Assertion: impurity's effect | /r/CapableOf | contaminate with iron
Facets:
value: intentionally
type: MANNER
Source sentences:
text: , studied the effect on silicon intentionally contaminated with iron (by addition of 53 ppm by weight of iron in the feedstock) and found that lifetime improvement with phosphorus gettering and hydrogenation could be up to 50 times in p-type silicon and only up to 5 times for n-type silicon.