Homework Help: Chemistry

Posted by Ankur on Saturday, January 12, 2013 at 10:22am.

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.

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

Chemistry - Ling, Saturday, January 12, 2013 at 5:05pm
a) 6.22*10^18

b)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

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