Patent ID: 8841767
Filing Date: 2014-09-23
Classification: H01L,H05K,Y10T

Abstract:
1. A bump structure comprises at least: a substrate having a surface and a plurality of bond pads disposed on the surface, and each of the bond pads comprises an exposed surface and a ring wall; a plurality of under bump metallurgy layers formed on the bond pads, and each of the under bump metallurgy layers comprises a first peripheral wall; a plurality of copper bumps formed on the under bump metallurgy layers, and each of the copper bumps comprises a first top surface and a second peripheral wall; a connection layer formed on the first top surfaces of the copper bumps, the connection layer comprises a second top surface and a third peripheral wall and includes a nickel layer and a coupling layer, wherein the nickel layer is located between the copper bump and the coupling layer, a first distance is formed between the third peripheral wall and the second peripheral wall, and a second distance is formed between the third peripheral wall and the first peripheral wall; a first protective layer formed on the first peripheral walls of the under bump metallurgy layers, the second peripheral walls of the copper bumps, the third peripheral wall of the connection layer and the substrate, the first protective layer comprises a first covering section and a second covering section, wherein the substrate is covered with the first covering section, and the first peripheral walls of the under bump metallurgy layers, the second peripheral walls of the copper bumps and the third peripheral wall of the connection layer are covered with the second covering section; and a dielectric layer formed on the first protective layer, and the dielectric layer comprises a plurality of exposed openings to reveal the second top surface of the connection layer.