PN Junction Diode (Reverse-Bias Condition)
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- เผยแพร่เมื่อ 24 มี.ค. 2016
- Analog Electronics: PN Junction Diode (Reverse-Bias Condition)
Topics Covered:
1. Reverse-bias condition.
2. Comparison of depletion layers in case of no-bias, forward-bias and reverse-bias condition.
3. Comparison of barrier potentials in case of no-bias, forward-bias and reverse-bias condition.
4. Current due to majority charge carriers and reverse saturation current.
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Loved your comment.
This is literally saving my degree....
Ikr🤣🤣🤣
You are awesome sir. I am living in Korea who is studing electrical engineering. I always wanted to say that I really appreciate these lecture. Thank u really a lot
임재성 korea
What is your electrical engineering syllabus? does these include...!
thank you so much, i would never understand the pn junction without you. realy awsooooooome
you are doing great job sir..
thnk u sir....u r actually my dream teacher...thnk u lot....
Thank you sir, very nicely explained all concept
Excellent explanation 🔥
I fall in Love with your explanation ❤️ 💖 sir
I need a problem about this subject, where can I find? help me please.
Thank you very much
Dear Sir, I just want to know that how that Vb line is drawn in a upside incline format.
nice explanation
THANK YOU SO MUCH
Very good explaination
Super explanation sir👍👍👍👍
+Neso Academy Hi. I wonder why the holes and electrones near depletion region disappears first and make depletion region wider. I mean why dont those holes and electrons at near right and left edges of diode neutrileze by the voltage source first since they are closer to the voltage source?
Does the saturation current in reverse bias condition remained same as the no bias condition becoz the saturation current depends only on temperature?
Thank you very much sir🥳🥳🥳🥳
Thank u than u thank u thank thank thank u soooooomuchhhhhhh i was not able to understandit for so long thank u
Thanks :)
thank u sr
How depletion capacitance changes when the diode is in reverse bias? How to find the depletion capacitance using CRO? Please solve my doubts on this.
Maybe a silly question, idk about the symbol of electron and holes, but it should be like negative - for electron and positive + for holes right??
Thanks
Awesome....❤️
Hello sir,
Holes in p- side are majority carriers, so how does the current due to the movement of holes(attraction of holes by -ve terminal) in pside become minority carrier current ??
sir,why we take reverse bias characteristics in third quadrant?
Because p type is connected to negative terminal and n type to positive. Moreover, direction of current flow is opposite to forward bias.
Why are the Ions that carry holes drawn with a Negative symbol and the Ions that have an extra electron drawn with a Positive symbol? Shouldn't it be the other way around?
My question was Why? i'm confused
But if an ion has a hole then it is a positive ion isn't it? and if it has an extra electron then the ion is negative?
This answer helps thank you
Ty
is the reverse saturation current drift or diffusion current?
Thank u .....
sir wouldnt the reverse saturation current increase also because of the increased barrier potential???like holes on n side will be carried to the p side because of increased electric field from right to left???in that case saying that reverse saturation current depends only on temperature would be wrong,isnt it?
In case of reverse n forward bias ....after knee voltage...the currents in both the situatiin increases...what is the nature of two currents n their physical importance ie where both the currents are used.
2024 and still no reply
sir...the reverse saturation current is drift current or diffusion current???
I think it is the drift current at it opposes the movement of the majority charge carriers
Nice
u r awesome
plz differentiate drift current and reverse saturation current??
when we reverse pn junction why there no electrons pass from the negtaive thermal of the battery to p type junction ?
Why electrons should do it? :)
It happens that's why potential barrier gets thick
What do u mean by uncovered ??
it means the associated electron/hole with the atom has recombined and so now you don't have electrical neutrality
Half and full wave rectifiers
can we say that diode is bi directional
because in it current also flow due to both charge carriers electrons and holes
it is due to the rectifiers in the diode.
forward bias --> closed switch
reverse bias --> open switch
Super
Sir I have a doubt- Since depletion layer is formed due to diffused current. Then why if depletion width is increasing in reverse biased then diffused current not increasing inspite decreasing ??
Diffusion current is due to the diffusion of charge carriers(e- and h). In reverse bias, this won't happen in accordance with the increase in depletion region thus diffusion current decreases even though the width increases.
Plz don't relate in such a way like that we do in math.Understand the situation rather thats all.
Why the width of the depletion zone stops growing up?
In reverse bias condition the width of depletion layer starts increasing since the direction of flow of electrons has changed.
A diode can withstand only a certain amount of reverse bias which can cause only a particular amount of depletion layer width.
The depletion layer never reaches the entire width of p-n junction as by then a breakdown has already occurred and no properties of diode are left.
Thus there is no depletion layer or barrier is left and the avalanche breakdown takes place.
There is a limit of everything!
Width of depletion zone depends on applied potential .Only till u keep increasing d potential width increases as majority charge carriers r drawn towards terminal.
I dont understand why there are some holes located on the N side when there are already positive ions and electrons there. And the holes are only few.
Rahimah Jofferi : these holes r the minority carriers at n side that r formed due to external thermal effects in othrwise intrinsic semiconductor before doping.
Why u draw upside line at 1:07
Because Barrier potential increases from zero to a particular value Vb due to recombination....
in no bias condition, diffusion current is equal to drift current under steady state. In reverse bias condition, diffusion current becomes zero while reverse saturation current is very small (in micro ampere). Is drift current the same as reverse saturation current (which both of them are due to minority charge carriers)?
gr8 vdo
Sir is reverse saturation current and drift current same?? Because both the current is produced by minority carriers???
I think so yeah
Why does no current flows through a diode in Reverse bias mode?
in fact there is a weak saturation current, but diffusion current is nearly zero, as the barrier voltage is getting greater.
In reverse bias the depletion region keeps on increasing till the potential difference across the depletion region is equal and opposite to the potential difference of the battery. Due to this, the pn junction diode offers resistance hence the majority charge carriers can't go against that resistance so current doesn't flow.
hllo sir i cant undersatand why. ......in reverse bias current ki low
no diffusion no current.
I read that in reverae bias condition electric field in the depletion region decreases. I dont understand the reason . Please clarify it.
Where did you read it? Instead, the electric field would be enhanced when applied reverse voltage.
You are wrong. The reverse bias enhances the electric field as the charge carriers would be repelled and make the job of field easy and thus improves fields functioning.
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hello sir, your videos are very helpful.Thank you for your contribution.please help me with the doubt ,why the depletion region expands from the center ,in reverse bias condition electrons from battery when enter p region will merge with the hole at the very beginning,so there should be a barrier at the battery terminal....why center...will expand??? m very confused please help.Regards!
Can you be more clear with your question?
+Meghjit Mazumder when in reverse bias electrons enter the p type SC electrons should combine immediately with the hole when it enters so der should be a depletion region near the terminal ....but here it is shown that the depletion region from centre expands ...how????
Yes,you're right in a way,but,there is a slight conceptual error.Look,in the reverse-bias,when electrons come from the negative terminal and enter into the P-region,it should immediately combine with the holes and it really does.As a result,we have there negative immobile ions,but then there is the "catch" you actually miss it.After forming those ions there,the lack of holes are filled by the holes from the adjacent ions(towards the depletion region) and thus the process continues.Finally we have the negative immobile ions at the original depletion region,having no other ions(which can supply holes).So they remains in that form and they are added with the original depletion region.
Similar treatment goes for the other side(N-side).If you still don't understand,let me know.
Meghjit Mazumder brother I don't understand some part which you were talked with her. How electrons come from negative terminal of battery in reverse bias ? In reverse bias current flow from right to left
Battery dekh k to forward bias me lag raha hai.
Binod
sir,remove the subtitle,can't see the written words
time waste
You are awesome sir. I am living in Korea who is studing electrical engineering. I always wanted to say that I really appreciate these lecture. Thank u really a lot
Thanks