2. The electron concentration 2 points
in a sample of uniformly
doped n - type silicon at 300
OK varies linearly from 10171
cm3 at r=0 to 6x1016/cm3 at
x=2um. Assume a situation
that electrons are supplied to
keep this concentration
gradient constant with time. If
electronic charge is 1.6x1019
coulomb and the diffusion
constant Dn=35 cm2/S, the
current density in the silicon, if
no electric field is present is
С C
(a) Zero
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The electron concentration in a sample of uniformly doped N type silicon at 300oK varies linearly from 1017 cm-3 at x = 0 µm to 6 x 1016 cm-3 at x = 2 µm. Assume a situation that electrons are supplied to keep this concentration gradient constant with time. If electronic charge is 1.6 x 10-19 coulomb and the diffusion constant Dn = 35 cm2/sec, the current density in the silicon, if no electric field is present is
a. Zero
b. -112 A/cm2
c. +1120 A/cm2
d. -1120 A/cm2
if this is the question the answer is
d. -1120 A/cm2
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