Patent ID: 6778213
Filing Date: 2004-08-17
Classification: H01L,H04N

Abstract:
A solid-state image sensor including a photoelectric transfer section and a CMOS circuit section both formed on a common semiconductor substrate in accordance with a common process, said solid-state image sensor outputting a signal indicative of a variation in potential caused by electric charges generated in said photoelectric transfer section, said solid-state image sensor comprising:(a) a semiconductor substrate having a first electrical conductivity, a first voltage being applied to said semiconductor substrate; (b) a first well layer formed in said semiconductor substrate, said first well layer having a second electrical conductivity and defining photoelectric transfer section, a second voltage being applied to said first well layer in such a manner that said first well layer is inversely biased relative to said semiconductor substrate; (c) a second well layer formed in said semiconductor substrate, said second well layer having a first electrical conductivity and partially defining a CMOS circuit section, said second well layer having a junction with said semiconductor substrate, said first voltage being applied to said second well layer; and (d) a third well layer having a second electrical conductivity and partially defining said CMOS circuit section, said second voltage being applied to said third well layer in such a manner that said third well layer is inversely biased relative to said semiconductor substrate, said third well layer having the same concentration profile as that of said first well layer, and having a junction with said semiconductor substrate.