Analysis of Stress Distribution in Au Micro-Interconnection by Polycrystalline Models

Journal of Computational Science and Technology

Takashi KAWAKAMI¹  Takayuki KITAMURA³  Takashi SUMIGAWA³  Yoshihiro KAWAMURA³  Tetsuya KUGIMIYA² 

[1] Toyama Prefectural University Faculty of Engineering;Toshiba Co Ltd, Research & Development Center;Kyoto University Graduate School of Engineering

关键词: Stress Concentration;    Stress Singularity;    Interface;    Anisotropy;    Finite Element Method;    Multi;    Crystal;    Statistical Evaluation;    Au;    Micro-interconnection;   

DOI  :  10.1299/jcst.3.159

学科分类：地球科学(综合)

来源: Japan Academy

【 摘 要 】

References(12)Cited-By(1)A gold (Au) micro-interconnection, which connects through-hole electrodes in a three-dimensional chip-stacking LSI, is composed of several tens of grains. If the size of the interconnection becomes small in comparison with the grain, the anisotropic property of grains influences mechanical reliability. In this study, the stress distribution in the Au micro-interconnection is investigated by finite element method (FEM) analysis. The crystallographic structure of the Au micro-interconnection is obtained by a three-dimensional simulation based on a nucleation and growth model. The FEM analysis shows that the stress is concentrated on the region near the micro- interconnection/substrate interface edge and that a stress singularity exists there. The stress distribution of the micro-interconnection varies because of microscopic factors, which are due to the shape and crystallographic orientation of grains. Statistical evaluations of plural analytical models show that the stress variation approximates a normal distribution.

【 授权许可】

Unknown