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A doped semiconductor has impurity levels 30 meV below the conduction band. (a) Is the material n-type or p-type ? (b) In a thermal

A doped semiconductor has impurity levels 30 meV below the conduction band. (a) Is the material n-type or p-type ? (b) In a thermal collision, an amount kT of energy is given to the extra electron loosely bound to the impurity ion and this electron is just able to jump into the conduction band. Calculate the temperature T.

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