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標題: 磊晶粗化對高亮度發光二極體光粹取率之影響
Effects of Surface Roughening by Epitaxical Growth on Light Emitting Diodes for High Brightness Applications
作者: 陳宗良
Chen, Tsung-Liang
關鍵字: GaN;氮化鎵;Surface Roughening;磊晶粗化
出版社: 精密工程學系所
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在實驗結果指出,島狀顆粒的粗化可得到較佳之光粹取率,其光粹取效率可達 84.3 %,約比沒有粗化之發光二極體提升了 48 % 左右,但是島狀顆粒順向操作電壓為 3.39 V,而未粗化與凹洞的粗化為 3.28 V 與 3.19 V,所以島狀顆粒順向操作電壓較未粗化與凹洞的粗化來的高。另外在島狀顆粒的粗化我們使用不同溫度與壓力來做測試,在溫度部分,我們以島狀顆粒粗化之成長溫度 1000 ℃ 為基準,分別使用 900 ℃ 與 1100 ℃ 作磊晶成長,其光粹取率分別為 74.21 % 與 59.08 %,兩者皆使光粹取率變差。
在壓力部分,同樣以島狀顆粒粗化之成長壓力 250 torr 為基準,分別使用 100 torr 與 400 torr 作磊晶成長,其光粹取率分別為81.04 % 與 87.17 %,在成長壓力為 400 torr 成長時所形成的粗化表面可得到最佳的光粹取率,約比成長壓力為 250 torr 之光粹取率提升了 3.4 % 左右。

In this investigation, we studied the effect of surface roughing on light extraction efficiency. The electrical and optical properties were characterized by electroluminescence and surface morphology measured by microscope and Scanning Electron Microscope.
In order to improve the light extraction efficiency, we tried to implement various growth conditions of P-type GaN layers to create surface roughing, such as pits-like and island-like surface. Experiment results indicated that the island-like surface had better light extraction efficiency. The light extraction efficiency was 84.3 % in island-like LED surface, and the light extraction efficiency increased 48 % as compared with that of non-surface roughing LEDs. But the forward driving voltage of island-like surface LED was 3.39V, and the forward driving voltage of non-surface roughing and pits-like surface LEDs were 3.28 V and 3.19 V. The forward driving voltage was higher than non-surface roughing and pits-like surface.
In this investigation, we implemented various parameters on growth temperature and pressure in order to create island-like surface. Base on 1000 ℃ growth temperature for island-like surface, we implemented 900 ℃ and 1100 ℃ for P-type growth individually. The light extraction efficiency were 74.21 % and 59.08 %. Experiment result indicated that the light extraction efficiency decayed both respected to 900 ℃ or 1100 ℃.
On the other hand, we changed growth pressure from 250 torr to 100 torr and 400 torr for p-type growth individually. The light extraction efficiency were 81.04 % and 87.17 %. Experiment result indicated that island-like growth pressure in 400 torr had best light extraction efficiency. The light extraction efficiency increased 3.4 % compared to island-like growth pressure in 250 torr.
其他識別: U0005-2708200710353500
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