Patent ID: 7423305
Filing Date: 2008-09-09
Classification: H01L

Abstract:
1. A MOS solid-state image sensing device comprising: a plurality of pixels, each pixel comprising: a photoelectric conversion unit which includes, sequentially from a light incident side, a first semiconductor region of a first conductivity type, a second semiconductor region of a second conductivity type opposite to the first conductivity type, a third semiconductor region of the second conductivity type having an impurity concentration lower than that of said second semiconductor region, and a fourth semiconductor region of the first conductivity type; a floating diffusion region of the second conductivity type having an impurity concentration higher than that of the third semiconductor region; a transfer gate electrode for transferring electrical charges generated at said photoelectric conversion unit to said floating diffusion region; and an amplifying element for amplifying a signal based on electrical charges generated at said photoelectric conversion unit and outputting an amplified signal; an element isolation region made of an insulating material and disposed between adjacent pixels; a fifth semiconductor region of the first conductivity type disposed under said transfer gate electrode; and a sixth semiconductor region of the first conductivity type disposed under said element isolation region, wherein said fourth semiconductor region and said fifth semiconductor region are disposed continuously, wherein said fourth semiconductor region and the sixth semiconductor region are disposed continuously, and wherein a potential barrier to the electrical charges is provided by each of said fourth, fifth, and sixth semiconductor regions.