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Investigation of AlGaN MOS Diode Prepared by Liquid-Phase Deposition Oxide 林遠祁、黃俊達

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Investigation of AlGaN MOS Diode Prepared by Liquid-Phase Deposition Oxide 林遠祁、黃俊達

E-mail: [email protected]

ABSTRACT

In this experiment, we have deposited high quality silicon dioxide (SiO2) layer onto AlGaN as gate oxide by using liquid-phase deposition (LPD) with supersaturated H2SiF6 and H3BO3 solution at room temperature. Before depositing silicon dioxide (SiO2), the AlGaN were treated with (NH4)2Sx solution. After that, the AlGaN MOS structures were developed to discuss their

current-voltage (I-V) and capacitance-voltage (C-V) properties with and without (NH4)2Sx-treated. In material analysis, the ESCA, FTIR and EDS were measured to analyze the composition, chemical bonding of silicon dioxide.

Keywords : AlGaN ; LPD ; MOS ; (NH4)2S

Table of Contents

封面內頁 簽名頁 授權書.........................iii 中文摘要............

............iv 英文摘要........................v 誌謝.........

.................vi 目錄..........................vii 圖目錄...

......................ix 表目錄.........................xi 第 一章 緒論 .......................1 第二章 理論 ...................

....4 2-1 金屬/半導體接觸之原理................4 2-1-1 蕭特基能障(Schottky Barrier ) ....

.....4 2-1-2 歐姆接觸 .....................5 2-2 金屬-氧化層-半導體(MOS) .....

.........7 2-2-1界面態對MOS的影響.................11 2-2-2氧化層電荷 ......

..............12 2-3 LPD-SiO2簡介....................15 第三章 實驗方法及 量測..................18 3-1 LPD-SiO2薄膜成長..................18 3-1-1 氮化鋁鎵備製...................18 3-1-2 AlGaN基板的清洗步驟..............

.19 3-1-3 成長LPD-SiO2薄膜.................20 3-1-4 膜厚量測...............

.......21 3-2 材料分析.......................21 3-3 MOS元件製作.......

..............24 3-3-1 硫化處理......................24 3-3-2 歐姆接觸之製 作...................24 3-3-3 熱處理(Annealing)................27 3-3-4 沉積LPD閘極氧化層.................28 3-3-5 在閘極氧化層上蒸鍍鋁電極...........

...28 3-4 光電量測.......................29 第四章 實驗結果與討論........

...........30 4-1 LPD-SiO2薄膜厚度量測結果...............30 4-2 材料分析結果...

..................30 4-3 歐姆接觸電性量測結果.................33 4-4 LPD-SiO2 MOS元件J-E電特性..............34 4-5 LPD-SiO2 MOS元件C-V電特性.........

.....35 4-6 MOS元件在照光及不照光下電性之影響...........36 第五章 結論..........

...............37 參考文獻..........................38 圖目錄 圖2-1 金屬與n型半導體接觸能帶圖............40 圖2-2 金屬/半導體界面之電流傳輸機制 .........

.41 圖2-3 簡單電容示意圖..................42 圖2-4 金氧半二極體的結構圖.........

......42 圖2-5 偏壓下金氧半二極體電容的能帶圖..........43 圖2-6 VG=0的理想MOS 二極體之能帶 圖.........44 圖2-7 N型半導體表面之能帶圖..............44 圖2-8 N型MOS二極體,表面 電位與載子變化之情況 ....45 圖2-9 N型半導體之理想MOS C-V 曲線..........45 圖2-10 N型MOS二極 體電容效應之等效電路圖.......46 圖2-11 MOS 結構中四種電荷之分佈狀態..........46 圖3-1 氮化 鋁鎵結構圖..................47 圖3-2 液相沉積法系統圖.................47 圖3-3 液相沉積法流程圖.................48 圖3-4 α-step量測方式示意圖 ...........

...48 圖3-5 製作歐姆接觸之流程圖...............49 圖3-6 沉積LPD-SiO2之流程圖.......

.......50 圖3-7 MOS元件結構圖.................51 圖4-1 六氟矽酸0.5M時,沉積速率圖.

..........51 圖4-2 氮化鋁鎵(Al0.2Ga0.8N) PL光譜圖...........52 圖4-3 未成長LPD-SiO2薄 膜EDS圖............52 圖4-4 氮化鋁鎵成長LPD-SiO2薄膜EDS圖.........53 圖4-5 有無使用硫 化處理所沉積的LPD-SiO2薄膜FTIR圖..54 圖4-6 有無硫化處理Al (2p)的XPS圖...........55 圖4-7 有沒硫

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化處理Ga (3d)的XPS圖...........55 圖4-8未硫化,LPD-SiO2薄膜未退火Si的ESCA成份圖...56 圖4-9未 硫化,LPD-SiO2薄膜700度退火Si的ESCA成份圖.56 圖4-10未硫化,LPD-SiO2薄膜800度退火Si的ESCA成份圖.57 圖4-11未硫化,LPD-SiO2薄膜900度退火Si的ESCA成份圖.57 圖4-12未硫化,LPD-SiO2薄膜未退火O的ESCA成份圖..

.58 圖4-13未硫化,LPD-SiO2薄膜700度退火O的ESCA成份圖.58 圖4-14未硫化,LPD-SiO2薄膜800度退火O的ESCA成 份圖.59 圖4-15未硫化,LPD-SiO2薄膜900度退火O的ESCA成份圖.59 圖4-16 Ti/Al/AlGaN在氮氣下改變不同退火溫度 的I-V圖...60 圖4-17 六氟矽酸0.5M,硼酸0.01M時的J-E圖.......60 圖4-18 六氟矽酸0.5M,硼酸0.005M時 的J-E圖......61 圖4-19 六氟矽酸0.5M,硼酸0.003M時的J-E圖......61 圖4-20 六氟矽酸0.5M,總整理的J-E 圖..........62 圖4-21 六氟矽酸0.5M,電場 1MV/cm下漏電流密度整理..62 圖4-22 硫化處理後LPD-SiO2 於高頻下所量測C-V電性圖..63 圖4-23 氮化鋁鎵 MOS結構在照光下的示意圖.......63 圖4-24 H3BO3 0.003M 時,未硫化的光暗電流I-V特性比較圖.64 圖4-25 H3BO3 0.003M時,硫化後的光暗電流I-V特性比較圖.64 表目錄 表一 未成長LPD-SiO2成份分析表............53 表二 未硫化,成長LPD-SiO2成份分析表.........53 表三 硫化後,成長LPD-SiO2成份分析表.........54 表四 有無硫化下,在照光及不照光下的光暗電流比...

..65

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參考文獻

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