It is known in the semiconductor integrated circuit industry that alkali metal ions are desirably excluded from {TAIL ~ silicon dioxide films} used as metal oxide semiconductor transistor insulators and {HEAD ~ multilevel interconnection insulators}, because these positively charged ions are mobile when exposed to electric fields 
It is known in the semiconductor integrated circuit industry that alkali metal ions are desirably excluded from { TAIL ~ silicon dioxide films } used as metal oxide semiconductor transistor insulators and { HEAD ~ multilevel interconnection insulators } , because these positively charged ions are mobile when exposed to electric fields
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