Patent ID: 6790757
Filing Date: 2004-09-14
Classification: H01L

Abstract:
A wire bonding method, comprising the steps of:forming a semiconductor substrate with a copper (Cu) interconnect material; fabricating a copper (Cu) bond pad from the interconnect material; depositing a homogenous tantalum (Ta) layer onto the substrate and over the copper (Cu) bond pad; patterning and etching the tantalum (Ta) layer, the tantalum (Ta) layer encapsulating the copper (Cu) bond pad; and bonding an aluminum (Al) wire to the tantalum (Ta) layer over the bond pad; and wherein a portion of the tantalum (Ta) layer forms an intermetallic bond with the copper (Cu) bond pad, and another portion of the tantalum (Ta) layer forms a tantalum aluminide (TaAl3) compound to intermetallically bond the aluminum wire to the tantalum (Ta) layer.