This is done by forming {TAIL ~ a pinned photodiode} which has {HEAD ~ a selective connection} to the substrate 
This is done by forming { TAIL ~ a pinned photodiode } which has { HEAD ~ a selective connection } to the substrate
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH