p-n , , p-n l 0. l 0 = l p + l n, l p l n p-n , p n .
, p-n l n l p n p . .
, φ = W/q.
p-n .
n p , . n p
φ 0 = φEp φEn
p-n .
:
φEp φEn , nn pn = ni2, :
, p-n , .. . :
, , 0,35 0,4, 0,65 0,7.
p-n :
dE/dx = Q(x)/εε 0, ε , ε 0 .
, ,
Qp(x) = -qN; -l p ≤ x ≤0, p Q(x) = +qN; 0 ≤ x ≤ l n, n .
, :
x E = 0.
E p(0) E n(0), :
l p / l n = N / N .
, ,
. .
E(x) = -dφ(x)/dx, p n .
Q(x), E(x) φ(x) .
φn(0) φp(0) ,
φ 0 = φEp φEn :
ln = l p , ln < l p ln > l p .
N = N, .
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, , , , p-n , p-n . p-n - . .
p-n ,
, p-n , .