Extrinsic semiconductors N-type | Class 12 (India) | Physics | Khan Academy

Impure semiconductors are usually called extrinsic semiconductors. In this video, we are going to explore the N-type semiconductors.
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

[gvcallen]

Why is this only on Khan Academy India? Should be on the normal Khan Academy for more people to see! Excellent content

[nguyenvanhongphuc]

I get goosebumps listening to these amazing explanations!!! Love it!!!

[udaypatel]

This channel is just awesome. It deserves the best. Really, the teachers here at KHAN ACADEMY are super cool and make our concepts crystal clear and much easy. Not like that at my school. Really hat's off. Salute from me.

[_rafiaahmad]

I AM SO THANKFUL TO THIS MAN 🙏
He explains wonders 💯

[-ritikjain]

I luv your teaching and you clear all my concept

[meashiqka]

Your explanation, voice and colourful graphical representation is very nice..

[balabhakti]

These videos are brilliant. I work for intel in components research. Enjoying your content !. Thank you Mahesh Shenoy

[chamodya.t.k]

Thank you soo much I 've always had a doubt abt this N type and P type being neutral but it never occured to me that the atom we add becomes an ion!🥴 Thank you soo much again for teaching the whole thing🤩

[manyasingla]

Its really helpful 😊. Thanks for clearing all the doubts

[alankritsharma]

wont the group 15 and group 13 elements that are used to dope the semiconductor have there own conduction bands separate form the si / gr atom's conduction bands?

[komalhayat]

this is called ''the best''

[vivekgupta]

Sir In Previous Video You Said That When An Electron Jump From Valance Band To Conduction Band It Leaves A Vacant Space Which We Call Hole.

By Same Logic In Doner Level Also When Electron Will Jump From Doner Level To Conduction Band Then It Should Also Leave A Hole In Doner Level.

In That Case In Extrinsic Conductor Also The Number Of Holes And Electron Should Be Equal.

But You Are Saying That In Extrinsic Semiconductor The Number Of Electrons In Conduction Band Is Greater Then Number Of Please Explain.??

[melissa_abbott]

If I consider a part of the crystal (like in the diagram), and consider a row, wouldn't there be multiple conduction bands (and valence bands) for each row? How does that explain the concept of 'free' electrons or the fact that in P-type semiconductors, the acceptor level of a Boron atom is at a lower energy level than the conduction band?

[aronhighgrove]

The name extrinsic means that something external was added, i.e., the material was doped.

[gunajothisekar]

Instead of doing this why can't we just use a conductor

[catharperfect]

Shockingly good explanation sir. I would like to subscribe to your magazine.

[LarryLovestein]

When the phosphorous becomes positive, and the electrons move to the conduction band, do the holes left move to the valence band or no?

[darshantl]

Hello Sir why phosphorus having energy level nearer to the conduction band???

[Fatima-omf]

5:59 why did he draw alot of electrons on the energy level of phosphorus?
he said that there should only be 2 electrons per energy level

[roshankumar]

Could you please explain why donor level of sulphur is close to the valance band?