Patent ID: 9537040
Date: 2017-01-03
CPC Classifications: H01L

Claim:
1. A complementary metal-oxide-semiconductor (CMOS) image sensor comprising: a substrate having a pixel region and a periphery region defined thereon; a plurality of photosensitive elements formed in the pixel region; a first transistor positioned in the pixel region and electrically connected to one of the plurality of photosensitive elements; a second transistor positioned in the periphery region, and the second transistor comprising a gate electrode and a source/drain; a first conductive body positioned on the substrate in the pixel region, a top surface of the first conductive body is higher than a surface of the substrate, the first conductive body contacts the one of the plurality of photosensitive elements and protrudes from a surface of the one of the plurality of photosensitive elements; a first salicide layer formed on the first conductive body, the first salicide layer comprising an inverted-U shape, the first salicide layer being spaced apart from the one of the plurality of photosensitive elements by the first conductive body; a second salicide layer formed on the source/drain of the second transistor in the periphery region, and the second salicide layer directly contacting the source/drain of the second transistor; and at least a contact plug formed on and electrically connected to the first salicide, wherein a surface of the contact plug which is in direct contact with a top surface of the first silicide layer has a width less than a width of the first salicide layer, and the first salicide layer and the first conductive body being sandwiched in between the contact plug and the one of the plurality of photosensitive elements in the substrate.