A `Ge` specimen is dopped with `Al`. The concentration of acceptor ato – InterviewSolution

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1.	A `Ge` specimen is dopped with `Al`. The concentration of acceptor atoms is `~10^(21) at oms//m^(3)`. Given that the intrinsic concentration of electron hole pairs is `~10^(19)//m^(3)`, the concentration of electron in the speciman isA. ` 10^(17)//m^(3)`B. `10^(15)//m^(3)`C. `10^(4)//m^(3)`D. `10^(2)//m^(3)`
Answer» Correct Answer - A Here `n_(i)=10^(19)m^(3), n_(h)=10^(21) "atoms"//m^(3)` The intrinsic concentration of electron-hole pair is given by `n_(i)^(2)=n_(e)n_(h)` `:. n_(e)=n_(i)^(2)/n_(h)=((10^(19))^(2))/10^(21)=10^(38)/10^(21)=10^(17)//m^(3)`

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