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In a semiconductor, the number density o...

In a semiconductor, the number density of intrinsic charge carriers at `27^@C` is `1.5 xx 10^(16) // m^3`. If the semiconductor is doped with impurity atom, the hole density increase to `4.5 xx 10^(22)//m^3`. The electron density in the doped semiconductor is `"_______" xx 10^(9)//m^3`.

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The correct Answer is:
5
For a doped semi-conductor in thermal equilibrium `n_en_h=n_i^2`
`implies n_e=n_i^2/n_h=((1.5xx10^16)^2)/(4.5 xx10^(22))=5xx10^9 m^(-3)`
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