Patent ID: 6545331
Filing Date: 2003-04-08
Classification: H01L

Abstract:
A solid state imaging device comprising:(a) a unit pixel including (1) a first semiconductor layer, (2) a second semiconductor layer of one conductivity type on said first semiconductor layer, (3) a well region of an opposite conductivity type formed in said second semiconductor layer, (4) a photodetection diode including (i) an impurity region of said one conductivity type extending from contact with a surface of said well region to contact with a surface of said second semiconductor layer, and (5) an insulated gate field effect transistor located adjacent to said photodetection diode, and including (i) a source region of said one conductivity type formed on said surface of said well region, (ii) a drain region of said one conductivity type formed on said surface of said well region and connected to said impurity region; (iii) a channel region between said source and drain regions, (iv) a gate electrode formed above said channel region by interpolating a gate insulating film, and (v) a buried layer having a high concentration of said opposite conductivity type formed in said well region near said source region under said channel region; (b) an element isolation insulating film positioned to isolate adjacent unit pixels from each other; and (c) an element isolation region of said opposite conductivity type, contacting a lower surface of said element isolation insulating film, isolating said second semiconductor layer and contacting said first semiconductor layer.