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What are donor impurity atoms and accept...

What are donor impurity atoms and acceptor impurity atoms?

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The donor impurity atoms are of valeance five like As, P and Sb.
The acceptor impurity atoms are of valence three like B, Al, Ga and In.
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(a) Find the conductivity of intrinsic silon at 300K . It is given that n_(i) at 300K in silicon is 1.5x10^(10)//cm ^(3) and the mobilities of electrons and holes in silicion are 1300cm^(2)//V-sec and 500 cm^(2)//V-sec respectively. (b) if donor type impurity is added to the extent of 1 impurity atom in 10^(8) sillicon atoms, find the conductivity. (c ) if acceptor inpurity is added to the extent of 1 impurity atom in 10^(8) silicon atoms,find the conductivuity. Given: number of atoms//m^(3) for Si=5xx10^(28)

Knowledge Check

  • Donor type impurity is found in

    A
    Trivalent elements
    B
    Pentavelent elements
    C
    In both the above
    D
    None of these

  • The removal of impurities from an ore

    A
    Calcination
    B
    Levigation
    C
    Slagging
    D
    Refining

  • The element that can be used as acceptor impurity to dope silicon is

    A
    Antimony
    B
    Arsenic
    C
    Boron
    D
    phosphorous

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