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2011 12th Intl. Conf. on Thermal, Mechanical & Multi-Physics Simulation and Experiments in Microelectronics and Microsystems最新文献

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Electromigration, fuse and thermo-mechanical performance of solder bump versus Cu pillar flip chip assemblies 电迁移,熔断器和热机械性能的焊料碰撞与铜柱倒装芯片组件
B. Vandevelde, R. Labie, V. Cherman, T. Webers, C. Winters, E. Beyne, F. Dosseul
Two different flip chip bump configurations have been investigated in terms of their thermo-mechanical, electromigration and fusing behaviour. Standard SAC (SnAgCu) solder bumps with a Ni/Au finish on the chip side are compared with Cu pillar bumps soldered with a thin layer of SnAg alloy. For the test structure, the flip chip assembly is integrated in a BGA package. Finite Element Modelling is used to support the experimental work and explain some of the conclusions.
研究了两种不同的倒装芯片碰撞结构的热力学、电迁移和熔合行为。标准SAC (SnAgCu)焊料凸点与芯片侧Ni/Au涂层的铜柱凸点进行了比较,并焊接了一层薄薄的SnAg合金。对于测试结构,倒装芯片组件集成在BGA封装中。有限元模型被用来支持实验工作和解释一些结论。
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引用次数: 2
Electrothermal prediction model of Cu low k interconnection on glass substrate 玻璃基板上Cu -低k互连的电热预测模型
L. Siegert, G. Fiannaca, F. Roqueta, G. Gautier, C. Anceau
The aim of this work is to determine a joule heating prediction model for thick copper/Low-k interconnects on glass substrate technology. Experiments and simulations have been used to define thermal conductivities of our stack material from thermal resistance study. In a second time, the thermal resistance is used as quantitative response to predict the joule temperature in the strip. The experimental Rthermic results are well fit with a quadratic model which combined with the thermal coefficient of resistance formalism; allow us to define an analytical temperature joule heating formula. This methodology to define an analytical joule heating formula can be widely used to determine the maximum operating conditions and can be implemented in design rules manuals.
本工作的目的是确定玻璃基板上厚铜/低k互连技术的焦耳加热预测模型。通过热阻研究,用实验和模拟方法确定了堆材料的导热系数。第二次用热阻作为定量响应来预测带材的焦耳温度。实验结果与结合热阻系数的二次模型拟合较好;允许我们定义一个解析的温度焦耳加热公式。这种定义解析焦耳加热公式的方法可广泛用于确定最大工作条件,并可在设计规则手册中实施。
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引用次数: 0
Simulation of lateral effect in emitter region of silicon solar cells for concentrated sunlight 聚光硅太阳能电池发射极区侧向效应的模拟
A. Alimardani, N. Manavizadeh, A. Afzali-Kusha, E. Asl-Soleimani
The loss due to lateral current flow in top diffused layer is one of the most important mechanisms of loss associated with top contacts and can be a limiting factor causing the reduction of cell efficiency especially for cells made to operate at high sun concentrations, because of higher level of current density and voltage drop. To optimize the design of grid contact, it is necessary to know the exact distributions of voltage and lateral and vertical current densities. In this work, a common structure of silicon solar cell is simulated at different levels of sun light concentrations where the lateral current density and voltage distributions are examined for different depths of emitter layer and bias voltages. In addition, the effect of lateral distribution of diffused layer on output power and efficiency for different illuminations is described. Also voltage and lateral current distributions in two bias voltages (maximum power voltage and open circuit voltage) and the influence of illumination are modeled by some analytical functions.
由于顶部扩散层的横向电流流动造成的损耗是与顶部触点相关的最重要的损耗机制之一,并且可能是导致电池效率降低的限制因素,特别是对于在高太阳浓度下工作的电池,因为更高的电流密度和电压降。为了优化栅极接触的设计,有必要了解电压、横向和纵向电流密度的确切分布。在这项工作中,模拟了一种常见的硅太阳能电池结构在不同水平的太阳光浓度下,研究了不同发射层深度和偏置电压下的横向电流密度和电压分布。此外,还讨论了不同照度下扩散层的横向分布对输出功率和效率的影响。用一些解析函数模拟了两个偏置电压(最大功率电压和开路电压)下的电压和侧电流分布以及光照的影响。
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引用次数: 0
Board level flat and vertical drop impact reliability for wafer level chip scale package 板级平面和垂直跌落影响晶圆级芯片规模封装的可靠性
R. Qian, Y. Liu, Jihwan Kim, S. Martin
In this paper, a comprehensive modeling is carried out to investigate the dynamic behaviors of WL-CSP subjected to both flat and vertical drop impacts. The non-linear dynamic properties include solder, Cu pad and the metal stacking under the UBM. Both of the JEDEC standard flat drop test and the vertical drop test modeling for different solder bump height are studied. The results showed that, in the JEDEC standard flat drop test, Stress of the corner balls at each WL-CSP is much higher than the balls in other locations on the same components. The results showed the vertical drop stress is lower than the flat drop stress. The result of JEDEC standard flat drop test modeling showed that the higher solder joint of the WL-CSP can result in lower plastic impact energy but higher tensile (first principal) stress S1 at solder joint.
本文对WL-CSP在平面和垂直跌落冲击下的动力学行为进行了综合建模研究。非线性动态特性包括钎料、铜垫和金属在UBM下的堆积。研究了JEDEC标准跌落试验和不同凸点高度下的垂直跌落试验模型。结果表明,在JEDEC标准平落试验中,各WL-CSP角球的应力均远高于同一构件上其他位置的角球。结果表明,垂直跌落应力小于平面跌落应力。JEDEC标准跌落试验模型结果表明,焊点质量分数越高,焊点的塑性冲击能越低,但焊点处的拉伸(第一主)应力S1越高。
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引用次数: 4
Local strength measurement technique for miniaturised silicon-based components 小型化硅基元件局部强度测量技术
M. Deluca, R. Bermejo, M. Pletz, M. Morianz, J. Stahr, P. Supancic, R. Danzer
The ongoing trend to further miniaturise electronic devices in Printed Circuit Board (PCB) technologies has pointed out the embedding of components as a principal design strategy. The reliability of the PCB relies on the functionality of the embedded components as well as on their structural integrity in order to survive the embedding process. In the present work, the biaxial strength of metallised silicon chips used in PCB technologies has been tested on both the substrate and the metallised side, evidencing a significant influence of the metallic contacts on the strength and the mechanical reliability of the component. Specimens tested with the metallised side under tension underwent an early failure (lower fracture load), whereby a statistical analysis of the strength distribution evidenced the presence of a narrower critical defect size distribution (i.e. higher mechanical reliability). This phenomenon was explained by means of (i) finite elements (FE) simulations of the loading conditions, and (ii) Focussed Ion Beam (FIB) analyses of the metal-silicon interface. It was concluded that the presence of a stress concentration in the interfacial area during loading induces pre-cracks which can act as critical defects upon load enhancement, thus causing failure for a very well defined range of loads.
在印刷电路板(PCB)技术中,电子器件进一步小型化的趋势指出,嵌入元件是一种主要的设计策略。PCB的可靠性依赖于嵌入组件的功能以及它们的结构完整性,以便在嵌入过程中幸存下来。在目前的工作中,在PCB技术中使用的金属化硅芯片的双轴强度已经在基板和金属化侧进行了测试,证明金属接触对组件的强度和机械可靠性有重大影响。在拉伸下,金属化侧的试样经历了早期的破坏(较低的断裂载荷),因此强度分布的统计分析证明了存在更窄的临界缺陷尺寸分布(即更高的机械可靠性)。这一现象通过(i)加载条件的有限元(FE)模拟和(ii)金属硅界面的聚焦离子束(FIB)分析来解释。由此得出结论,加载过程中界面区域应力集中的存在导致了预裂纹,而预裂纹在加载增强时可以作为关键缺陷,从而导致在一个非常明确的载荷范围内失效。
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引用次数: 4
Hydrogen-passivated graphene antidot structures for thermoelectric applications 热电应用的氢钝化石墨烯反点结构
H. Karamitaheri, M. Pourfath, R. Faez, H. Kosina
In this work, we present a theoretical investigation of the thermal conductivity of hydrogen-passivated graphene antidot lattices. Using a fourth nearest-neighbor force constant method, we evaluate the phonon dispersion of hydrogen-passivated graphene antidot lattices with circular, hexagonal, rectangular and triangular shapes. Ballistic transport models are used to evaluate the thermal conductivity. The calculations indicate that the thermal conductivity of hydrogen-passivated graphene antidot lattices can be one fourth of that of a pristine graphene sheet. This reduction is stronger for right-triangular and iso-triangular antidots among others, all with the same area, due to longer boundaries and the smallest distance between the neighboring dots.
在这项工作中,我们提出了氢钝化石墨烯反点阵的导热性的理论研究。利用第四近邻力常数法,我们评估了圆形、六边形、矩形和三角形氢钝化石墨烯反点晶格的声子色散。用弹道输运模型来计算导热系数。计算表明,氢钝化石墨烯反点阵的导热系数可以是原始石墨烯片的四分之一。由于边界较长,相邻点之间的距离较小,因此对于具有相同面积的直角三角形和等三角形反点来说,这种减少更强。
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引用次数: 0
Impact of the solder joint ageing on IGBT I–V characteristics using 2D physical simulations 利用二维物理模拟研究焊点老化对IGBT I-V特性的影响
E. Marcault, M. Breil, A. Bourennane, P. Tounsi, P. Dupuy
Based on 2D mechanical and physical simulations, we explore the impact of solder joint ageing at the origin of power assembly failures, on the electrical characteristics of multi IGBT cells. Electrical characteristics variations are analyzed with the aim of using them for health monitoring of embedded power assemblies.
基于二维力学和物理模拟,我们探讨了电源组件故障起源处的焊点老化对多个IGBT电池电气特性的影响。分析了电特性变化,目的是将其用于嵌入式电源组件的健康监测。
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引用次数: 3
Thermal transient analysis of LED array system with in-line pin fin heat sink 直插式引脚翅片散热器LED阵列系统的热瞬态分析
Fengze Hou, Daoguo Yang, G.Q. Zhang, Yang Hai, Dongjing Liu, Lei Liu
In this paper, a 3 W high power LED array system with an in-line pin fin heat sink is designed, fabricated, and investigated for thermal transient analysis. Preliminary finite element simulation is conducted by ANSYS, and LED array average junction temperature is about 40.9°C. In the experiment, electrical test method is used to evaluate the heat dissipation effect of the LED array system. Experiment results show that the system works well. The cumulative thermal resistance of the system is about 6.7K/W, and corresponding LED array average junction temperature is about 40.5°C. It is found that the simulation result is consistent with the experimental result. The error is about 1%. It is also found that, in order to get accurate thermal resistance of every kind of material in the heat flow path, we should analyze the curves of cumulative and differential structure function simultaneously.
本文设计、制作了一种具有直插式引脚翅片散热器的3w大功率LED阵列系统,并对其进行了热瞬态分析。利用ANSYS进行初步有限元仿真,LED阵列平均结温约为40.9℃。在实验中,采用电气测试的方法对LED阵列系统的散热效果进行了评价。实验结果表明,该系统运行良好。该系统的累积热阻约为6.7K/W,对应的LED阵列平均结温约为40.5℃。仿真结果与实验结果吻合较好。误差约为1%。研究还发现,为了准确得到各种材料在热流路径上的热阻,需要同时分析累积结构函数和微分结构函数的曲线。
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引用次数: 13
Non-equilibrium molecular dynamics simulation of heat transfer in carbon nanotubes - verification and model validation 碳纳米管传热的非平衡分子动力学模拟——验证和模型验证
T. Falat, B. Platek, J. Felba
Currently there is a lot of ongoing research towards estimation the thermal conductivity of carbon nanotubes (CNT). In the current paper thermal conductivity of SWNT were studied by using non-equilibrium molecular dynamics (NEMD) simulations (implemented in Materials Studio software, Accelerys Inc.). The NEMD technique is a direct approach which includes the computation of heat transport coefficients from flux-force relations, analogous to the macroscopic definition in irreversible thermodynamics. Simulations in nano- and atomic-scale can cause problems with model validation and with algorithm verification. The novel approach based on simulation of known material such as silicon were applied. The current paper focuses on the obtained results of model validation and verification of simulation algorithm.
目前,对碳纳米管的热导率进行了大量的研究。在当前的论文中,我们使用非平衡分子动力学(NEMD)模拟(在Materials Studio软件,Accelerys Inc.中实现)研究了SWNT的导热性。NEMD技术是一种直接的方法,它包括从通量-力关系计算热传递系数,类似于不可逆热力学中的宏观定义。在纳米和原子尺度上的模拟可能会导致模型验证和算法验证的问题。采用了基于硅等已知材料模拟的新方法。本文的重点是模型验证和仿真算法验证的结果。
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引用次数: 4
FEA study on electrical interconnects for a power QFN package 电源QFN封装电气互连的有限元分析
E. Almagro, B. B. Hornales, Marvin R. Gestole
This paper presents the results of a numerical analysis on the electrical interconnect options of a Power QFN (PQFN) package, to explore and compare the RDS(ON) performance at DC condition. The modeling involves the PQFN 5mm × 6mm package which initially uses Aluminum wire bonds for interconnection. Competition in the market in terms of better electrical performance packages challenge semiconductor companies to venture into new technology, innovation, process, wafer fabrication, package design changes. For the PQFN, apart from having a thin die with low specific RDS(ON), it is necessary to choose an interconnect which is also electrically efficient. Among the choices aside from the traditional Aluminum round wires are Aluminum ribbon bonding and Cu clip bonding. The comparison is purely based on the electrical performance and the study does not include the cost factors and other material related effects such as stress performance, etc. A commercial FEA code, ANSYS®, is utilized in this study while Solidworks® is used for CAD.
本文介绍了Power QFN (PQFN)封装的电气互连选项的数值分析结果,以探讨和比较直流条件下的RDS(on)性能。建模涉及PQFN 5mm × 6mm封装,最初使用铝线键进行互连。在更好的电气性能封装方面的市场竞争挑战半导体公司冒险进入新技术,创新,工艺,晶圆制造,封装设计的变化。对于PQFN,除了具有低特定RDS(ON)的薄芯片外,还需要选择一种也具有电效率的互连。除了传统的铝圆线外,还可以选择铝带键合和铜夹键合。比较是纯粹基于电气性能,研究不包括成本因素和其他材料相关的影响,如应力性能等。本研究使用商业有限元分析软件ANSYS®,而CAD则使用Solidworks®。
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引用次数: 0
期刊
2011 12th Intl. Conf. on Thermal, Mechanical & Multi-Physics Simulation and Experiments in Microelectronics and Microsystems
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