Consider the band diagram shown below for a semiconductor wh

Consider the band diagram shown below for a semiconductor which has been doped by a small concentration of donor dopants. Which material would expect to have the higher electronic conductivity? (Assume the semiconductor Is at room temperature and the dopant concentration exceeds the intrinsic carrier concentration) The pure (undoped) semiconductor. The same semiconductor doped with the donor dopant. Both will have the same conductivity. It Is Impossible to tell.

Solution

Ans C)The semiconductor doped with donor dopent will be more conductive.Semiconductor have 4 valence electrons hence when doped with donor element like Phosphorus which have 5 valence electron the 4 electron form loose bond with other 4 other Semiconductor electron while the fifth electron is loosely held which carry current in the semiconductor.