研究生: |
趙立德 Li-te Chao |
---|---|
論文名稱: |
奈米孔洞低介電常數材料在半導體製程整合上之研究 A study of nanoporous silica of low dielectric constant materials for ULSI applications |
指導教授: |
施漢章
Han C Shih |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 材料科學工程學系 Materials Science and Engineering |
論文出版年: | 2001 |
畢業學年度: | 89 |
語文別: | 中文 |
論文頁數: | 103 |
中文關鍵詞: | 低介電常數材料 、銅製程 、填洞能力 、硬度 、蝕刻後潔淨製程 |
外文關鍵詞: | low-k dielectric constant, copper metallization, gap-filling, hardness, post-cleaning process |
相關次數: | 點閱:3 下載:0 |
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摘要
當半導體製程進入深次微米世代,而積體電路(IC)的技術主要著重於元件的縮小化,然而元件速度受限於訊號在金屬連線間傳送的延遲效應,為了改善此問題,必須利用低介電常數材料來降低金屬連接線中的電容值及訊號在金屬連線間傳送的時間延遲,進而提高元件之工作效率。
本論文在研究積體電路製造技術中的多層導體連線製程,探討奈米孔洞低介電常數材料(Nanoporous silica)在製程整合中遇到的問題而做詳細的探討與分析1)對於奈米孔洞二氧化矽薄膜的填洞能力,在加入TMCS於前驅物溶液後,不僅幫助填洞能力,也增進薄膜之疏水性,進而使K值降至2以下。2)在潔淨製程中能夠對ST-250(ATMI)溶液不產生任何作用,並且加入HMDS後也能將K值降至2.3。3)在鍛燒製程中以400℃、30分鐘的條件下能夠達到較佳的硬度值,和最低的K值,並且在鍛燒後加入一次的HMDS會有較佳的硬度值4)對奈米孔洞二氧化矽薄膜在退火溫度400-500℃時可承受銅金屬的擴散,可以從歐傑電子縱深分佈及X光繞射圖中可證明。
Abstract
Among various low-k materials, spin-on-glass (SOG) materials have been widely used as an interlayer dielectric in multilevel interconnections because of their ease of application and relatively low process costs. Porous materials are promising low-k materials with dielectric constant below 2; however, candidates should have good mechanical, thermal properties and minimum moisture adsorption. Compatibility of the films with IC processing was also investigated in this work.
Spin-coating conditions have been optimized by various spin rates, precursor compositions and pre-coating treatments. The trimethylchorosilane (TMCS) in the precursor solution not only enhanced the hydrophobicity of the nanoporous silica film, but also the gap-filling ability on the aluminum trenches. In addition, 400℃ was found a good curing temperature for obtaining a low dielectric constant (1.93), good strength (65 Mpa) and hardness (1.4 Gpa).This work presents the results of nanoporous silica compatibility with the materials used in cleaning process and copper metallization.
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