| 研究生: |
周佳賢 Chia-Hsien Chou |
|---|---|
| 論文名稱: |
高熱穩定性的鎳/銀鋁合金薄膜應用在 High thermally stable Ni/Ag(Al) alloycontact on p-GaN |
| 指導教授: |
劉正毓
Cheng-Yi Liu |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 化學工程與材料工程學系 Department of Chemical & Materials Engineering |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 45 |
| 中文關鍵詞: | p型氮化鎵 、歐姆接觸 |
| 外文關鍵詞: | p-type GaN, ohmic contact |
| 相關次數: | 點閱:12 下載:0 |
| 分享至: |
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關於Ni/Ag 應用於p型氮化鎵的歐姆接觸(ohmic contact),其電性及光性的表現已經有被廣泛地研究。本篇論文研究主要在於銀裡面添加一點點鋁成為合金去抑制銀在p型氮化鎵表面聚集,提昇歐姆接觸的熱穩定性。
我們發現Ni/Ag歐姆接觸在500 oC熱處理後,氮化鎵表面上有島狀的銀聚集(silver agglomeration)形成。銀聚集(silver agglomeration)的結果導致特徵接觸電阻(specific contact resistance)上升及反射率下降。為了改善此一情況,我們預先將銀和鋁製作成一銀合金靶材來製作電極,其中鋁的組成為10 at.%。接著利用TLM (transmission line method)量測特徵接觸電阻其值為2.25 × 10-2 Ω-cm2,在500 oC長時間下發現銀鋁合金的特徵接觸電阻較純銀穩定。另外用四眼探針法(four-point probe method)量測片電阻(sheet resistance)亦發現銀鋁合金較純銀穩定,在400 oC ~ 700 oC的溫度條件下。而且在500 oC下為87 % @ 460nm之高反射率。因此我們提出Ni/Ag(Al)的結構可以有效抑制銀的聚集,提升歐姆接觸的熱穩定性,並且同時擁有高反射率的特性。
The thermal stability of Ni/Ag and Ni/Ag(Al) p-GaN contacts in relation to their electrical and optical properties was investigated. Ag agglomeration was found to occur at Ni/Ag to p-GaN contacts after annealing at 500 oC. This Ag agglomeration led to the poor thermal stability showed by the Ni/Ag contacts in relation to the reflectivity and electrical properties. However, after alloying with 10 at.% Al, the Ni/Ag(Al) p-GaN contacts were found to be free of Ag agglomeration thereby greatly enhancing the thermal stability. The values of the specific contact resistance and relative reflectance of the Ni/Ag(Al)samples was 2.25×10-2 Ω-cm2 and > 87%, at 460 nm after annealing at up to 600 oC .
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