共查询到19条相似文献,搜索用时 93 毫秒
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用电镀法制备了尺寸小于100μm的面阵列Sn-3.0Ag凸点.芯片内凸点的高度一致性约1.42%,Φ100mm硅圆片内的高度一致性约3.57%,Ag元素在凸点中分布均匀.研究了不同回流次数下SnAg/Cu的界面反应和孔洞形成机理,及其对凸点连接可靠性的影响.回流过程中SnAg与Cu之间Cu6Sn5相的生长与奥氏熟化过程相似.SnAg/Cu6Sn5界面中孔洞形成的主要原因是相转变过程中发生的体积缩减.凸点的剪切强度随着回流次数的增多而增大,且多次回流后SnAg/Cu界面仍然结合牢固.Cu6Sn5/Cu平直界面中形成的孔洞对凸点的长期可靠性构成威胁. 相似文献
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用电镀法制备了尺寸小于100μm的面阵列Sn-3.0Ag凸点.芯片内凸点的高度一致性约1.42%,Φ100mm硅圆片内的高度一致性约3.57%,Ag元素在凸点中分布均匀.研究了不同回流次数下SnAg/Cu的界面反应和孔洞形成机理,及其对凸点连接可靠性的影响.回流过程中SnAg与Cu之间Cu6Sn5相的生长与奥氏熟化过程相似.SnAg/Cu6Sn5界面中孔洞形成的主要原因是相转变过程中发生的体积缩减.凸点的剪切强度随着回流次数的增多而增大,且多次回流后SnAg/Cu界面仍然结合牢固.Cu6Sn5/Cu平直界面中形成的孔洞对凸点的长期可靠性构成威胁. 相似文献
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铟凸点阵列通常被用于焦平面阵列与硅的读出电路间的倒装互连中。铟凸点制备技术是焦平面探测器制备的关键技术之一。本文阐述了一种基于电镀的铟凸点制备工艺流程;基于此流程,实验中成功制备出间距为100um,UBM直径为40um的16*16的焊球阵列。同时,实验中利用XRD技术对Ti/Pt对铟的阻挡性做出了研究,结果表明,Ti/Pt (300Å/200Å)在室温和200°C的温度下对铟均具有良好的阻挡性能。利用剪切力实验对铟凸点的可靠性做出了研究,实验结果表明,经过一次回流后,铟凸点的剪切有极大的变化,但之后增加回流次数,其剪切力变化不大,此现象可能与电镀铟内部的织构有关.本文也讨论了铟凸点的倒装工艺。 相似文献
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圆片级封装的无铅焊料凸点制作技术研究 总被引:1,自引:0,他引:1
对圆片级封装(WLP)的结构设计和关键工艺技术进行了研究;描述了凸点下金属(UBM)层的选择,凸点回流技术,以及凸点的质量控制技术;重点阐述了采用电镀制作无铅焊料凸点的方法. 相似文献
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MEMS压力传感器上柔性化凸点制备方法 总被引:1,自引:1,他引:0
介绍了一种适用于MEMS压力传感器的低成本、柔性化凸点下金属层(Under Bump Metal,UBM)和凸点(Bump)的制备工艺。其中凸点下金属层分为Ni-P/Cu两层,使用化学镀的方法沉积在Al焊盘表面;凸点通过焊膏印刷回流预制于陶瓷基片上,再通过转移工艺移植到焊盘上。为了检验此套工艺制出的凸点结构是否具有足够的强度,对凸点进行了剪切破坏试验。结果表明,凸点与凸点下金属层、凸点下金属层与Al焊盘均结合牢固,破坏主要发生在焊料凸点内最薄弱的金属间化合物层(Intermetallic Compound,IMC)。 相似文献
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喷镀系统在凸点制备中的应用 总被引:1,自引:0,他引:1
介绍了利用电镀法制造晶圆凸点的典型工艺和喷镀设备.喷镀系统是凸点电镀设备中最关健的部件.通过计算机软件模拟试验,对喷镀系统中的喷杯体和匀流板等各种参数和位置进行了优化设计,并在设备上应用验证.该系统在凸点电镀设备上应用后,在晶圆片上成功做出了高质量的均匀凸点,取得了良好效果. 相似文献
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This paper describes a technique that can obtain ternary Sn-Ag-In solder bumps with fine pitch and homogenous composition distribution.The main feature of this process is that tin-silver and indium are electroplated on copper under bump metallization(UBM) in sequence.After an accurate reflow process,Sn1.8Ag9.4In solder bumps are obtained.It is found that the intermetallic compounds(IMCs) between Sn-Ag-In solder and Cu grow with the reflow time,which results in an increase in Ag concentration in the solder area.So during solidification, more Ag2In nucleates and strengthens the solder. 相似文献
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讨论了LTCC工在板薄膜金属化技术中,有效阻碍层的选择对基板共晶焊的影响。实验结果表明,Ti/Ni是一种高可靠性的阻碍层,而且Ti/Ni/Au也是一种较理想的LTCC基板薄膜金属化结构。 相似文献
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Hsiao-Yun Chen Chih Chen Pu-Wei Wu Jia-Min Shieh Shing-Song Cheng Karl Hensen 《Journal of Electronic Materials》2008,37(2):224-230
Eutectic Sn-3.5wt.%Ag alloy is one of the most promising lead-free solders in low temperature processes for wafer bumping.
Near eutectic composition of deposited alloy films could be readily acquired by pulse electroplating with a proper combination
of active ingredients including K4P2O7, KI, Sn2P2O7, and AgI, as well as polyethylene glycol (PEG), with molecular weights of 200, 600, 2,000, and 4,000, as an inhibitive agent.
Pulse electroplating was carried out with current in alternating polarity to conduct electroplating and electropolishing sequentially.
As a result, alloy films with grains of less than 1 μm and uniform surface morphology can be obtained. The addition of PEG was necessary for the stabilization of the plating baths
to promote a wider process window for the desirable eutectic composition. Electrochemical characterization established that
PEG with molecular weight of 4,000 exhibited the strongest inhibition behavior. In contrast, PEG with molecular weight of
200 demonstrated the least interference. Energy dispersive X-ray and differential scanning calorimeter data confirmed the
formation of eutectic alloy as a function of deposition current density. X-ray diffraction results indicated that a biphasic
structures of β-Sn and ε-Ag3Sn was present in the as-deposited film. 相似文献
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伴随高密度电子组装技术的发展,BGA(Ball Grid Array)成为高密度、高性能、多功能及高I/O数封装的最佳选择。文章分析了影响BGA焊点可靠性的关键因素,特别提出了减少焊点空洞缺陷和提高剪切强度的主要措施,并通过试验优化出各工艺参数。结果表明:运用优化的工艺参数制作的BGA焊点,焊接空洞以及芯片剪切强度有了明显改善,其中对BGA焊接样品进行150℃、1000h的高温贮存后,焊点的剪切强度完全满足GJB548B-2005的要求。 相似文献
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研制开发熔点在260 ℃以上的高温无铅钎料来代替传统的高铅钎料运用于电子封装一直是钎焊领域的一大难题。熔点约为272 ℃的Bi-2.6 Ag-5 Sb钎料合金因润湿性和焊接可靠性不良在运用上受到限制。文中通过在Bi-2.6 Ag-5 Sb钎料合金中添加微量元素Cu来改善B-i2.6 Ag-5 Sb合金的润湿性及焊接可靠性。研究结果表明,Cu含量对BiAgSbCu系钎料合金熔点影响较小,当Cu含量为2 %时,润湿性及焊接可靠性最佳。 相似文献
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Sn-Ag-In系焊料的实用化与今后的课题 总被引:3,自引:0,他引:3
焊料合金低融点化是实现无铅化的关键技术。经研究表明,Sn-Ag-In系焊料在焊接可靠性方面能够满足要求,有广阔的应用前景。 相似文献
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Woong Ho Bang Choong-Un Kim Suk Hoon Kang Kyu Hwan Oh 《Journal of Electronic Materials》2009,38(9):1896-1905
This paper examines the mechanics of ball shear testing with the objective of understanding the mechanism by which the maximum
shear force and the rate of crack growth is dependent on the solder bump size. For this, Pb-Sn solder bumps with diameters
between 460 μm and 760 μm are soldered to 400 μm-diameter Cu pads and subjected to ball shear testing. In spite of the constant interface area, the bump size significantly
impacts the measured shear fracture force and the crack growth rate. Both the fracture force and the crack growth rate increase
with bump size, and in the case of the fracture force, the increase is almost linear. Our analysis finds that the linear increase
in the fracture force is a result of the bump deformation force, which increases with bump size. A simple model that accounts
for the deformation force component is developed and used to extract the true interface fracture force. The estimated true
interface fracture force is found to vary little with bump size, tightly converging to the 40 MPa to 48 MPa range. On the
other hand, the dependence of crack growth rate on bump size is found to result from the higher degree of rotational moment
associated with larger bumps. 相似文献