Doping materials are called impurities because

doping materials are caled impurities because

In a transistor the base is made very than and is lightly doped with an impurity, because.

In a transistor the base is made very thin and is lightly doped with an impurity, because.

A group-14 element is to be converted into n-type semiconductor by doping it with a suitalbe impurity. To which group this impurity belong?

A group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong?