Patent ID: 9209122
Filing Date: 2015-12-08
Classification: H01L

Abstract:
1. A bump including a diffusion barrier bi-layer, the bump comprising: a conductive layer; a first diffusion barrier layer formed on or above the conductive layer, and comprising an alloy of nickel and phosphorus; a second diffusion barrier layer formed on or above the first diffusion barrier layer, and comprising copper; a solder layer formed on or above the second diffusion barrier layer, and comprising tin; and an intermetallic Cu wherein a thickness of the first diffusion barrier layer ranges from about 1 μm to 1.6 μm, and a thickness of the second diffusion barrier layer ranges from about 0.5 μm to 0.8 μm, and wherein a thickness ratio of the first diffusion barrier layer and the second diffusion layer ranges from 1.2:1 to 2.5:1.