Patent ID: 6278487
Filing Date: 2001-08-21
Classification: H01L,H04N

Abstract:
A solid-state image sensing device comprising:a plurality of photoelectric conversion portions two-dimensionally arranged on one major surface of a semiconductor substrate of a first conductivity type;vertical charge transfer portions respectively arranged adjacent to said photoelectric conversion portions and having a first well layer of a second conductivity type and a first semiconductor region of the first conductivity type formed on said first well layer of the second conductivity type;a horizontal charge transfer portion arranged adjacent to one end side of said vertical charge transfer portions and having a second well layer of the second conductivity type and a second semiconductor region of the first conductivity type formed on said second well layer of the second conductivity type;an unwanted charge removing portion arranged adjacent to said horizontal charge transfer portion on a side opposite to said vertical charge transfer portions to remove an unwanted charge overflowing from said horizontal charge transfer portion, said unwanted charge removing portion having a third well layer of the second conductivity type, and a third semiconductor region of the first conductivity type formed on said third well layer of the second conductivity type; anda potential barrier portion formed between said horizontal charge transfer portion and said unwanted charge removing portion,wherein said first and third semiconductor regions of the first conductivity type are formed by the same step, having substantially identical impurity concentrations therein, and said second and third well layers of the second conductivity type are formed by the same step.