氫萃取及歐姆電擊。如何減少串連電阻及機制討論被清楚的描述。此串連電阻包含p-型氮化鎵材料電阻及接觸電極電阻。討論氮化鎵結構及元件尺寸縮小的效應,當元件尺寸縮小電流擁擠效應將會被抑制。許多本論文研究所發展出的應用被展示,包含數位光源及快速測試方法。在此論文中,多種結構尺寸經由多種方法製造。可以製作出300微米至10奈米的氮化物結構大小。結構大小300微米至4微米的發光元件結構經由黃光微影及蝕刻製作出。經由控制黃光微影時的繞射現象或是過蝕刻金屬光罩,元件的尺寸可以由2微米至0.5微米.氮化鎵的發光元件或p/n二極體平台結構可以被製作出來。100奈米至30nm奈米的氮化鎵可以經由光輔助化學蝕刻方式製作。此結構製作是經由缺陷引起的表面型態。50奈米至10nm奈米的氮化鎵線狀結構可以經有光輔助化學蝕刻方式製作。如何製作氮化鎵奈米發光元件將是未來主要發展方向。當元件尺寸由微米進入奈米時,在製作及模型建立仍然有相當多的挑戰。本論文亦從事結構設計最佳化及覆晶式微米元件熱模擬.研究及發展微米發光元件,奈米發光元件,量子點發光元件製作下世代光源是一個有趣,有價值及挑戰性的工作。
There had various methods to generate the white light of SSL. Each method could be evaluated by cost, performance, and technology requirement. The research and challenge for industry or scientist was still in progress. The thesis was focus on the discussion of performance and technology requirement. The major technology now for III-nitride based LED fabricated including III-Nitride growth, doping, contact, etching and package was presented. How to make the high efficiency device was the research key point in this thesis. The solution was listed below in my research.
² Solution for Improvement of internal quantum efficiency
We invented a photon-assisted wet etching with chopped photon source method for device fabrication. This damage free etching method could produce an ultra-smooth etching surface with RMS=0.37nm in GaN. The smooth, uniform, and broaden etching surface in GaN by ELPEC-CS was achieved. The methods was extended to etching p-type GaN, the physical limitation in photoelectrochemical etching was overcame. The first blue LED fabricated by photon-assisted wet etching method was fabricated. The surface treatment methods were also developed. The surface state was removed by boiled KOH treatment with short time or photon assisted cryogenic etching. The etching damage was the key issue while the device was scale down.
² Solution for Improvement of light extraction efficiency
The light extraction method in the III-Nitride LED and III-Phosphide LED were developed by our photon-assisted wet etching method.
² Solution for Improvement of electrical efficiency
n The p-type GaN issue was considered in hydrogen extraction and ohmic contact. The series resistance included resistance of p-type GaN and contact resistance were reduced and discussed in detail.
n The scale-down effect of the III-Nitride structure and device was discussed. While the device scaling down, the current crowding effect will be suppressed.
Many application of my research were presented including Digital light source and quick testing method. In the thesis, various structure sizes were fabricated by various etching technology. The size of III-Nitride based structure was fabricated from 300mm to 10nm. The LED structure from 300mm to 4mm could be formed by photolithography following by etching. By controlling photolithography in diffraction mode or over etching the metal mask, the size could be reduced from 2mm to 0.5mm. The mesa GaN LED or P/N diode could be fabricated. The nano structure from 100 to 30nm of GaN could be formed due to the dislocation-induced morphology during etching in photo-assisted wet etching. The structure with 50~10nm nano-wire could be fabricated in GaN or p-GaN during photo-assisted wet etching. The micro-LED was successfully fabricated. How to make the nano-LED with scale-down (100~0.1nm for nano scale) for III-Nitride was the major research in the future. The optimized device structure was designed by the commercial software with lattice mismatch control concept. The heat extraction in III-Nitride based flip chip LED and III-Phosphide vertical LED was designed. The scale-down effect of the thermal extracted was designed and discussion.
There still had much challenges for fabricating or modeling while device was scale-down from micro to nano scale (100nm-0.1nm). The research and develop of micro-LED, nano-LED or quantum dot LED for “Next generation light source” was an interested, valuable and challenge work.
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