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首页> 外文期刊>IEEE Transactions on Components and Packaging Technologies >Investigation of Mechanical and Electrical Characteristics for Cracked Conductive Particle in Anisotropic Conductive Adhesive (ACA) Assembly
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Investigation of Mechanical and Electrical Characteristics for Cracked Conductive Particle in Anisotropic Conductive Adhesive (ACA) Assembly

机译：各向异性导电胶（ACA）组件中破裂的导电颗粒的机械和电气特性的研究

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摘要

In an anisotropic conductive adhesive (ACA) assembly, the electrical conduction is usually achieved with the conductive particles between the bumps of integrated circuit (IC) and corresponding conductive tracks on the glass substrate. Fully understanding of the mechanical and electrical characteristics of ACA particles can help to optimize the assembly process and improve the reliability of ACA interconnection. Most conductive particles used in the ACA assembly are with cracks in the metal coating of the particles after the ACA bonding. This paper introduced the fracture analysis by applying the cohesive elements in the numerical model of the nickel-coated polymer particle and further simulating the cracks initiation and propagation in the nickel coating during the ACA bonding. The simulation results showed that the stress distribution on the nickel-coated particle with cracks was significantly different from that on the nickel-coated particle without crack, indicating that the stress analysis by taking the crack into consideration is very important for the reliability assessment of the ACA interconnection. The stress analysis of cohesive elements indicated that the cracks initiated at the central area of the nickel coating and propagated to the polar area. Furthermore, by the introduction of a new parameter of the virtual resistance, a mathematical model was established to describe the electrical characteristics of the nickel-coated particle with cracks. The particle resistance of the nickel-coated particle with cracks was found to be much higher than that of the particle without crack in the optimized bonding pressure range, indicating that it is necessary to take the crack into consideration for the particle conduction analysis as well. Therefore, the fracture analysis on the conductive particle by taking the crack into consideration could accurately evaluate the reliability of ACA interconnection and avoid serious reliability issues.
机译：在各向异性导电粘合剂（ACA）组件中，通常利用集成电路（IC）的凸块与玻璃基板上的相应导电迹线之间的导电颗粒来实现导电。全面了解ACA粒子的机械和电气特性可以帮助优化组装过程并提高ACA互连的可靠性。在ACA组装后，ACA组件中使用的大多数导电粒子在粒子的金属涂层中都有裂纹。本文通过在镍涂层聚合物颗粒的数值模型中应用内聚元素，并进一步模拟ACA粘结过程中镍涂层中的裂纹萌生和扩展，介绍了断裂分析。仿真结果表明，有裂纹的镀镍粒子与无裂纹的镀镍粒子的应力分布明显不同，这表明考虑裂纹的应力分析对于评估裂纹的可靠性非常重要。 ACA互连。内聚元素的应力分析表明，裂纹始于镍镀层的中心区域，并扩展到极性区域。此外，通过引入虚拟电阻的新参数，建立了数学模型来描述带有裂纹的镀镍颗粒的电特性。发现在优化的结合压力范围内，带有裂纹的镀镍颗粒的颗粒电阻远高于没有裂纹的颗粒，这表明在颗粒导电分析中也必须考虑到裂纹。因此，考虑到裂纹对导电颗粒的断裂分析可以准确地评估ACA互连的可靠性，避免严重的可靠性问题。

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