In a preferred embodiment, {HEAD ~ the p type zinc oxide film} contains arsenic and is grown on {TAIL ~ a gallium arsenide substrate} 
is grown on
In a preferred embodiment , { HEAD ~ the p type zinc oxide film } contains arsenic and is grown on { TAIL ~ a gallium arsenide substrate }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL