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A semiconductor crystal has equal elect...

A semiconductor crystal has equal electron and hole concentration of `9xx10^(8) m^(-3)` it is doped by indium so that the hole concentration increases to `4.5 xx10^(12) m^(-3)` calculate the new concentration of free electrons in the doped crystal nad also mention its type

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Given `n_(1) = 9 xx 10^(8) m^(-3)`
`n_(6) n_(h) n_(1)^(2)`
`n_(e) = (n_(1)^(2))/( n_(h)) = ((9xx 10^(8))^(2))/( 4.5 xx 10^(12)) = 1.8 xx 10^(5) m^(-3)`
As the hole concentration increases after doping the new semiconductor obtained is p - type
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