Patent ID: 7927990
Filing Date: 2011-04-19
Classification: H01L

Abstract:
1. A method for depositing at least two metal layers on an underlying layer comprising: depositing a first metal layer on the underlying layer; masking the first metal layer such that the first metal layer includes a first masked portion and a first unmasked portion; etching the first metal layer such that the first unmasked portion is removed to the underlying layer; depositing a first intermediate layer on the first metal layer and on the underlying layer; depositing a second metal layer on the first intermediate layer; planarizing the second metal layer to coexpose the first intermediate layer and the second metal layer at a first substantially planar surface; masking the second metal layer and the first intermediate layer such that the second metal layer and the first intermediate layer include a second masked portion and a second unmasked portion; etching the second unmasked portion to the underlying layer; depositing a second intermediate layer on all etched surfaces; and planarizing the second intermediate layer to coexpose the second intermediate layer and the first metal layer at a second substantially planar surface.