Patent ID: 9032615
Filing Date: 2015-05-19
Classification: G06F,H01L,Y10T

Abstract:
1. A method of forming an electrical connection between a first metal layer and a second metal layer, wherein the second metal layer is over the first metal layer, comprising: forming a first via between the first metal layer and the second metal layer; obtaining a first measure of a number of vacancies expected to reach the first via, wherein the first measure of vacancies is a summation of an upper measure and a lower measure of vacancies expected to reach the first via, wherein the upper measure is of vacancies from the second metal layer and the lower measure is of vacancies from the first metal layer, and wherein the obtaining the upper measure of vacancies comprises: forming a second via in one of the group consisting of the first metal layer and the second metal layer if the first measure of vacancies exceeds a first predetermined number.