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2016 17th International Conference on Electronic Packaging Technology (ICEPT)最新文献

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Thermal transfer influence of delamination in the die attach layer of chip-on-board LED package base on entropy generation analysis 基于熵生分析的片上LED封装贴片层分层对热传递的影响
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583216
Yuezhu Mo, D. Yang, M. Cai, Dongjing Liu, Y. Nie
From the perspective of the irreversible energy loss of the second law of thermodynamics, that is entropy generation, theoretical analysis on the influence of delamination appeared at the die attach (DA) layer on the chip junction temperature of high power LED-COB package is carried out. First, thermal simulation of chip-on-board LED package with different position of interface delamination is investigated. The results show that delamination occurs at the edge position is more harmful for blocking heat transfer in the overall LED package than that of the center position. Second, entropy generation of edge position and center position in die attach layer with non-delamination is calculated. In the same conditions, the entropy generation value of the edge position is larger than that of the center position, that is, compared to center position, the larger irreversible heat flux loss in the edge position of die attach in the heat conduction process is higher.
从热力学第二定律的不可逆能量损失即熵产的角度出发,对高功率LED-COB封装中贴片层(DA)出现的分层对芯片结温的影响进行了理论分析。首先,对不同接口分层位置的片上LED封装进行了热仿真研究。结果表明,边缘位置发生的分层对整个LED封装的传热阻碍比中心位置的分层更有害。其次,计算了无分层的模具附着层边缘位置和中心位置的熵生成;在相同条件下,边缘位置的熵产值大于中心位置的熵产值,即与中心位置相比,在热传导过程中,附片边缘位置较大的不可逆热流通量损失更高。
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引用次数: 5
Simulation research of the BGA configuration on the RF transmission performance BGA配置对射频传输性能的仿真研究
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583103
Bo Wang, Q. Ma, Liang Tang, Taoming Chen
In this paper, the potential influencing factors of BGA, such as shape, center distance and misalignment, were investigated and analyzed in the bands from DC to 20GHz by HFSS. In the model, two coplanar waveguide (CW) lines were connected by a half coaxial configuration which formed by five BGA balls. After the simulation, it was found that the transmission performance is significantly influenced by the BGA shape and the center distance between RF BGA and GND BGA. A cylinder-type BGA leads to the best transmission performance. Meanwhile, the simulation result also shows that the decentralization of RF BGA and the height of drum-type BGA are weak influencing factors.
在DC ~ 20GHz波段,利用HFSS对BGA的形状、中心距离和对中误差等潜在影响因素进行了研究和分析。在该模型中,两个共面波导(CW)线由5个BGA球组成的半同轴结构连接。仿真结果表明,BGA形状和射频BGA与地BGA之间的中心距离对传输性能有显著影响。气缸式BGA使传动性能达到最佳。同时,仿真结果还表明,射频BGA的分散性和鼓式BGA的高度是较弱的影响因素。
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引用次数: 5
Study on bumps deformation of flip chip bonding process 倒装芯片键合过程中凸点变形的研究
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583259
Ye Lezhi, W. Zhiyue, Wang Jiapeng, Zhou Qizhou
The flip chip package is an advanced chip interconnection technology, which has become a main technology of high density package. This paper mainly studies the influence of bumps deformation in the flip chip bonding process on connection reliability, which provides theoretical reference for the flip bonding process. Bumps deformation is a key factor for the chip reliable connection in the flip chip bonding. Bonding force directly determines the bumps deformation. The quality of the bumps will affect the reliability of reflow soldering and under-fill processes. This paper builds a three-dimensional model of flip chip bonding. By the FEM simulation analysis, the relationship between bonding force and bumps deformation is studied. The process parameters are optimized by comparing the experimental data with simulation result. Finally, the reliability evaluation method of flip chip bonding is obtained, which can be used to guide the research and development of the bonding equipment.
倒装封装是一种先进的芯片互连技术,已成为高密度封装的主要技术之一。本文主要研究倒装片粘接过程中凸点变形对连接可靠性的影响,为倒装片粘接过程提供理论参考。在倒装芯片焊接中,凸点变形是影响芯片可靠连接的关键因素。粘接力直接决定凸起变形。凸起的质量将影响回流焊和欠填充工艺的可靠性。本文建立了倒装芯片键合的三维模型。通过有限元模拟分析,研究了粘结力与凸点变形的关系。通过实验数据与仿真结果的比较,优化了工艺参数。最后,得出了倒装片键合的可靠性评估方法,可用于指导倒装片键合设备的研究与开发。
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引用次数: 3
Study on the electromigration-induced failure mechanism of Sn-3.0Ag-0.5Cu BGA solder balls Sn-3.0Ag-0.5Cu BGA焊锡球电迁移失效机理研究
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583188
Yan Qiu, Mingliang L. Huang, A. Wu
The L-S electromigration (EM)-induced failure mechanism of Sn-3.0Ag-0.5Cu (SAC305) BGA solder balls was investigated. It is confirmed that temperature was becoming the most crucial factor to dominate the EM behavior. The high operation temperature caused the melting of the BGA solder balls in both the Cu/SAC305/Cu interconnects on PCB side and the Cu/SAC305/Ni interconnects on chip side. For the Cu/SAC305/Cu interconnects, an significant EM flux was induced under which the cathode Cu was excessively dissolved and a thick Cu-Sn IMC layer formed on the anode interface. For the Cu/SAC305/Ni interconnects, both Cu and Ni atoms could arrive to the opposite interface under concentration gradient and EM, resulting in the formation of Cu-Ni-Sn IMCs at both interfaces. However, the Ni UBM effectively inhibited the cathode consumption compared with the Cu UBM. The EM resistance of the Cu/SAC305/Ni interconnects is superior to that of the Cu/SAC305/Cu interconnects.
研究了Sn-3.0Ag-0.5Cu (SAC305) BGA焊料球的L-S电迁移失效机理。结果表明,温度正逐渐成为决定电磁行为的最关键因素。高工作温度导致PCB侧Cu/SAC305/Cu互连和芯片侧Cu/SAC305/Ni互连中的BGA焊点球熔化。在Cu/SAC305/Cu互连中,阴极Cu被过度溶解,阳极界面形成较厚的Cu- sn IMC层。对于Cu/SAC305/Ni互连,在浓度梯度和EM作用下,Cu和Ni原子都可以到达相反的界面,在两个界面上形成Cu-Ni- sn IMCs。然而,与Cu复合材料相比,Ni复合材料有效地抑制了阴极消耗。Cu/SAC305/Ni复合材料的耐电磁性能优于Cu/SAC305/Cu复合材料。
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引用次数: 1
Design and characterization of petaloid hollow Cu interconnection for interposer 花瓣状空心铜互连的设计与表征
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583303
Yanming Xia, Kuili Ren, Shengli Ma, Y. Guan, Han Cai, Rongfeng Luo, Jun Yan, J. Chen, Yufeng Jin
In this paper, a novel petaloid hollow Cu interconnection for interposer is presented, its stress can be released by free ends face to hollow Cu interconnection center, and its fabrication process for Si substrate and glass substrate are also presented. Stress distribution and Max. stress of interposer with petaloid hollow Cu interconnection comparison with normal TSV is simulated and analyzed by thermal-mechanical model. Typical electrical path composed of petaloid hollow Cu interconnection is modeled, coupling influences of structure changing and thermal vibration on its electrical property is analyzed.
本文提出了一种新型的花瓣状空心Cu互连介质,其自由端面向空心Cu互连中心释放应力,并介绍了其在Si衬底和玻璃衬底上的制作工艺。应力分布和Max。利用热力学模型对花瓣状空心铜互连夹层的应力进行了模拟分析,并与普通TSV进行了比较。建立了花瓣状空心铜互连的典型电路模型,分析了结构变化和热振动对其电性能的耦合影响。
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引用次数: 1
Research on the interfacial reaction and mechanism of Cu/Sn/Ni copper pillar bump Cu/Sn/Ni铜柱碰撞界面反应及机理研究
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583306
Li Rao, Fengtian Hu, Penghui Xu, A. Hu, Liming Gao, Ming Li, Wen Zhao
Copper pillar bump interconnect technology, with its good electrical properties and electromigration resistance, is becoming the next key technology for fine pitch interconnection of chips. The study of the effect of copper pillar bump size on the interfacial diffusion reaction has directive significance to the application of copper pillar bump. This paper focuses on the effect of size on the reliability of copper pillar bump. We use the multi-layer electroplating method to prepare Cu/Sn/Ni copper pillar bump sandwich structure with different diameters of Φ20μm and Φ100μm. We find that the reduction of bump size will promote the growth of interfacial intermetallic compound (IMC). A void growth model in the copper pillar bump is explored by investigating Kirkendall voids and the growth of IMC in Φ20μm Cu/20μmSn/Ni copper pillar bumps.
铜柱凹凸互连技术以其良好的电学性能和抗电迁移性能,正成为芯片细间距互连的下一个关键技术。研究铜柱凹凸尺寸对界面扩散反应的影响,对铜柱凹凸的应用具有指导意义。本文主要研究了尺寸对铜柱凸台可靠性的影响。我们采用多层电镀的方法制备了不同直径Φ20μm和Φ100μm的Cu/Sn/Ni铜柱凹凸夹层结构。研究发现,凹凸尺寸的减小会促进界面金属间化合物的生长。通过研究Φ20μm Cu/20μmSn/Ni铜柱凸起中Kirkendall孔洞和IMC的生长,探讨了铜柱凸起中孔洞的生长模型。
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引用次数: 0
One failure analysis of voltage stabilizing circuit 稳压电路的失效分析
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583159
Chuan Luo, Yongda Hu, S. Bao, Yongqiang Cui
In order to finding the reason why there is no output signal when the voltage signals inputted during the voltage stabilizing circuit module works, Scanning electron microscope and energy disperse spectroscopy were used to detecting the surface morphology and the internal composition. The analysis results show that it is the cold solder in the wire bonding caused by the inappropriate mounting depression that lead to the failure of this product, besides, Solder balls can be easily found in this circuit, Which would potential threat to it's stability. we could decrease the amount of the solder ball from the quality of solder and the condition of reflow.
为了找出稳压电路模块工作时输入的电压信号没有输出信号的原因,利用扫描电镜和能量分散光谱对其表面形貌和内部成分进行了检测。分析结果表明,该产品故障的主要原因是由于安装凹陷不合适导致的焊线冷焊,并且该电路中容易出现焊球,对其稳定性有潜在的威胁。可以从焊料质量和回流条件两方面来减少焊球的数量。
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引用次数: 0
Single crystal copper nanocrystallization and sintered with silver nanoparticles 单晶铜纳米化并与纳米银烧结
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583299
Zhou Wei, Z. Zhen, Chunqing Wang
Silver nano-particles (Ag NPs) Pastes has been attracted attention in recent years, and had achieved great success, such as sintered at low temperature and got high shear strength. However, few people pay attention to the substrate nanocrystallization, herein, with the method of wet etching, we got nanostructure substrate of single crystal copper. Following, measured the wetting angle (H2O) and sintered with Ag NPs. The nanostructure and sintered result were observed by Atomic Force Microscope (AFM), scanning electron microscope (SEM) and EDX respectively. The results show that the wetting angle of Cu nanostructure substrate become larger which caused by the higher surface energy of the nanostructure. Besides, at 250°C, the Cu substrate diffused into the silver layer, much lower than the traditional diffusion temperature, which also may be explained by the nano-effect. All the result show that the nanostructure substrate make contribution to the nano-joining.
银纳米颗粒(Ag NPs)糊体近年来受到了人们的关注,并取得了很大的成功,如低温烧结和高剪切强度。然而,很少有人关注衬底的纳米化,本文采用湿法刻蚀的方法,得到了单晶铜的纳米结构衬底。然后,测量润湿角(H2O),用Ag NPs烧结。采用原子力显微镜(AFM)、扫描电镜(SEM)和EDX对纳米结构和烧结结果进行了观察。结果表明,铜纳米结构衬底的润湿角增大而引起的表面纳米结构的能量就越高。此外,在250°C时,Cu衬底扩散到银层中,远低于传统的扩散温度,这也可能是纳米效应的原因。结果表明,纳米结构衬底对纳米连接有一定的促进作用。
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引用次数: 0
Applying novel non-destructive failure analysis techniques on the package related failures 应用新颖的无损分析技术对包装相关失效进行分析
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583383
C. H. Chu, Y. T. Lin, W. Hsu, C. T. Chang, P. S. Kuo, Y. Hsieh
Recently, lots R&D efforts are put on the 2.5D and 3D IC to make package smaller, thinner and with enhanced performance and functions. The complexity of the packaging structure makes the failure analysis a difficulty. When chip function is recovered back after decapsulation of the package. Technique and tools are required to catch the failure site before opening the package. In order to detailed investigate the root cause at packaging level, new tools with higher resolution and penetration capability are required to non-destructively tackle the failure. By utilizing TDR, 3D X-ray microscope and lock-in thermal emission microscope, failure site resulted from package process can be clearly revealed and the root cause can be identified by following physical failure analysis such as cross sectional FIB, SEM and TEM. Examples of failure cases will be discussed in this paper.
最近,在2.5D和3D IC上投入了大量的研发工作,使封装更小,更薄,并增强了性能和功能。封装结构的复杂性使其失效分析成为一个难点。当封装解封后芯片功能恢复时。打开包装箱前,需要掌握一定的技术和工具,以确定故障地点。为了在包装层面详细调查根本原因,需要具有更高分辨率和穿透能力的新工具来非破坏性地解决故障。利用TDR、3D x射线显微镜和锁定热发射显微镜,可以清晰地揭示封装过程中产生的失效部位,并通过断面FIB、SEM、TEM等物理失效分析,找出根本原因。本文将讨论失效案例的实例。
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引用次数: 2
The realization of big networking and cloud computing dream from contact interconnect methodology to process technology (Part 2) 从接触式互连方法学到过程技术实现大网络和云计算梦想(下)
Pub Date : 2016-08-01 DOI: 10.1109/ICEPT.2016.7583099
Paul Wang, David He, Goterry Mai, D. Chung, Don Kearns
This article is Part 2 of a series of studies on new generation of electronic challenges and interconnect process technologies for networking computer products. These products include core routers for service providers, edge and branch routers for enterprise networking companies, small switch and wireless router for commercial and SOHO (small and home office), as well as server and data storage for cloud computing applications at the data center. All these cloud computing products require high data speed in terabytes per second and high reliability for the new generation of mobile users, whenever and wherever they are. Super mobility and high reliability are the backbone for this big dream of internet anywhere.
本文是新一代电子挑战和联网计算机产品互连工艺技术系列研究的第2部分。这些产品包括服务提供商的核心路由器,企业网络公司的边缘和分支路由器,商业和SOHO(小型和家庭办公室)的小型交换机和无线路由器,以及数据中心云计算应用程序的服务器和数据存储。所有这些云计算产品都要求为新一代移动用户提供每秒tb级的高数据速度和高可靠性,无论他们在何时何地。超级移动性和高可靠性是实现无处不在的互联网这一伟大梦想的支柱。
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引用次数: 1
期刊
2016 17th International Conference on Electronic Packaging Technology (ICEPT)
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