研究生: |
施孟甫 Shih, Meng-Fu |
---|---|
論文名稱: |
覆晶封裝底部封膠流場之觀測 Observation of the Filling Flow of Underfill Encapsulation in Flip Chip Package |
指導教授: |
楊文彬
Young, Wen-Bin |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 航空太空工程學系 Department of Aeronautics & Astronautics |
論文出版年: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 207 |
中文關鍵詞: | 覆晶封裝 、底部封膠 、毛細作用 、錫球間距 、邊緣加速效應 |
外文關鍵詞: | Flip Chip Encapsulation, Underfill, Capillary, Bump Pitch |
相關次數: | 點閱:215 下載:6 |
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近年來在電子科技不斷進步下,覆晶封裝要求更小的輪廓與更密集的連接點,面對晶片與基板之間的熱膨脹係數差異,錫鉛隆點更易受到熱應力變化而破壞,毛細力將底部封膠吸入在晶片與基板之間,調和熱膨脹係數的差異,並增加錫鉛隆點的可靠度,避免其在熱應力作用下產生疲勞,均勻的底部封膠充填要同時具備,良好的濕潤性與包圍住錫鉛隆點的品質,避免裂縫與封包的產生。覆晶封裝底部封膠的流動行為在過往研究當中,已有不少實驗與模擬討論底部封膠流動與時間的關係。但對於底部封膠流動時的邊界效應影響,則論述不夠完整,因此在數值模擬底部封膠充填時,無法以較完整的數學式描述實驗觀測到的現象。
本研究將在透明的覆晶試片中佈植錫鉛隆點,並更動覆晶試片的邊界條件與錫鉛隆點佈植區域,藉此來瞭解在不同錫鉛隆點間距下,毛細力與錫鉛隆點間距關係,與底部封膠充填時更動覆晶試片兩側邊邊界條件,所造成的影響。
Flip Chip interconnects are used in electronics industry and have inherent advantages over other methods due to its high interconnect density capability, small profiles and good performance. Due to the mismatch of the coefficients of thermal expansion (CTE) between the die and printed circuit board (PCB), the solder joints tend to fail by high thermal stresses. To enhance the reliability of the solder joints, underfill encapsulation is filled to the gap between the chip and substrate around the solder joints by a capillary flow. This underfill material is used to decrease the mismatch between die and PCB. The underfilling process must be carried out carefully to ensure good quality of wetting around the solder joints without any flaws as voids and streaks. Several studies were conducted to investigate the filling flow both in simulation and experiments. However, studies considering boundary effect of the underfill filling process were not reported. In this study, we tried to construct transparent flip chip samples and used this samples to observe the effect of the underfilling flow under different solder bump pitch and different boundary condition.
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