Patent ID: 6448596
Filing Date: 2002-09-10
Classification: H01L

Abstract:
A solid-state imaging device for detecting a light signal by modulating a threshold voltage, comprising a plurality of pixels arranged, each of the pixels including a photo diode and an insulated gate field effect transistor for light signal detection adjacent to the photo diode, which are formed in a well region, the insulated gate field effect transistor for light signal detection provided with:(a) a ring-shaped gate electrode formed on a gate insulating film; (b) a source region formed in the well region inside an inner peripheral part of the gate electrode; (c) a drain region formed in the well region outside an outer peripheral part of the gate electrode; (d) a channel region formed below the gate electrode between the drain region and the source region; (e) a heavily doped buried layer formed in the well region below the channel region and near the source region, for storing the photo-generated charges generated by light irradiation at the photo diode, wherein a diffusing isolation region is provided between the adjacent pixels, has a same conductivity as that of the drain region, and is connected with the drain region.