The TFT 6, wherein when {HEAD ~ the first impurity} is {TAIL ~ a group V recipient} the second impurity is a group III donor 
is
The TFT 6 , wherein when { HEAD ~ the first impurity } is { TAIL ~ a group V recipient } the second impurity is a group III donor
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH