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March 30, 2017

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Determine the amount (in grams) of boron that when substitutionally incorporated into 1 kg of silicon will establish a charge carrier density of 3.091×1017 carriers/cm3.

  • Chemistry - ,

    Answer : 2.4227*10^-3
    i.e. 0.002423

  • Chemistry - ,

    thanks

  • Chemistry - ,

    Information
    density Si=2.33 g/cc
    Mw(P)=10.81 g/mole
    NA=6.022*10^23 at/mole


    V (Si)=1 Kg *1000 g/Kg /(2.33 g/cc = 4.29*10^2 cc

    moles B/cc = 3.091*10^17 carriers/cc /6.022*10^23 =5.133*10^-7 moles B/cc

    moles B= 5.133*10^-7 moles/cc *4.29*10^2 cc= 2.203*10^-4 moles B

    g B= 2.203*10^-4 moles * 10.81 g/mole = 2.4227*10^-3 g

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