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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Animesh anand
fo silicon type semiconductor it has 4 valance electron.when we dopped it with pentavalent atom an extra electron is left which is free and donate negative charge to lattice .so it is called donor type
why we take no of electrons eqaul to no of donor ions in n type ? here in this case nd=1 and ne are quite large than nd
there is misconception no.of electrons means no.of free electrons.