p
∂t
c) Assuming that x is measured from the depletion region edge at x = 0 show that
∆pn(x) = Aex/L +Be−x/L +C
is a solution for ∆pn(x) on the n-type side of the junction (to do this just substitute this
solution in and show it works).
1
EE4161
Homework Assignment Due Feb 1
Calculate the minority carrier diffusion current at x = 0 by computing J =−qD d∆p(x)
D pdx
at x = 0.
f) From the last result determine the constants for the diode current to be in the form:
jD=Jo(evD/VT −1)−JL
(note that the current density J=I/A and that Jo is JS in Mertens)
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