1. When the positive terminal of the battery is connected to
the P-type semiconductor and the negative terminal of the
battery is connected to the N-Type semiconductor, then it is
called Forward Bias or Forward Biasing.
2. We know that the same polarity always repels to each
other and opposite polarity always attracts each other
3.
So that the device allows the flow of larger current in one direction called forward
biasing.
Reverse bias: when the p-side of the diode is connected to the negative voltage of the
battery and the n-side is connected to the positive voltage of the battery. This causes an
increase in the thickness of the depletion layer. This allows very less current to flow through the
PN junction.
Three modes: Forward blocking mode, Reverse Blocking mode and forward conduction mode
Applications: Used in A.C. & D.C. Converters, Used in Invertors, High Power Switches