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What is the concentration of electrons in the sample holes

A sample of Ge is doped with acceptors to a level N_a = 4 x 10^14 cm^-3 and donors to a level N_d = 1.6 x 10^14 cm^-3. Assume that the impurities are fully ionized at room temperature.

a) Is the sample n-type or p-type? why?

b) What is the concentration of electrons in the sample? holes?

c) What is the position of the Fermi energy?

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