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