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Homework on SHR recombination

Discussion in 'Electronic Basics' started by PZ, Feb 1, 2006.

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  1. PZ

    PZ Guest

    Here is my homework which I don't understand. Any comments on the
    problem or how to solve it is good, thanks.


    Light is incident on a silicon bar doped with 1016cm-3 donors, creating
    1021 cm-3s-1 electrons hole pairs uniformly throughout the sample.
    There are 1015 cm-3 bulk recombination centers at Ei with electron and
    hole capture cross sections of 10-14cm2.

    a) Calculate the steady-state hole and electron concentrations with the
    light turned on.

    b) At time t=0 the light is turned off. Calculate the time response of
    the total hole density and find the lifetime. The thermal velocity is
    107cm s-1 and there is no current following.
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