Explain term depletion layer across a p-n junction, Chemistry

Assignment Help:

Explain term 'depletion layer' across a p-n junction

Rectifying action of p-n diode can be explained on the foundation of electronic structure of the semiconductor. When a pure semiconductor is doped to become n-type, Fermi level shifts up from the middle of the energy gap towards donor level. This is so because position corresponding to 505 probability of occupation moves up because of the relatively high concentration of donor electrons in conduction band. If crystal is p-type, Fermi level shifts down towards the acceptor level. When same crystal is doped to become ntype on one side and p-type on the other side, Fermi level has to be constant throughout the crystal in thermal equilibrium. This results in electron energy levels at the bottom of the conduction band in n-part to be lower than those in the p-part, by an amount equal to contact potential eVo as demonstrated in Fig a. Contact potential at the junction gives rise to energy barrier or depletion layer.

 

1733_deplition layer.png


Related Discussions:- Explain term depletion layer across a p-n junction

Drugs or medicines from plants, Drugs or Medicines from plants 1. Bark ...

Drugs or Medicines from plants 1. Bark of willow tree that consists of salicylic acid. It is employed to take relief from fever and pain. 2. Alkaloid Reserpine that is taken

Show the colour of actinides and lanthanides ions, Q. Show the Colour of ac...

Q. Show the Colour of actinides and lanthanides Ions? Ions of actinides and lanthanides are coloured in the solid state as well as in aqueous solution, as is the case with the

Qualitative Analysis of Cations, We are asked to design a qualitative analy...

We are asked to design a qualitative analysis scheme that can be used to determine which cations are present in a solution containing only four of the following cations: Pb2+, Ag+,

How to find equivalents, I put an unknown solid acid into a base solution. ...

I put an unknown solid acid into a base solution. How do I find the equivalents of base consumed?

Calculate the difference between the fugacity, Calculate the difference bet...

Calculate the difference between the fugacity? The pressure in a liquid droplet of radius r is greater than the pressure of the surrounding equilibrated gas phase by a quantity

Finding volume with molarity, If you have 250 mL of 2 M sodium sulfate dilu...

If you have 250 mL of 2 M sodium sulfate diluted to make 0.500 M of sodium sulfate, how would you figure out the volume?

Reference solution, Reference solution:   A proper reference soluti...

Reference solution:   A proper reference solution contains color reagent plus sample buffer. The difference between the reference and a sample is that the concentration of

#physical chemistry, Limitations of second law of thermodynamics

Limitations of second law of thermodynamics

Organics, what are the different methods for purifying the organic compound...

what are the different methods for purifying the organic compounds with examples and applications on these methods in our daily lives or in industry?

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