After distributing {HEAD ~ a nonmetal element} in a region in the vicinity of a surface portion of a semiconductor layer, a metal film is deposited on {TAIL ~ the semiconductor layer} 
After distributing { HEAD ~ a nonmetal element } in a region in the vicinity of a surface portion of a semiconductor layer , a metal film is deposited on { TAIL ~ the semiconductor layer }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL