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Homework on SHR recombination



Jan 1, 1970
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.