Aptina Proposes Backside PD

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.

Aptina Proposes Backside PD
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