Patent ID: 9077920
Filing Date: 2015-07-07
Classification: H04N

Abstract:
1. A solid-state image pickup device comprising: a semiconductor substrate having a top surface, a doped region of the semiconductor substrate being of a first conductivity type; a first well region of a second conductivity type touching said top surface and a second well region of the second conductivity type, said second well region touching said first well region and said doped region; an accumulation layer of the second conductivity type touching said top surface and a first layer of the first conductivity type, said first layer touching said accumulation layer and said second well region, wherein an impurity concentration of the second conductivity type in said second well region is lower than an impurity concentration of the second conductivity type in said first well region, said first well region touching said accumulation layer and said first layer; a floating diffusion unit of the first conductivity type extending from said to surface into said first well region; wherein a transfer channel is a portion of the first well region, said transfer channel being between said first layer and said floating diffusion unit.