研究生: |
黃興安 Hsing-an Huang |
---|---|
論文名稱: |
反應性濺鍍氮化鈮薄膜及其作為銅導線之阻障層的失效機制研究 Growth of NbNx Films by Reactive Sputtering and the Investigation of Failure Mechanism Barrier Layers for Copper Metallization |
指導教授: |
李嘉平
Chiapyng Lee |
口試委員: |
朱瑾
Jinn P. Chu 王文 Wun Wang |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2010 |
畢業學年度: | 98 |
語文別: | 中文 |
論文頁數: | 116 |
中文關鍵詞: | 氮化鈮 、反應性濺鍍 、擴散阻障層 |
外文關鍵詞: | NbNx, Reactive Sputtering, Diffusion Barrier |
相關次數: | 點閱:353 下載:5 |
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本研究主要以反應性濺鍍來成長NbNx薄膜於銅-矽基材多層膜系統中擴散阻障層失效機制的研究。觀察N2/Ar流量比對NbNx薄膜之沈積速率、N/Nb原子比、結晶結構、電阻率及表面型態之影響。實驗結果顯示,我們的NbNx薄膜的沈積速率會隨著N2/Ar流量比的增加而下降,薄膜結晶結構會依N2/Ar流量比的增加,會以 BCC α-Nb → Hexagonal β-Nb2N → Tetragonal γ-Nb4N3 → FCC δ-NbN的行徑作改變;N/Nb原子比與電阻率會隨著N2/Ar流量比的增加而增加,當N2/Ar流量比為0,此時有着24.8 μΩ-cm的最低值之薄膜電阻率。
接著以in-situ的方式成長Cu(60nm)/NbNx(25nm)/Si的多層膜系統,用來觀察不同的阻障層對於銅的阻障性質研究。研究中利用SEM、XPS、XRD、TEM及FPP等分析儀器,用來分析在多層膜系統中,不同條件的阻障層在經由熱處理後的相互擴散及反應現象,最後會求出不同條件之barrier的擴散係數及其擴散活化能;結果顯示Cu(60nm)/NbNx(25nm)/Si多層膜系統的失效溫度會隨著擴散阻障層的氮含量增加而上升,而在N2/Ar流量比為0.2時濺鍍的薄膜NbN0.803有著最好的阻障層性質,當退火時間為1小時時,其失效溫度為750~800℃。
This study is to evaluate the NbNx thin films which were deposited on silicon by reactive sputtering, and investigate the failure mechanism as diffiusion barrier for Cu/Si multilayered system. Our results showed that the deposition rate, N/Nb atomic ratio, crystalline structure, resistivity and surface morphology of NbNx thin film depended on the N2¬/Ar flow ratio. The deposition rate of NbNx thin film decreased as the N2/Ar flow ratio increased. With increasing N2/Ar flow ratio of NbNx thin film, phase transformation are identified as BCC α-Nb → Hexagonal β-Nb2N → Tetragonal γ-Nb4N3 → FCC-NbN. The N/Nb atomic ratio and resistivity increased with increased the N2/Ar flow ratio. When the N2¬/Ar flow ratio is 0, a minimum resistivity of 24.8 μΩ-cm in film was also obtained.
Then deposition the Cu(60nm)/NbNx(25nm)/Si multilayers were grown by in-situ to analyze Cu diffusion barrier properties. We utilized SEM, XPS, XRD, TEM and FPP to observe diffusin and reaction phenomenon of diffusion barrier in Cu/Si multilayered system after thermal treatment, and obtain the diffusion coefficient and diffusion activiation energy of barrier with different N2¬/Ar flow ratio. Finally, experiment results indicated that the failure temperature of Cu(60nm)/NbNx(25nm)/Si multilayered structure raised as the nitrogen concentration of diffusion barrier increased. Moreover, the barrier with N2/Ar flow ratio at 0.2 (NbN0.803)possessed the best barrier performance. It was found that the NbN0.803 film can prevent Cu-Si interaction up to 750 ℃. The Cu/NbN0.803/Si is fairly stable up to annealing at 750~800 ℃ for 1 hour.
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