Boron atoms are added to a Si film resulting in an impurity density of 4 × 10^16 cm^–3. (a) What is the conductivity type (N-type or P-type) of this film? (b) What are the equilibrium electron and hole densities at 300 K and 600 K? (c) Why does the mobile carrier concentration increase at high temperatures? (d) Where is the Fermi level located if T = 600 K?

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Boron atoms are added to a Si film resulting in an impurity density of 4 × 10^16 cm^–3.
(a) What is the conductivity type (N-type or P-type) of this film?
(b) What are the equilibrium electron and hole densities at 300 K and 600 K?
(c) Why does the mobile carrier concentration increase at high temperatures?
(d) Where is the Fermi level located if T = 600 K?
 
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