What is electron diffusion?

The process by which, charge carriers (electrons or holes) in a semiconductor moves from a region of higher concentration to a region of lower concentration is called diffusion. The electrons present at left side of the semiconductor material will moves to right side, to reach the uniform concentration of electrons.

What is the main cause of electron diffusion?

Diffusion current Density is a current in a semiconductor caused by the diffusion of charge carriers (holes and/or electrons). This is the current which is due to the transport of charges occurring because of non-uniform concentration of charged particles in a semiconductor.

What is the SI unit of electron diffusion constant?

m2/s
What is the SI unit of electron diffusion constant? =m2/s.

What is meant by diffusion of charge carriers?

The movement of charge carriers caused only by a charge carrier concentration gradient. NOTE In the case of transfer across a p‑n junction, the amount of transfer depends on the internal electric field resulting from the built-in electric field and applied bias.

What is the direction of the electron diffusion current?

Quite simply, the current moves in the same direction as the movement of holes and opposite to that of electrons. The diffusion current is proportional to the concentration gradient or how nonuniformly the carriers were initially distributed.

What is the direction of diffusion current?

In junction diode, the direction of diffusing current is from P-region to N-region.

How is diffusion measured?

A rate is a quantity expressed per unit of time. For example, the speed you travel in your automobile is a rate, e.g., 80 miles/hour. So, diffusion rate is expressed as the amount of salt moved per time, e.g., 0.1 moles/sec.

What is hole and electron in PN diode?

The open circles on the left side of the junction above represent “holes” or deficiencies of electrons in the lattice which can act like positive charge carriers. The solid circles on the right of the junction represent the available electrons from the n-type dopant.

What is diffusion process?

diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration. A familiar example is the perfume of a flower that quickly permeates the still air of a room.