Electronic Devices Lecture-21: Problems on Fermi level Concept

[@UnacademyFlux]

@vinu shri see ni = pi, so we can use anyone

[@mayanksingh-hj7rb]

sir i have a doubt regarding...at time 21:22 you said that its a p type semiconductor, then why are we not using the formula for the p-type i.e. -- Ei-Ef=kT ln(p/ni). sir please correct me

[@bubunmazumder]

I know where's your problem,see if you apply "that formula" which you want to use then also you would have the same ans just by reversing its sign...try it

[@Shudhdesivibes]

All your lectures are well explained and covering all the concepts helpful for making base of subject. Thnx u sir

[@سعيدحميد-ذ3ذ]

estimate the resistivity of a silicon sample doped with phosphorus to a concentration of 10^15 cm^-3 and boron to concentration of 10^17 cm^-3 the electron mobility and hole mobility are 700 cm^2/VS and 300 cm^2/Vs respectively

[@kiruthikaanbazhagan5004]

sir in question 4 at 18:05 why we won't compare with the intrinsic si and p-type si?

[@harshitagupta8411]

Sir at 3:05 when we are provided with the acceptor ion concentration then why are we not calculating for the net Nd by subtracting Na

[@UnacademyFlux]

Harshita Gupta not required it is approximately equal to Nd

[@harshitagupta8411]

Thanku sir for your video lectures they are helping me a lot during revision n d concepts are solid by through your explanations

[@shivanandkambale608]

In single video ,u explained many concepts.thank u so much

[@vasamsetti1801]

Sir I have a doubt, in the last problem why we should not calculate for n = ni2 / p for conc. of donors added for p-type ?

[@gauthambalu2071]

Yes bro I'm also having the same doubt

[@kamaleshwaran9330]

Sir you have CBSE 12th physics lectures??

[@berkayonayl2136]

How can you find ni at 4.11 ?

[@sajalgoyal2316]

URGENT : when will you upload the remaining videos of ELECTRONIC DEVICES(which include PN junction and more) ??

[@iamisro6636]

who will consider the acceptor concent? As they too arent in negligible amount so due to appriciable amount of acceptor atoms , fermi level will move away of CB or a bit more towarda centre of forbidden gap ? I dont think its the right answer . Please correct me . Answer will be .04 eV lesser .

[@UnacademyFlux]

can you tell at what time i need to look into

[@anupagrawal6856]

sir in the first question, why didn't we consider Na and found Nd=Nd-Na. In that way the answer is 0.420ev while your answer is 0.424ev. Is this much difference allowed?

[@tbnelly5764]

It's concentration not densities ig

[@gnanaprakash2436]

sir,i am following your lectures deeply thankful for all your efforts.

[@viratramnayak7052]

Sir this is enough for gate

[@charleskafuluma1985]

Thanks so much for this lecture

[@pellurusaikrishna8454]

Sir when u gonna explain A TO D CONVERTERS?

[@tarun_kothuri]

A clear and perfect explanation! Watching after 4 years

[@athiraps3390]

Sir please upload engg mathematics luctures

[@Satishkumar-rh2ir]

Sir sol. Of ln(Nc/Nd ) /ln(Nc/4Nd)

[@omdarshanpaul517]

Sir please give next lecturs.....

[@ramanjaneyulujagannadh2668]

Sir my goal is IES . But I don't know the way of study for IES . would you please help me sir

[@UnacademyFlux]

ramanjaneyulu jagannadh for IES you should know how to solve descriptive questions and general knowledge.. preparation should be like a gate..but you should learn more subjects in IES exam

[@Jacksparrow-ti1oq]

sir please upload the next lecture

[@mdkalimullah4207]

Sir complete the edc remaining part it is urgent

[@physicswithrajamubasharahm3249]

super sir ..

[@skyadav137]

thank u sir

[@Jacksparrow-ti1oq]

thanku sir