Bewise Inc.


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離子束濺鍍沉積參數及調變範圍

 


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晶種層之沉積
金屬連線在深次微米製程中,via或trench的填充能力,是影響製程技術重要的關鍵,若是填充能力不良在via或trench中形成孔洞或是階梯覆蓋不均勻,會造成電阻率激增且性質不均。
通 常會影響via或trench填充能力的因素除了無電鍍銅的晶粒大小及其沉積速率之外,催化晶種層也扮演重要角色,催化層與擴散阻障層的附著力以及階梯覆 蓋率(step coverage),影響銅膜與擴散阻障層間的附著性。若是無電鍍銅晶粒過大將無法填入較小的via或trench,因此適當的晶粒大小有助於小洞的填 充。
而沉積速率太快則使得銅膜成長鬆散、不緻密,在較小的via或trench中容易形成void或不連續的膜,故控制適當的沉積速率才能獲得良好的鍍膜品質。


 


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(a)

 


 


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(b)


(a) 介電層經過圖案化再沉積阻障層之試片截面,將試片劈開後,利用FESEM觀察其橫截面,此via深1μm、寬0.5μm,深寬比約2:1。(b)相同的試 片經過離子束濺鍍沉積後,濺鍍沉積時間為30分鐘之試片截面,由圖上看到via最底層以及上層的壁上均附著較薄的銅晶種層。


 


圖示:

 


濺鍍沉積時間45分鐘之試片截面,一樣可看出有較薄的銅晶種層附著,此via深1μm、寬1μm,深寬比約1:1。


碧威股份有限公司www.tool-tool.com
國立勤益技術大學機械系
教授:張子欽博士

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