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