Patent ID: 8476102

Claim:
A method for manufacturing a solid state image pickup device including: a plurality of pixels, each including a conversion unit to generate signal carriers and at least one pixel transistor to read signals based on the generated signal carriers, a first active region provided with a first conversion unit, a second active region provided with a second conversion unit, and a third active region adjoining the first and the second active regions with a field region therebetween and being provided with the pixel transistor, the method comprising: implanting first conductivity type impurity ions into the third active region in order to form a semiconductor region serving as a potential barrier against the signal carriers; and implanting second conductivity type impurity ions with energy lower than an implantation energy of the implanting of the first conductivity type impurity ions into a region serving as a channel portion of the pixel transistor in the third active region, wherein the first conductivity type is opposite of the second conductivity type, and wherein the channel portion of the pixel transistor is provided between a source region and a drain region of the pixel transistor.