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

Equivalent weight, how do you calculate equivalent weight of salts

how do you calculate equivalent weight of salts

Baseline noise HPLC, your HPLC system has efficiency 1500 theor. Plates, bu...

your HPLC system has efficiency 1500 theor. Plates, but baseline is very noisy. You have a choice either increase response time or decrease attenuation. what will you choose and wh

Application of Electrogravimetry, How to determine the mass of substance el...

How to determine the mass of substance electrogravimetricaly?

Negative deviation or positive deviation, Refer to diagram A, which describ...

Refer to diagram A, which describes the system formed by water-ethanol mixtures at 1 atm pressure, but is not drawn to scale.  Industrial ethanol production results in the lowest-b

s block elements, properties of s block elements (point wise

properties of s block elements (point wise)

S block, Uses of plaster of paris

Uses of plaster of paris

Disaccharides - biomolecules, Disaccharides - Biomolecules The disacch...

Disaccharides - Biomolecules The disaccharides give in on hydrolysis two monosaccharides. Those disaccharides that generates two hexoses on hydrolysis contain a general formul

Which electronic configuration is not observing the ( n+ 1), Which electron...

Which electronic configuration is not observing the ( n+ 1) rule: (1) 1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 3d 1 , 4s 2                (2) 1s 2, sp 2 , sp 6 , 3s 2 , 3p 6 , 3

Attacking reagents - organic chemistry, Attacking Reagents - Organic chemis...

Attacking Reagents - Organic chemistry The fission of the substrate molecule to make centres of high or low electron density is affected by attacking reagents. Most of the atta

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