Patent ID: 7224003
Filing Date: 2007-05-29
Classification: H01L,Y10S

Abstract:
1. A solid-state image pickup apparatus incorporating a first-conduction-type well region formed on a semiconductor substrate, a photodiode section formed on the first-conduction-type well region and having a second-conduction-type region, a first-conduction-type surface layer formed on the second-conduction-type region of the photodiode section, a second-conduction-type drain region formed in the first-conduction-type well region adjacent to the second-conduction-type region of the photodiode section, and a gate section of a reading transistor formed above the first-conduction-type well region at a position between the second-conduction-type drain region and the second-conduction-type region of the photodiode section, the solid-state image pickup apparatus comprising: a first-conduction-type barrier well formed by an offset which extends from a deep portion in the second-conduction-type drain region toward the second-conduction-type region of the photodiode section, whose concentration is higher than a concentration of a first-conduction-type well layer, the first-conduction-type barrier well being formed at least at a lower part of the second-conduction-type drain region; and a second-conduction-type and high-concentration channel formation layer located at a position more adjacent to a surface layer than a position of the second-conduction-type barrier well, and also provided toward an end of the gate section.