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