Patent ID: 8791005
Filing Date: 2014-07-29
Classification: H01L,H05K,Y10T

Abstract:
1. A method of plating a structure comprising an opening etched in a nonmetallic material, a diffusion barrier deposited along a sidewall of the opening, and a conductive pad located at a bottom of the opening, the method comprising: depositing an alloying layer along the sidewall of the opening and in direct contact with the diffusion barrier, wherein the alloying layer comprises a crystalline structure that cannot serve as a seed for plating a conductive material; exposing the opening to an electroplating solution comprising the conductive material, wherein the conductive material is not present in the alloying layer; applying an electrical potential to a cathode causing the conductive material to deposit from the electroplating solution onto the cathode, and causing the opening to fill with the conductive material, wherein the cathode comprises the conductive pad and excludes the alloying layer; and forming a first intermetallic compound along an intersection of the alloying layer and the conductive material, the first intermetallic compound is formed as a precipitate within a solid solution of the alloying layer and the conductive material.