Assertion: semiconductor's conductivity | /r/HasProperty | due
Facets:
value: to holes
type: CAUSE
value: to minor concentrations of impurities
type: CAUSE
Source sentences:
text: In 1930, B. Gudden stated that conductivity in semiconductors was due to minor concentrations of impurities.
text: As the conductivity of Ge doped with indium is due to holes, it is called a p-type semiconductor.