The number of silicon atoms per m3 is 5 × 1028. This is doped simultaneously with 5 × 1022 atoms per m3 of Arsenic and 5 × 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that nI = 1.5 × 1016m–3. Is the material n-type or p-type?
Number of silicon atoms, N=5×1028 atom/m3 Number of arsenic atoms, nAS=5×1022 atom/m3 Number of indium atoms, nIN=5×1022 atom/m3 ni=1.5×1016 electron/m3 ne=5×1022−1.5×106=4.99×1022 Let number of holes be nh In thermal equilibrium, nenh=ni2 so, nh=4.51×109 ne>nH, material is an n-type semiconductor.
