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Evaluating conductivity of doped semionductors

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A piece of Si is doped with Phosphorus to 1x1018 [1/cm3] Please calculate:

(a) the electron concentration?
(b) the hole concentration?
(c) he conductivity of this piece of Si
(d) Assume the thickness of the Si is 0.5µm, what is the Sheet Resistance
(e) If the thickness of the Si is still 0:5µm, R1 with 1µm wide and 4µm long,
R2 with 2µm wide and 12µm long, What is R1/R2 ?

At temperature = 300K.

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The solution evaluates conductivity of doped semionductors.

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