The device holds the property of current controllability. As it has the ability to transfer the resistance of a device.Ī transistor is categorized as either Bipolar Junction Transistor i.e., BJT or Field Effect Transistor i.e., FET. It is a merger of two words transfer and re sistor. It is a device that possesses the ability to allow the flow of current from a region of having high resistance to that of the low resistance. However, if the reverse applied voltage is increased continuously then it can cause damage to the device. Therefore, the current through the device will not show a major increase in it. Thereby gaining sufficient energy to surpass the barrier potential of the depletion region.īut in the case of reverse biased condition, the depletion width increases with the increase in applied reverse voltage. This is so because majority carriers experience repulsion from the battery terminal. When a forward voltage is provided then current through the device increases. It is noteworthy here that in both forward and reverse applied voltage, the device operates in a different manner. That blocks any further flow of carriers across the junction. This depletion region contains neutral atoms. But after a certain point of time, a depletion region is created at the junction because of the recombination of holes and electrons. At the unbiased state flow of carriers take place due to temperature variation. When no any potential is applied across its terminals then it is said to be the unbiased state. And at the time of providing biasing it can be either forward biased or reverse biased.

However, its operation is different in an unbiased and biased state. The junction of the two materials forms depletion region that contains neutral atoms.

Here, a p-type semiconductor material having majority carrier holes is fused with an n-type semiconductor material having majority carrier electrons. The figure shown below will help you to understand the structure of the diode more easily: However, there exist several types of diodes such as zener diode, tunnel diode, a PIN diode, LED etc. The basic form of the diode is a PN junction diode. The diode permits current to flow in only single direction. In rectifier circuits, detector circuits, clippers and clampers circuits.Ī diode is a semiconductor device that is formed by the combination of p and n-type semiconductor material. Only 1 depletion region is present due to single junction.Ģ depletion region are present due to 2 junctions.Īs load current is controlled by applied potential at the base. A semiconductor device that has the ability to allow current flow unidirectionally.Ī semiconductor device that has the ability to allow current flow from a region of high resistance to low resistance.

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