Bias on the PN junction and current understanding of the size of - freshair

 PN junction dynamic equilibrium, in the space charge region has a built-in electric field, the direction from N to point P. When is partial, P extremely high voltage, N pole plus low-voltage electric field direction and the electric field in the opposite direction, the electric field weakened, free child easy flow of current; when the reverse bias, P plus a very low voltage, N very high voltage, electric field and the electric field in the same direction, the electric field has been strengthened, the free flow of more difficult child, the current small. < br> a fun memory as follows:
PN junction at right: (P) n)
two vertical bars that space charge region boundary.
PN junction is biased, the equivalent of:
( P) N),
are positive and negative negative superposition, the effect is:
(P) N), the space charge region becomes smaller.
PN junction reverse bias, the equivalent of:
(p ) N),
offset the positive and negative, this effect is:
(P) N), the space charge region to expand.
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