Aptina's patent application US20140077062 "Back side illuminated image sensors with back side charge storage" by Jaroslav Hynecek describes an unusual pixel idea - move the PD implant to the backside:
The advantages of such an approach are not clear to me, but it's a fresh idea and can work, if pixel is not too small and one can spare 10-20V to control the transfer gate Vtx.
The advantages of such an approach are not clear to me, but it's a fresh idea and can work, if pixel is not too small and one can spare 10-20V to control the transfer gate Vtx.
