Extrinsic semiconductors P-type | Class 12 (India) | Physics | Khan Academy
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- Опубликовано: 28 мар 2018
- In this video, we will explore the P-type semiconductors.
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Class 12 Semiconductors: We cannot imagine our life without computers today. But what makes a computer tick? What's making this technology grow at such an exponential rate? It's all due to semiconductors. As unbelievable as that might sound, altering the properties of semiconductors allows us to build these computers. In this topic, we will explore the world of semiconductors. It's a journey from what semiconductors are all the way to creating building blocks of these computers.
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Created by Mahesh Shenoy
excellent explanation, no body can explain so nicely and effectively. god bless
this is one of the best explanations that i have ever heard
what an awsome teacher u r....loved the way you explained
Doping is dope!
Flawless 👌👌👌👌👌👌👌👌👌
So very well explained. Thank you for your work.
His explanation is so great.Love your voice.
great stuff!!!
Amazing explanation
Very helpful sir 👍
*THANK YOU* 🙏
How is the acceptor/donor level place in the band energy is decided?
Good explanation. I've also seen some other of these videos and they're really helpful.
There are more electrons than holes in P type semiconductors. Isn't it how they're involved in conduction that makes them called the majority charge carriers?
Owsom content
Wow
Sir, is the point for this process of conduction that the electrons present is Ea state can conduct electricity and it now doesn't need to enter the conduction band as it had to in intrinsic ones ?
God level teaching
Sir in extrinsics more holes present in valence band then what is the use.
Thankyou.
Nice software
Really Nice videos
Seeing them for about 2 years and everytime I see them my concepts become more sharp.
I loved it 🤘🏻❤
A question comes up. With N type doping, electrons move into the conduction band. This is easy to see, But with P type, it appears holes have not moved up there because these are not real particles. And it looks to me as if the electrons coming out to leave holes behind do not move into the conduction band either, but into the acceptor band, which is lower down. So how can conduction occur? Or put it another way, does P-type doped Si have higher resistance than N-type?
Sir,why can’t the electrons in the acceptor level jump to the Conductance band, if we used the Group 12 atoms..?
Sir, could u please tell me , how the electrons from the valence band ( which is of silicon) , occupy the vacant spaces of acceptor level , which is actually present in the forbidden energy gap( in which electrons of Si atom ) are forbidden to enter...?
Now you know the answer ?
If yes then please explain me
I have the same doubt
When you added Boron it has its own energy levels that's why
Without Boron(the acceptor aka the begger), Si electrons have large forbidden gap, can't cross the gap easily, with boron there is an newly created energy level wanting to be occupied (although this energy level belongs to Boron). Si electrons now have something close to move upto, so they do move at certain temperature.
Forbidden band is forbidden until we have an energy level.
What software does he use? Any ideas?
¡Thank you!
in the last video you told that group 16 cannot be used in n type because the donor level of group 16 is too low ,so the V.B electrons can't move to donor level, leaving a hole behind?
Let’s forget physics here, if you go by the meaning of donor, it means giving and acceptor means accepting something. So being a donor, it already has extra electrons, why will it accept more? Got my point?
Donor level should be close to conduction band (it can DONATE easily)
Acceptor level should be close to the valence band (it can ACCEPT easily)
Should the doped Boron's energy band be a "band", instead of a line as in the video?
Sir, can you explain why the acceptor level and donor level for different elements move towards valance band or conduction band ?
I think that's beyond the scope our syllabus.
We need to use quantum mechanics to compute the energy levels of the acceptor and the donors.
After doing all the calculations it turns out that group 13 elements have the acceptor level close to valence band and for group 15 the donor level close to conduction band.
@@KhanAcademyIndiaEnglish For group 15, that may be because the electron not involved in bonding has a lot of repulsive force.
Is there a playlist that explains the basics up to this video?
Yes. Check the 'semiconductor class 12 CBSE' playlist
Hey can u please tell that how electrons in valence band are mobile and in conduction band immobile..
Who says electrons in conduction band are immobile they are also mobile.
@@electronicswithmadhan1052 No... Basically the electrons in Valence Energy band are immobile as they are covalently bonded with other atoms, while electrons in Conduction energy band are actually free electrons that reached at that energy level due any kind of energy forms... So as they are free they have mobility...
Can I get the pdf of this ?
Sir why electrons will go there since it’s forbidden energy gap for silicon electrons
Sir what will happen if we use germanium or any other semiconductor materials instead of silicon.
I think the same mechanism is applicable over other elements that are generalised in Semiconductors...
Nothing happens, we need to dope the particular group 15/13 atom which is having least size difference, that's the only difference
Hi.. what is the energy level of silicon hole? Is it same as boron?
Please reply.
Waiting for your reply.
same question
Silicon hole in valency band, boron level is slightly above I.e in acceptor level, pls correct me if I made a mistake
While making this a p type semi conductor why boron is used for si won't there any be size prblm, how will boron fit the picture
Diagonal relationship of B and Si,
Which helps B to dope with Si
why can't the group 13 element Aluminium be used instead of Boron?
Aluminium cannot be doped with Si, but Si can be doped with Aluminium
Possible P-dopants = {B, Al, Ga, In} = all group 13 = trivalent
Possible N-dopants = {N, P, As, Sb, Bi} = all group 15 = pentavalent
Sir, your teaching can change way of thinking or looking at subjects. Really doing great
3:32 what math are we talking about
Math related to the equation tells about energy of shell
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Excellent but Hinglish is benifit me