| 研究生: |
吳俊明 Wu, Juan-Ming |
|---|---|
| 論文名稱: |
以RF磁控濺鍍法在塑膠基材上沈積銅膜之性質研究 The Characteristic Studies of Copper Films Deposited on Plastic Substrates by Magnetron RF Sputtering Techniques |
| 指導教授: |
林天財
Lin, Tien-Chai 李世欽 Lee, Shih-Chin |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 106 |
| 中文關鍵詞: | 射頻磁控濺鍍 、聚亞醯胺 、銅膜 、附著力 、對位型聚苯乙烯 |
| 外文關鍵詞: | copper film, PI, sPS, RF sputtering, adhesion strength |
| 相關次數: | 點閱:113 下載:11 |
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隨著全球資訊及通訊產品的蓬勃發展,電子產品朝向小型化與多功能化,使得電子零件亦需邁向高集積化、高性能之動向發展,聚亞醯胺(Polyimide, PI)具有良好的高溫穩定性、抗氧化性、化學穩定性、低介電常數(dielectric constant),加上有優異的機械性質,及可撓曲等特性。因此,在PI基材上鍍上銅膜已經廣泛的應用在軟質印刷電路板上。然而,許多研究發現銅膜與PI基材的附著力普遍不佳,造成許多應用上的問題。
本研究採取以下兩種方法來改善銅膜與PI基材之附著力。首先對PI基材做電漿前處理,之後利用射頻磁控濺鍍法鍍上銅膜,經電漿處理後的PI基材銅膜附著力顯著的上升,以氧氣電漿,處理時間5分鐘時,可以得到最佳的附著力72.23MPa。第二,添加不同的中介層(包括金屬、氮化物及氧化物)於銅膜與PI基材間。其中,添加中介層ZnO、Ti及Cr可以改善銅膜與PI基材之附著力。此外,本研究也探討熱處理對銅膜性質的影響。高溫環境長時間的處理下,銅膜與PI基材之附著力明顯的下降,在溫度150℃大氣氣氛下,歷經36小時的處理,銅膜之附著力只剩下18.47 MPa。退火處理會大幅改善銅膜的性質(如電阻率及表面型態等),銅膜電阻率隨著退火溫度升高而有下降的趨勢,在退火溫度350℃可以得到最低的電阻率1.94μΩ-cm。
最後比較PI與對位型聚苯乙烯(syndiotactic polyester, sPS)不同基材的銅膜性質,研究顯示,PI基材擁有較高的表面能,使得銅膜的電阻率較低,也可以得到較佳的附著力。
Polyimides(PIs) have recently captured an accelerated interest for use in microelectronic applications. This is attributed to the fact that polyimides offer high temperature stability, oxidation and high chemical resistance, low dielectric constant, and excellent mechanical properties such as a high modulus of elasticity. For these reasons, copper-deposited PI substrate is widely used in flexible printed circuit boards.
Extensive studies on the relationship between a copper thin film and a polyimide substrate show that the adhesion strength is very weak. In this work, we introduce two methods to improve the adhesion strength between Cu and PI. First, after N2 and O2 plasma treatment of the PI substrate, the adhesion strength is substantially enhanced. The maximum adhesion strength of 72.23MPa is obtained for PI substrate treated in O2 plasma for 5 min. Second, we deposited various materials (including metal, nitride and oxide) on the polyimide substrate before deposited copper films. The adhesion strength is improved by adding ZnO, Ti and Cr. Finally, we investigate the effect of heat treatment on the copper thin film. The adhesion strength between the copper thin film and the PI substrate is reduced by heat treatment. The adhesion strength after heat treatment at 150℃ in air for 36 hours is decreased to 18.47MPa. Effect of annealing on the characteristic copper thin film such as resistivity and morphology was investigated. The electrical resistivity was lowered to 1.94μΩ-cm after argon atmosphere annealing at 350℃ for 30 min.
The characteristics of copper thin films grown PI and syndiotactic polyester (sPS) substrates were studied. Due to the difference of surface free energy between PI and sPS substrates, copper-deposited PI substrate has lower electrical resistivity and better adhesion strength.
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