Patent ID: 6838716

Claim:
A CMOS image sensor comprising a pixel consisting of: a photodiode having an impurity region formed in semiconductor substrate; a first MOS transistor formed on said semiconductor substrate, the first MOS transistor having an impurity region as a drain connected to said impurity region of said photodiode; a second MOS transistor formed on said semiconductor substrate, the second MOS transistor having an impurity region as a source connected to a source of said first MOS transistor; and a third MOS transistor formed on said semiconductor substrate, the third MOS transistor having an impurity region as a source connected to a drain of said second MOS transistor, wherein an insulating film formed on the first, second and third MOS transistors, the insulating film having contact holes reaching the sources and drains of the first, second and third MOS transistors, a suicide film is not formed on a surface of the drain of the first MOS transistor, but the suicide film is formed on each surface of the sources and drains of the first, second and third MOS transistors except for the drain of the first MOS transistor.