Patent ID: 9461007
Filing Date: 2016-10-04
CPC Classification: H01L

Claim Text:
1. A wafer-to-wafer bonding structure comprising: a first wafer comprising a first insulating layer on a first substrate and on a first copper (Cu) pad that penetrates the first insulating layer and has portions protruding from an upper surface of the first insulating layer, and a first barrier metal layer on a lower surface and sides of the first Cu pad; a second wafer comprising a second insulating layer on a second substrate and on a second copper (Cu) pad that penetrates the second insulating layer, has portions protruding from an upper surface of the second insulating layer, and is bonded to the first Cu pad, and a second barrier metal layer on a lower surface and sides of the second Cu pad; and a polymer layer on protruding sides of the first and second barrier metal layers and disposed between the first and second wafers.