A multilevel sub-modeling approach to evaluate 3D IC packaging induced stress on hybrid interconnect structures
Multilevel sub-modeling was used to investigate CPI for 3D stacks with hybrid BEOL. Positions in the die at edge and the at center of Cu Pillar were investigated. BEOL integrated in OSG2.5 at the edges of Cu Pillar shows tensile stress in via 6. We found that package deformation induces compressive stress in interconnect BEOL. Simulations show that hybrid structures with SiO2 show high tensile stress regardless to the position in the die.
hybrid interconnect structures finite element modeling chip package interaction