Consider a p-type semiconductor at 300 k with band gap of

Question

Consider a p-type semiconductor at 300 K with band gap of 0.8 eV, acceptor levels lying 0.04 eV above the valence band, and Na = 2.51 × 10²¹/m³.

(a) How far above the valence band is the Fermi level?

(b) Roughly what is the density of valence holes?

(c) Roughly what is the density of electrons in the conduction band?

(d) Repeat parts (a), (b), and (c) for a temperature of 500 K.

(e) Roughly what is the temperature above which it becomes intrinsic?