Patent ID: 6984817
Filing Date: 2006-01-10
Classification: H01L

Abstract:
1. A photodetector formed in an active area of a semiconductor substrate of a first conductivity type, including a MOS transistor and a photodiode, said transistor having a source region disposed on a first side of a channel region and a drain region disposed on a second side of the channel region, said photodiode being formed of the junction between the substrate and a region of a second conductivity type formed in a planar surface of the substrate and also forming the source region of the MOS transistor, a heavily-doped layer of a first conductivity type covering the source region and a portion of the substrate, wherein said source region has first and second sides, the first side of the source region being disposed between the second side of the source region and the channel region, the source region having a length extending between the first and second sides of the source region, a width in a direction orthogonal to the length and parallel to a top surface of the source region, and an opening filled by the portion of the substrate, the portion extending from a center of the second side of the source region, towards the channel region, the portion having a width, in the direction orthogonal to the length, that is narrower than the width of the source region.