Patent ID: 7646047

Claim:
A solid-state imaging device comprising at least: a silicon layer in which a photo sensor portion to perform photo-electric conversion is contained, said silicon layer having a front-surface side and an oppositely facing rear-surface side; and a wiring layer on the front-surface side of said silicon layer, said wiring layer having at least one read out gate, wherein, the thickness of said silicon layer is 10 μm or less, said solid-state imaging device is configured to accept light via said rear-surface side of said silicon layer, said photo sensor portion comprises sensors configured to convert said light into signals representing an image, each of said sensors comprises (1) a relatively highly doped first conductivity type region adjacent to said front surface side of said silicon layer and serving as a charge storage region, (2) a first relatively lightly doped second conductivity type region extending from said charge storage region toward said rear-surface side of said silicon layer and serving as a photo sensitive region, (3) a second relatively highly doped second conductivity type region extending from said front surface side of said silicon layer toward said rear-surface side of said silicon layer and serving as a floating diffusion region, and (4) a relatively lightly doped region of said first conductivity type between said floating diffusion region and said charge storage region and under one of said at least one read out gate electrode and serving as a charge read out region, said charge storage region has a conductivity type opposite that of said photo sensor portion, and at least a portion of said photo sensitive region extends to and abuts said front-surface side of said silicon layer.