A semiconductor layer with {HEAD ~ a doping} of {TAIL ~ a second conductivity type} is applied at a surface of the semiconductor substrate 
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A semiconductor layer with { HEAD ~ a doping } of { TAIL ~ a second conductivity type } is applied at a surface of the semiconductor substrate
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH