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  • 學位論文

以氫氣製作氧化鋅奈米紋路結構之特性與應用於發光二極體之研究

GaN-based light-emitting diode with ZnO nanotexture layer prepared using hydrogen gas

指導教授 : 陳隆建
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摘要


本論文使用超音波噴霧熱解法(ultrasonic spray pyrolysis method)成長氧化鋅(ZnO)薄膜於矽基板與玻璃基板上,然後置於450℃的爐管中,使用氫氣做為乾蝕刻氣體,還原處理氧化鋅薄膜,以形成氧化鋅奈米紋路結構(ZnO nanotexture)。利用原子力顯微鏡(AFM)觀察氧化鋅奈米紋路結構的表面結構,經氫氣處理20分鐘後的薄膜,其表面粗糙度RMS由5.83nm提升至12.53nm。在400到800 nm 之間的波段,氧化鋅奈米紋路結構的光穿透率約在80-99 %之間。 另一方面,本論文將所得之氧化鋅奈米紋路結構應用於GaN-bsaed LED,把氧化鋅奈米紋路結構成長於GaN-bsaed LED之ITO透明導電層(TCL)上,於20mA電流注入下,順向偏壓為3.25V,對照沒有奈米紋路結構的GaN-bsaed LED可提升約27.5%的發光效率。

並列摘要


ZnO films were deposited on an indium tin oxide (ITO), which was the transparent conductive layer (TCL) of GaN-based light-emitting diodes (LED), by ultrasonic spraying pyrolysis to improve the light output power. The ZnO nanotexture was formed by treating the as-deposited ZnO films with hydrogen. The RMS roughness increased from 5.83 nm to 12.53 nm during treatment for 20 min. Typical current-voltage (I-V) characteristics of the GaN-based LED with a ZnO nanotexture layer have a forward-bias voltage of 3.25 V at an injection current of 20 mA. The light output power of GaN-based LED with ZnO nanotexture layer improved as high as about 27.5% at a forward current of 20 mA.

參考文獻


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