ACTIVITY 1
Go through the following explanation on how a pn junction is formed and answer the questions in the Evaluation section.
Junction diodes
Junction refers the region where the two types of semi-conductors meet. The junctions are made by combining an n-type and p-type semi-conductor. The n-region is the cathode and the p-region is the anode.
Forward bias of a p-n junction
It occurs when the p-type block is connected to the positive terminal and the n-type block is connected to the negative terminal of a battery. The depletion layer of the junction reduces to be very thin to allow the flow of electric current.
Reverse bias of a p-n junction
The negative terminal of the battery is connected to the p-type region while the n-type isconnected to positive terminal.
The depletion layer widens and resists the flow of electrons to minimal or zero (no current flowing through) when the electric field increases beyond critical point the diode junction eventually breaks down and at this voltage it is referred to as the breakdown voltage. Diodes are intended to operate below the breakdown voltage.
ACTIVITY 2
Watch the video clip below and answer the questions that follow at the Evaluation section.