Introduction of diode, working of diode, operation of diode, explanation of p-n junction diode

Class planning

Introduction:
The materials such as copper, aluminium etc. are good conductors of electricity. While the materials such as wood, glass, mica etc. are very bad conductors of electricity and are called insulators. Germanium(Ge) and Silicon (Si) are two well-known semiconductor materials.
Along with these two basic semiconductor materials some impurities are used to obtain extrinsic semiconductor materials called n-type and p-type. These two materials are then chemically combined to obtain p-n junction. Such a semiconductor p-n junction forms a popular electronic device called diode.
The p-n junction diode:
The p-n junction forms a popular semiconductor device called p-n junction diode. The p-n junction has two terminals called electrodes, one each from p-region and n-region. Due to the electrodes it is called diode.
Forward biasing of p-n junction diode:
If an external d.c voltage is connected in such a way that the p-region terminal is connected to the positive of the d.c voltage and the n-region is connected to the negative of the d.c voltage the basing condition is called forward biasing. The p-n junction is said to be forward biased.
Key point: forward biasing means connecting p-region to positive and n-region to negative of the battery.
Reverse biasing of p-n junction diode:
If an external d.c voltage is connected in such a way that the p-region terminal of a p-n junction is connected to the negative of the battery and the n-region terminal of a p-n junction is connected to the positive terminal of the battery, the biasing condition is called reverse biasing of a p-n junction.
Key point: Reverse biasing means connecting p-region to negative and n-region to positive of the battery.