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Q. Suppose a pure Si crystal has 5 × 1028 atoms m–3. It is doped by 1 ppm concentration of pentavalent As. Calculate the number of electrons and hole. (Given that ni = 1.5 × 1016 m–3.)

Dear student,
Here numbers of electron( n e) =5×1028106=5×1022   m -3
We know
ni2 =nh×nenh=ni2ne=1.5×1.5×10325×1022=4.5×109m-3

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