Patent ID: 8258595

Claim:
An image sensor comprising: a substrate comprising a first metal interconnection; a bonding silicon on the substrate, the bonding silicon comprising a plurality of impurity regions; an interlayer dielectric on the bonding silicon; a first contact plug penetrating the bonding silicon and electrically connected to the first metal interconnection; a second contact plug penetrating the interlayer dielectric and connected to a surface of the bonding silicon; a second metal interconnection on the interlayer dielectric, the second metal interconnection being connected to the second contact plug; and a color filter layer and a microlens over the second metal interconnection, wherein the plurality of impurity regions comprises a first impurity region, a second impurity region at one side of the first impurity region, a third impurity region on another side of the first impurity region, and a fourth impurity region at an, upper side of the first impurity region; wherein the first contact plug penetrates the second impurity region such that the second impurity region contacts sides of the first contact plug.