4)
Note that the crystal maintains an overall charge neutrality
as the charge of additional charge carriers is just equal and
opposite to that of the ionised cores in the lattice In extrinsic semiconductors, because of the abundance of
majority current carriers, the minority carriers produced
thermally have more chance of meeting majority carriers and
thus getting destroyed Hence, the dopant, by adding a large number of
current carriers of one type, which become the majority carriers, indirectly
helps to reduce the intrinsic concentration of minority carriers The semiconductor’s energy band structure is affected by doping