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