Chemistry

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(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.

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

  • Chemistry -

    a) 6.22*10^18

    No idea for b) any thoughts or how to for b)?

  • Chemistry -

    b please...

  • Chemistry -

    b) 10^7 / lamda*(wavelength in nm)

  • Chemistry -

    something wrong i cant got it

  • Chemistry -

    rufus, please what is answer

  • Chemistry -

    1.09E13

  • Chemistry -

    WRONG

  • Chemistry -

    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

  • Chemistry -

    thanks

  • Chemistry -

    Thank you for the explanation.

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