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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=1.5×1016 /m3. Is the material n-type or p-type?

Solution
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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=5×10221.5×106=4.99×1022
Let number of holes be nh
In thermal equilibrium, nenh=n2i
so, nh=4.51×109
ne>nH, material is an n-type semiconductor.

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