A pixel including a substrate of a first conductivity type, a
photodetector of a second conductivity type that is opposite the first
conductivity type and configured to convert incident light to a charge, a
floating diffusion of the second conductivity, and a transfer region
between the photodetector and floating diffusion. A gate is formed above
the transfer region and partially overlaps the photodetector and is
configured to transfer charge from the photodetector to the floating
diffusion. A pinning layer of the first conductivity type extends at
least across the photodetector from the gate. A channel region of the
first conductivity type extends generally from a midpoint of the gate at
least across the photodiode and is formed by an implant of a dopant of
the first conductivity and having a concentration such that a dopant
concentration of the transfer region is greater proximate to the
photodetector than proximate to the floating diffusion.