Method of forming a bonding pad
First Claim
1. A method of forming an improved bonding pad in a bonding pad area on a substrate, the steps comprising:
- forming broken stripes on a substrate in a pattern in at least said bonding pad area forming an irregular top surface configuration,forming a conformal dielectric layer over said broken stripes in at least said bonding pad area thereby propagating said irregular top surface configuration and said pattern in said conformal dielectric layer,forming a conformal barrier layer over said dielectric layer whereby said underlying irregular top surface configuration and pattern are propagated in said barrier layer surface,depositing a metal layer over said barrier layer,forming a passivation layer over said metal layer, andforming a window in said passivation layer over said bonding pad area.
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Accused Products
Abstract
A structure and a process for forming an improved bonding pad which allows better bonding between a bond wire and a metal bonding pad. Stripes are formed on a substrate. A conformal dielectric layer, a conformal barrier layer and a metal layer are formed over the stripes. A passivation layer with a window is formed defining a bonding pad area. The stripes promote an irregular surface in the barrier and metal layers which reduce stress between the dielectric layer, the barrier layer and the metal layer. Also, the irregular surfaces increase the barrier metal adhesion to the dielectric layer, reduce bond pad peel off, and increase bonding yields.
34 Citations
20 Claims
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1. A method of forming an improved bonding pad in a bonding pad area on a substrate, the steps comprising:
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forming broken stripes on a substrate in a pattern in at least said bonding pad area forming an irregular top surface configuration, forming a conformal dielectric layer over said broken stripes in at least said bonding pad area thereby propagating said irregular top surface configuration and said pattern in said conformal dielectric layer, forming a conformal barrier layer over said dielectric layer whereby said underlying irregular top surface configuration and pattern are propagated in said barrier layer surface, depositing a metal layer over said barrier layer, forming a passivation layer over said metal layer, and forming a window in said passivation layer over said bonding pad area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for forming a bonding pad on a bonding pad area on a substrate comprising:
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forming stripes of a material on the substrate in a least the bonding pad area, the stripes arranged in a pattern of broken structures; forming a dielectric layer over the stripes in at least the bonding pad area, the dielectric layer having an upper dielectric surface having a non-planar topography which protrudes over the stripes; and forming a conducting region over the dielectric layer, the conducting region having an upper conducting surface having irregular topography which protrudes over the stripes. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for forming a bonding pad on a bonding pad area on a substrate comprising:
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forming stripes of a material on the substrate, the stripes comprising broken structures extending across at least a portion of the bonding pad area; forming a dielectric layer over the substrate and over the stripes in the bonding pad area, the dielectric layer having an upper dielectric surface having dielectric protrusions caused by the stripes; forming a barrier layer over the dielectric layer, the barrier layer having an upper barrier surface having barrier protrusions caused by the dielectric protrusions; forming a metal layer over the barrier layer, the metal layer having an upper metal surface having metal protrusions caused by the barrier protrusions; forming a passivation layer over the conducting region and providing an opening over at least a portion of the bonding pad area. - View Dependent Claims (20)
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Specification