Diffusion current, Electrical Engineering

Assignment Help:

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.


Related Discussions:- Diffusion current

Squeeze castings, Squeeze Castings: Squeeze casting, also known as ...

Squeeze Castings: Squeeze casting, also known as liquid metal forging, is a combination of casting and forging process . The molten metal is poured into the bottom half

Integrated circuit with resistive feedback, principle of resistive feedback...

principle of resistive feedback circuit change when the square wave and triangular pulse frequencies, the amplitude of the triangle wave

Combinational logic circuit , Design a combinational logic circuit to conve...

Design a combinational logic circuit to convert XS3BCD code in to the  standard 8421 BCD code.

Neutral line in transformer, thus secondary winding of transformer consists...

thus secondary winding of transformer consists of neutral line or not?

Dielectric heating - stepper motor , Dielectric Heating Dielectric  l...

Dielectric Heating Dielectric  losses  occur in  insulating materials. These are same  as hysteresis losses  in magnetic materials. When  an alternating  electric  field  is a

Robotic, Ask questCompute the mean and variance of a four-level image with ...

Ask questCompute the mean and variance of a four-level image with histogram p(z\ ) = 0.1, p{zi) = 0.4, ?(1?) =0.3, p{za) = 0.2. Assume that z\ = 0, zi = 1, z$ = 2, and ? — ?. i

Construction features of electron gun, Compare the application of CO 2 and...

Compare the application of CO 2 and Nd :YAG Laser for cutting operation. Define with a neat and clean diagram the construction features of ‘electron gun' used for preparing an

Microprocessor, Memory map of tpa in a personal computer and explain such o...

Memory map of tpa in a personal computer and explain such of the areas in brief

Buck converter - power supplies , Buck Converter In buck  converters th...

Buck Converter In buck  converters the output  voltage is  always  less than the  input  voltage. The basic  circuit  of buck converter is shown  in figure. The operation of th

Gis database, GIS database:  In a nutshell, we could say that the GIS ...

GIS database:  In a nutshell, we could say that the GIS technology integrates general database operations (data query and statistical analysis), along with the unique a

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd