What is depletion layer in transistor?

In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating region within a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away by an …

How many depletion regions does a transistor have?

two depletion regions
BJT Junctions The device in Figure below (a) has a pair of junctions, emitter to base and base to collector, and two depletion regions. (a) NPN junction bipolar transistor.

How many layers are there in a transistor?

three layers
A transistor has three layers of semiconductors – an emitter, a collector and a base, and it controls the electric conductivity across it to perform a desired task (Ch.

How many depletion layer is formed in NPN transistor?

The npn transistor is made up of three semiconductor layers: one p-type semiconductor layer and two n-type semiconductor layers.

What is the cause of depletion layer?

The depletion region is caused by the diffusion of charges. The region containing the dipoles and completely depleted of mobile charge carriers is called the depletion region.

How many depletion layers are there?

Originally Answered: What is the number of depletion layers in a transistor? For a BJT there is one for each pn-junction. Therefore, there are two depletion regions. The thickness of the depletion layer will depend on the biasing condition applied to the junction.

What causes the depletion region?

The depletion region is caused by the diffusion of charges. Because of the concentration gradient holes diffuse from p-side to the n-side across the junction while electrons diffuse from the n-side to the p-side. The holes and the electrons diffusing towards each other combine near the junction.

Which element is used for making a transistor?

The two elements that are frequently used for making transistors are Silicon and Germanium.

What are the two types of transistor?

Transistors typically fall into two main types depending on their construction. These two types are bipolar junction transistors (BJT) and Field Effect Transistors (FET).

How depletion layer is formed?

The depletion region is caused by the diffusion of charges. The holes and the electrons diffusing towards each other combine near the junction. In doing so positive and negative ions are formed. The pair of positive and negative ions at the junction forms the dipole.

What is the depletion layer in a bipolar junction transistor?

A bipolar junction transistor, shortly termed as BJT is a current controlled device that consists of two PN junction for its function. and there are two areas of depletion. The depletion layer’s thickness will depend on the biassing condition applied to the junction.

Where are the depletion layers in a semiconductor?

In an insulating region or depletion layer within a conductive, doped semiconductor material where the mobile charge carriers have been carried away, or have been forced away by an electric field. The only elements left in the depletion region or layer are ionized donor or acceptor impurities.

How is the thickness of the depletion layer determined?

The thickness of the depletion layer will depend on the biasing condition applied to the junction. There is only one in a P — N junction transistor. In an insulating region or depletion layer within a conductive, doped semiconductor material where the mobile charge carriers have been carried away, or have been forced away by an electric field.

How many depletion layers are in a BJT?

Answer Wiki. For a BJT there is one for each pn-junction. Therefore, there are two depletion regions. The thickness of the depletion layer will depend on the biasing condition applied to the junction.