PN Junction Diode (No Applied Bias)
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- Опубліковано 8 вер 2024
- Analog Electronics: PN Junction Diode (No Applied Bias)
Topics Covered:
1) PN Junction.
2) PN Junction Diode.
3) Meaning of Biasing.
4) Diffusion and Diffusion Current.
5) Depletion layer or space charge region.
6) Drift Current.
7) Barrier Potential.
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Discussing electron and hole movement is like describing a picture and it's mirror image at the same time. A complete understanding of P-N junction theory can be done with electron flow alone. Dr. Shockley invented the idea of "holes" because it greatly simplified his math. But it is unnecessarily confusing and .adds nothing but extra work to the physical understanding/
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atoms can't be moved.they are in circle+minus or hole
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Sir , seriously I am saying that...it is the best video on pn junction in UA-cam...I have many questions on it so see almost other's channel video....but it's best because it give me every question answer...but sir if you explain more on drift current as like diffusion current..it will superb...thnx again
yes sir
it is true
@@grandhivamsi9710 I refer one more that's Khan academy pn junction video...check this
Thank you so much for explaining so deeply ❤️
Drift current is not only because of minority charge carriers.Drift current is electric current due to the motion of charge carriers under the influence of an external electric field while diffusion current is electric current due to the diffusion of carriers leading to a change in carrier concentration
Exactly
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Sir In video You told that the negative charge will repel the eletrons and don't let them to come in p side but the +ve ion layer on P side should also attract the eletrons ( as there is concentration difference ) and No longer remains Uncovered
Hi , there is no +ve ion layer on P side.
I think it may also be due to the electric field force repelling them. So overall no movement takes place
Hole is a vacant space created by the valence electron (when it moves from its own place) ,but how a hole is moving from one place to another
Koduru Sindhu actually hole is not moving in the semiconductor....hole is a relativistic concept...... only electrons are moving...and vacant position of electron is called hole.... relatively holes are moving not actually.....in reality only electrons are moving
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Will you make a video about Fabrication methods of PN junction sir??... Please, I am really understanding the topic to the fullest from your lectures. So, was asking this favour sir!!!! :(
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Sir according to theory discussed....the drift current flows after the diffusion stops ...so there will be some time difference between drift and diffusion current so why we are taking them equal??
Ofcourse there should be a time difference till the depletion layer is achieved.Steady state is achieved once the depletion layer is formed and actually there is negligible flow of majority charge carriers and so is the case with minority charge cariers.In practicality the drift current is very less so we take it equal to the duffusion current.
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Sir can you pls make a video on explanation on energy bands of n and p type semiconductors !!
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Nice sir.
why donor atoms aren't negative ?please anyone explain
Thank you for making these videos : ) Could you explain what it means for a hole and an electron to recombine?
Hole is a place where an electron coul be bound, but there is nothing ) So when free electron and hole meet each other, there is going to be no hole and a bound electron.
Yah
Thanks a million ✌️
Thank u sir i got full clarity in this subject. But kindly let me know whether u have lectures on network theory
Do you see a search bar on top of the browser? I think it should help you :p
Please why are the donor ions in the n type semiconductor positive?
where as the impurity atom used is phosphorus and its negatively charged
so helpful!
At 16:20
In depletion region why there are electron and holes present
As it is depletion layer there should be no charge carriers
So why they present
Watched it at 2x speed. Understood better!
thankyou so much sir .
Nice but
1.what is steady state?
2.why diffusion current=drift current at steady state?
because a equilibrium state occur. Drift current is the opposite of diffusion current as we know drift current flow due to electric field and diffusion current flow due to the difference in concentration of majority carriers. Now steady states means no current will flow that means the two opposite current i,e drift current and diffusion current are equal and this state is called steady state or equilibrium state.
Arin Saha
When the concentration of Majority Charge carrier is not equal to Minority charge carrier than how drift current can be equal to diffusion current. Your explanation is not correct.
Excellent sir🔥
super and nice explanation
Please what’s the breakdown voltage of a pn junction diode and how it’s calculated ?
thank u sir making these vedios,sir I have a question that is- when barrier potential formed then diffusion current will be zero then how in stade state condition diffusion current =drift current also tell how we get drift current after formation of barrier potential.plz clear my doubts
good explanation..
tq sir😊
i don't understand one thing in this video that is u already told that depletion layer does not contain any flow of charge but minority carriers are giving drift current
Useful !!!!!
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NICE
Thank you
IES INterview question why we can't able to measure the built-in potential of the p-n junction by using a voltmeter.?
What's the answer brother ??
@@sobankumar4927 barrier potential is inside the material, how can you measure it?
If we keep voltmeter there exits another potential difference which is opposite to the existed ones and hence both get cancelled so we can't measure the built in potential.
We couldn't measure this built in potential because there exist a counter potential(at terminals) which cancells with the built in potential (to satisfy the law of conservation of energy )
I looked into this myself. If the potential were externally measurable, you could derive infinite free energy from them. You could just connect a wire and have current flow with no battery, since you have a potential, current would flow. But that violates conservation of energy. So the metal contacts cancel out this potential. Look up ohmic contacts and metal-semconductor junctions for more information.
Thankyou Sir
thank you so much
In depletion region the electron is recombined with hole so there ion is converted into atom. But how there is still ions are present?
All the not recombine some will stay alown
what is meant by uncovered charges
Thanks
Biasing is application of voltage accross 2 terminal.
But is it biasing with respect to DC voltage or AC voltage?
Thank you for the video by the way.
DC in this case
Can You explain how the immobile electrons surface out so that depletion region formed, Similarly how the drift current obtained if the depletion region consists of only immobile electrons....?
electrons are mobile, the ions are immobile,
thank. you. so. much sir
How can the hole move through the depletion layer. I think only the electrons will move because they are mobile.
Can it is also for b tech first year electronics
Dear Neso academy, i have a doubt , will you clear it for me?
Diffusion layer: Absence of free carriers but immobile Donor and acceptor atoms will be there. The free carriers hole and electron will recombine. While recombination, what happens ? what happens when hole and electron recombines? Do they cancel out ? if so where will their masses go? ( You said mass of hole > mass electron in previous lecture). Recombination result please explain.
Hey can you draw out the energy diagrams for these diodes please?
I think p type are positevely charged carriers u mentioned n type y sir
How do electrons and holes combine? If an electron goes to a hole, it creates a hole in its previous position. How can there be no electrons or holes in the depletion region?
why p side has negative signs and n side has positive signs ?
Sir !! In the lecture you told that drift current is equal to diffusion current , can you please elaborate it ? I am not able to understand that thing .
Yeh. They are the majority carriers and other one is minority, how come both produce same current ?
Plz use white colour while writing. As other colors are not visible to me.
Sir loss in electron and formation of holes are different
Sir why diode is called as minority charge carrier device, can you explain please?
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tnx
At the depletion layer possitive layer repel the holes but it attracts electrons is possible,so is it depletion region increases?
I like it
Super
How diffusion current =drift current ....as minority charges are very less compared to majority charges.. Please 🥺 explain
Thanks alot bro! but kindly explain the point that Whole is equivalent to positive charge ? thts y it repels the whole and similarly the negative ions repel electrons when depletion region is formed.If it is so than why there is diffusion current on start ?
Hole*
🙏
Why is drift current equal to diffusion current. I can't figure it out.
Βecause it's open circuited. Since no internal current is flowing in, no current will flow out, thus making the two opposite-directed currents equal (referring to their absolute values, since diffusion currents goes from P to N, while drift current goes from N to P)
How is the current contributed by majority charge carriers equal to the current contributed by minority charge carriers in steady state ? i.e.,how is diffusion current equal to drift current ?