Diffusion current, Electrical Engineering

Diffusion Current :

The carrier currents are also due to concentration gradients in the doped material which lead to diffusion of carriers from high concentration region to low concentration region. A concentration gradient exists if either the number of holes or electrons is greater in one region as compared to the rest of the region. When a concentration gradient of carriers exists in a material, the charge carriers tend to move from the region of high concentration to the region of lower concentration. The process is called the diffusion and the current due to this process is called the diffusion current. Let us assume that at reference plane x, the density of holes is p per m3. Let the carriers have a mean free path of Ax and mean free time of at between collisions.

Total Current in a semiconductor

It is possible that a potential gradient and a concentration gradient may exist within semiconductor. In such a case, the total current is the sum of drift current due to potential gradient and the diffusion current due to charge carrier concentration gradient.

Posted Date: 2/8/2013 2:47:35 AM | Location : United States

Related Discussions:- Diffusion current, Assignment Help, Ask Question on Diffusion current, Get Answer, Expert's Help, Diffusion current Discussions

Write discussion on Diffusion current
Your posts are moderated
Related Questions
What is synchronous data transfer? It is a data method which is used when the I/O device and the microprocessor match in speed. To transfer a data to or from the device, the us

Latch A 8 bit  latch comprises of transparent latch D flip  flop. It is commonly  used  to interface output  device with  microprocessor. A typical example of such 8 bit  latc

how double diffraction occur at the surface

Fermi Dirac level: Sol. The Fermi level is simply a reference energy level. It is the energy level at which the probability of finding an electron n energy unit above it in

Q. Working of self - excited generators? For self-excited generators, residual magnetism must be present in the ferromagnetic circuit of the machine in order to start the self-

What is meant by doping? Doping: Semiconductors in its extremely pure form are termed as intrinsic semiconductor such intrinsic semiconductor to which several suitable impur

can you please briefly explain about significance of the word direction in vectors with some valid points

Q. Basic working of optical coupler? The optical coupler is suitable for frequencies in the low megahertz range. The photodiode type shown above can handle only small currents;

Definition of  Magnetism Magnetism is explained as the force produced by charge particles (electrons) of magnet. A magnet is a material that obtained a magnetic field.

Explain a couple