(a) Silicon (50 g) has been doped with 27 mg of antimony (Sb). Determine the concentration of free charge carriers (carriers/cm3) at room temperature in this material.

Question

(b) Calculate the absorption edge of this material. Express your answer as a wavenumber in units of inverse meters.

Answer 1

For a) 6.22*10^18

Answer 2

Any ideas for b)

Answer 3

I'll be appreciate if you tell me about b

Answer 4

9.1E21

Answer 5

NOT RIGHT

Answer 6

wavenumber= Eg / hc

Eg(Silicon band energy)= 1.11 eV (to joules)
h=6.6*10^-34
c=3*10^8

wavenumber= Eg*1.6*10^-19 / hc = 896969.69

Answer 7

Thank you for the explanation.