Patent ID: 8766387

Claim:
A device comprising: a Backside Illumination (BSI) image sensor chip comprising: a first semiconductor substrate; an image sensor disposed on a front side of the first semiconductor substrate; and a first interconnect structure comprising a plurality of metal layers on the front side of the first semiconductor substrate; a device chip bonded to the image sensor chip, wherein the device chip comprises: a second semiconductor substrate; an active device on a front side of the second semiconductor substrate; and a second interconnect structure comprising a plurality of metal layers on the front side of the second semiconductor substrate; a first via penetrating through the BSI image sensor chip to connect to a first metal pad in the second interconnect structure; and a second via penetrating through a dielectric layer in the first interconnect structure to connect to a second metal pad in the first interconnect structure, wherein the first via and the second via are electrically connected.