Characteristics of a Low-Damage GaN-Based Light-Emitting Diode Using a KOH-Treated Wet-Etching Approach
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概要
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A GaN-based light emitting diode (LED) with an air-buffer layer and textured sidewalls is fabricated and investigated. A hot KOH etching solution is used to develop the desired textured sidewalls. Many sidewalls with triangular-like shape are produced along the specific direction of $\langle 1\bar{1}00 \rangle$, where photons introduced within multiple-quantum-well (MQW) exhibit more opportunities to scatter into the air. Based on the lateral etching, many triangular-shaped cones are formed on the patterned sapphire substrate (PSS). At 20 mA, as compared with the LED without KOH treatment, the studied device exhibits improved output power by 11.7% without deteriorating its electrical characteristics. This phenomenon can be attributed to the enhanced output light from vertical and lateral directions due to the formation of an air-buffer layer as well as textured sidewalls. The thermal reliability of the studied device is also comparable to the one without KOH-treated process.
- 2009-08-25
著者
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Liu Wen-chau
Institute Of Microelectronics Department Of Electrical Engineering National Cheng-kung University
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Tsai Tsung-han
Institute Of Microelectronics Department Of Electrical Engineering National Cheng-kung University
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Chen Tzu-pin
Institute Of Microelectronics Department Of Electrical Engineering National Cheng-kung University
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Chen Li-yang
Institute Of Microelectronics Department Of Electrical Engineering National Cheng-kung University
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Yen Chih-hung
Institute Of Microelectronics Department Of Electrical Engineering National Cheng-kung University
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Yu Kuo-hui
Institute Of Microelectronics Department Of Electrical Engineering National Cheng-kung University
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Liu Yi-jung
Institute Of Microelectronics Department Of Electrical Engineering National Cheng-kung University
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Yu Kuo-Hui
Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, No. 1, University Road, Tainan, Taiwan 70101, Republic of China
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Chen Tzu-Pin
Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, No. 1, University Road, Tainan, Taiwan 70101, Republic of China
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Yen Chih-Hung
Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, No. 1, University Road, Tainan, Taiwan 70101, Republic of China
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Tsai Tsung-Han
Institute of Microelectronics, Department of Electrical Engineering, National Cheng-Kung University, No. 1, University Road, Tainan, Taiwan 70101, Republic of China
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