Diode
- Friday, March 27, 2009, 3:56
- Electronics
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DIODE
When p-type material and n-type material join together it makes a diode.
TYPES OF DIODE
There are three main types of diode
- Silicon Diode
- Light emitting diode (LED)
- Photo diode
SILICON DIODE
Silicon diode is a common type of diode which is made up of silicon and it is basically used to design circuit.
It produce energy when battery connects to it, it produce energy in form of heat.
PHOTO DIODE
Light emitting diode is another type of diode which is made up of Gallium Arsenide.It emits light when forward biased, free electrons in N material cross PN junction and it enters into P material, when electrons combine with a hole they loose energy in form of light. It is commonly used in infrared light, seven segment display, indicators and optical communication.
PHOTO DIODE
It operates when reverse biased, it has a small transparent window which allow light to enter and strike the PN junction, it is made up of light sensitive material. When light falls on PN junction electron hole pair are generated and thus reverse current increases, more light more current, it is used in optical communication.
Written by - Zamarak Khan Kasi
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