Patent ID: 8278200

Claim:
A non-transitory computer-readable medium storing a program of instructions executable by a machine for performing operations, said operations comprising: depositing a first layer comprised of a first metal on a surface of a semiconductor structure, where depositing the first layer creates a first intermix region at an interface of the first layer and the semiconductor structure; removing a portion of the deposited first layer to expose the first intermix region; depositing a second layer comprised of a second metal on the first intermix region, where depositing the second layer creates a second intermix region at an interface of the second layer and the first intermix region; removing a portion of the deposited second layer to expose the second intermix region; and performing at least one anneal on the semiconductor structure, where no anneal is performed prior to removal of the portion of the deposited second layer where the removed portion of the deposited first layer comprises non-intermixed first metal, and where the removed portion of the deposited second layer comprises non-intermixed second metal.