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What change in the energy band gap of a ...

What change in the energy band gap of a semiconductor occurs due to increase of doping ?

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decrease
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A semiconductor har equaI eIectron and hoIe concentrations of 6 xx 10^(8)"m"^(-3) . On doping with a certain impurity,the eIectron concentration of the semiconductor increases to 8 xx 10^(12)"m"^(-3) . (i) What type of semiconductor is obtained on doping? (ii) CaIcuIate the new hoIe concentration of the semiconductor.