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標題: 溫度負載對於先進封裝微凸塊之剪切強度研究
Investigation of Shear Strength for the Microbump of Advanced Packages under Temperature Loads
作者: 蔡筑涵
Chu-Han Tsai
關鍵字: 微凸塊
copper pillar
temperature load
shear force
finite element
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摘要: 科技隨著輕量化與小型化的發展,封裝體的尺度也逐漸縮小到微米等級,近年來,傳統覆晶結構也逐漸由原本的錫球發展出銅柱凸塊結構,由於銅柱凸塊相較於傳統錫球在相同面積下可以有較高密度的排列,並且可以更容易的控制球高,因此,銅柱凸塊也開始被大量生產製造,然而,一直以來封裝體中焊點的強度對於整體結構的可靠度都是非常重要的,其中影響焊點強度有一個很重要的因素是溫度,另外,剪切試驗是最被廣泛使用來評估焊點強度的方法。因此,本研究將藉由剪切試驗針對不同的溫度負載對於微凸塊強度的影響作探討。 本研究於不同溫度下分別做高溫實驗以及高溫儲存老化實驗,而高溫推球會因溫度越高,使得材料軟化,剪切力越小的趨勢。高溫儲存老化中,隨著烘烤時間增加,銅柱中的殘留應力被釋放,剛開始增加了凸塊的強度,隨後強度因晶粒成長而降低,因此,剪切力產生先上升後下降的現象,另外,本研究也利用有限元素分析作推球模擬,得到了應力及應變皆集中於墊片兩側的結果,墊片兩側即為整個結構最弱的地方,當材料間的黏著強度不夠時,就會從該處破裂,為了節省研發成本,有限元素分析可以做為日後微凸塊結構設計之參考。
The development of technology is miniaturization and lightweight, and the scale of the package has gradually narrowed to the micron level. In recent years, the flip chip structure has developed the copper pillar bump structure from the traditional solder ball, due to the copper pillar bump has a higher density than solder ball in the same area, and copper pillar bump's height can be controlled easilier. Therefore, the copper pillar bump has begun to be mass-produced afterwards. However, the strength of the solder joints in the package is very important for the reliability of the overall structure. One of the most important factors is temperature. Shear test is the most widely method to be used to evaluate solder joint strength. This study will explore the shear strength for the microbump under temperature loads. In this study, high temperature experiments and high temperature storage aging were performed at different temperatures. Due to the higher temperature, microbump's material will be soften, and the shearing force tends to be smaller. During high temperature storage aging, as the baking time increases, the residual stress of the copper pillar will be released, and enhance the strength of the bump at first, and then the strength decreases due to grain growth. Therefore, the shear force of the copper pillar first rises and then falls. In addition, this study also uses finite element analysis as the push ball simulation, and the stress and strain are concentrated on both sides of the pad.Thay's the weakest part of the whole structure. When the adhesive strength between the materials is weak, it will fracture from there. In order to save the development costs, finite element analysis can be used as a reference for future microbump structure design.
文章公開時間: 2022-02-11
Appears in Collections:機械工程學系所



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