This document discusses the basics of a PN junction diode. It explains that a PN junction diode consists of a positive P-type region and negative N-type region fused together. It describes forward bias as applying voltage such that the positive terminal is connected to the P-side and negative to the N-side, causing current to flow. Reverse bias is applying the opposite voltage configuration, widening the depletion region and preventing current from flowing. The document provides an overview of PN junction diode characteristics and biasing methods.

1. Prof.Prasant Tiwari
P-N JUNCTION DIODE
Basic Electrical & Electronics
Engineering

2. PN JUNCTION DIODE
 In this video, we learn about PN junction diode
characteristics in detail.
 How to bias a PN junction (Forward & Reverse bias
methods), behavior of PN junction during forward &
reverse bias.
The basic difference between a forward bias and
reverse bias is in the direction of applying external
voltage.
The direction of external voltage applied in reverse
bias is opposite to that of external voltage applied in
forward bias.

3. PN JUNCTION DIODE
 A diode is a semiconductor device with two, positive charged and
negative charged regions fused together with a junction in between, and is
called a P-N junction diode.
 When a p type material suitably joined n type material, a P-N junction
formed.

4. FORWARD BIAS OF PN JUNCTION
 When positive terminal of battery connected to the p-side (Anode terminal)
of pn junction diode and negative terminal of battery is connected to the n-
side(cathode) of the pn junction diode such biasing is called forward
biasing
 which has the effect of forward biasing PN
junction diodes depletion layer width start
decreasing.
 After potential 0.3 V for germanium and
0.7 V for silicon depletion layer vanish and
diode starts conducting in forward bias
region.

5. REVERSE BIAS OF PN JUNCTION
 When negative terminal of battery connected to the p-side (Anode terminal) of pn
junction diode and positive terminal of battery is connected to the n-side(cathode)
of the pn junction diode such biasing is called reverse biasing
 Depletion layer width start increasing.
 Current stops flowing during reverse bias
condition.

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