Patent ID: 6337495
Filing Date: 2002-01-08
Classification: H01L

Abstract:
A solid-state image pickup device comprising:a semiconductor substrate formed with a semiconductor well region on a principal surface side; a charge accumulation region column having a plurality of charge accumulation regions formed in the semiconductor well region, each of the charge accumulation regions having a conductivity type opposite to a conductivity type of the semiconductor well region; a charge transfer channel formed in the semiconductor well region adjacent to said charge accumulation region column and extending along said charge accumulation region column, said charge transfer channel having the conductivity type opposite to the conductivity type of the semiconductor well region; a readout gate channel formed in the semiconductor well region for each charge accumulation region, said readout gate channel having a conductivity type same as the conductivity type of the semiconductor well region and being contiguous to a corresponding charge accumulation region and said charge transfer channel; a channel stopper region formed in the semiconductor well region and extending at least along said charge accumulation region column on an opposite side of said charge transfer channel relative to a center line of said charge accumulation region column, said channel stopper region having the conductivity type same as the conductivity type of the semiconductor well region and an impurity concentration higher than an impurity concentration of the semiconductor well region; and a burying layer formed on each charge accumulation region and being separated from said readout gate channel and electrically connected to said channel stopper region, said burying layer together with the charge accumulation region constituting a photodiode, said burying layer including a high impurity concentration region having the conductivity type same as the conductivity type of the semiconductor well region, an impurity concentration of the high impurity concentration region being generally uniform and higher than the impurity concentration of said channel stopper region, and the high impurity concentration region being separated from said channel stopper region at least one area on the opposite side of said charge transfer channel relative to the center line of said charge accumulation region column.