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Research Papers

Bulk Resistance Evaluation of Anisotropic Conductive Adhesive Particles Considering the Current Bending Effect

[+] Author and Article Information
X. C. Chen, Z. P. Yin

State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering,  Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, Hubei 430074, China

Bo Tao1

State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering,  Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan, Hubei 430074, Chinataobo@mail.hust.edu.cn

1

Corresponding author.

J. Electron. Packag 134(3), 031007 (Jul 18, 2012) (8 pages) doi:10.1115/1.4006889 History: Received December 23, 2011; Revised May 04, 2012; Published July 18, 2012; Online July 18, 2012

Because it is difficult to accurately estimate the electric resistance of anisotropic conductive adhesive (ACA) joints, the ACA’s applications in high density packaging field have been greatly limited. The bulk resistance of particles is an essential part of the resistance of ACA joints. For the ACA using solid nickel (Ni) particles, because current flows along the spherical profile of the particles, the bulk resistance of these particles will be underestimated if the current bending effect is neglected. Here we propose a new method, which considers this current bending effect, to accurately evaluate the bulk resistance of Ni particles. First, a mathematical model to calculate the resistance of an arbitrary shaped resistor is deduced on the basis of electromagnetic theory. Second, a numerical model is introduced to calculate the potential distribution in the particles. Finally, the bulk resistance calculated by the new model is compared with the conventional methods. It is shown that the value obtained from this model is much higher than those calculated by other methods. Furthermore, the correlation studies between the bulk resistance and the particle’s diameter, the deformation degree, and the bonding force are carried out. And the results show that these three parameters influence significantly on the bulk resistance. In conclusion, to obtain accurate bulk resistance of ACA particles and make them stable and reliable, it is important to take the current bending effect into consideration and control the particle diameter and the bonding force properly.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 3

FE mesh of a particle for electric potential analysis

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Figure 4

Potential distribution of a particle (mV)

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Figure 5

Current lines in a particle (the values stand for current density, its unit is A/μm2 )

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Figure 1

Deformation of a solid Ni particle and the components of the resistance of an ACA joint

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Figure 2

Boundary conditions of a particle (Z axis is in the direction of current)

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Figure 6

Geometry model of the coaxial cylinders conductor and current lines in it

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Figure 7

Resistance of the coaxial cylinders conductor calculated by FEA (Eqs. 16,17)

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Figure 8

Comparison of bulk resistance of a particle calculated by the new method (Rwc) and the conventional method (Roc) (D=3μm)

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Figure 9

Relationships between deformation degree and bulk resistance

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Figure 10

Relationships between particle diameter and bulk resistance

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Figure 11

Y displacement of an ACA joint calculated by FEA when applying different bonding force

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Figure 12

Bonding force–bump displacement–deformation degree relationships (the geometry parameters are the same as those in Fig. 3)

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Figure 13

Relationship between bonding force and bulk resistance (D=3μm)

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