Basic Electrical and Electronics Engineering: Unit III: Analog Electronics
Reverse Biased PN Junction
We connect the voltage source to a PN junction, such that positive terminal of the voltage source is connected to the N-region and negative to the P-region, the PN junction is said to be reverse biased.
REVERSE
BIASED PN JUNCTION
We
connect the voltage source to a PN junction, such that positive terminal of the
voltage source is connected to the N-region and negative to the P-region, the
PN junction is said to be reverse biased. Figure 3.25 shows a reverse biased PN
junction.
When
a PN junction is reverse biased, as shown in Figure 3.25(a) the holes in the
P-region are attracted towards the negative terminal of the voltage source. And
the electrons in the N-region are attracted to the positive terminal of the
voltage source. Thus the majority carriers are drawn away from the junction.
This widens the depletion layer and increases the barrier potential as shown in
Figure 3.25 (b).
The
increased barrier potential makes it very difficult for the majority carriers
to diffuse across the junction. Thus there is no current due to majority
carriers in a reverse biased PN junction. In other words, the junction offers
very high resistance under reverse biased condition. However, the barrier
potential helps the minority carriers in crossing the junction. Hence a small
amount of current does flow through the reverse biased PN junction.
The
amount of this current depends upon the number of minority carriers diffusing
across the junction. The current is known as reverse saturation current,
Basic Electrical and Electronics Engineering: Unit III: Analog Electronics : Tag: : - Reverse Biased PN Junction
Basic Electrical and Electronics Engineering: Unit III: Analog Electronics
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