PN Junction Introduction 

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EE masters student and have taken probs 8 classes between now and undergrad where the depletion region of pn junctions/devices is discussed and I've never seen a good explanation and this is great.

After 7 years understanding it in a wholesome manner. Thanks for the beautiful explanation ❤️

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I think it's essential to explain why the holes and electrons move in the first place: diffusion by chemical potential gradients.

my god you made pn junctions a cake walk! thank you

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Some Feynmanish quality of explanation right here

So in Summary, In a pn junction, there are four types of charges, movable and unmovable postive and negative charges. The movable postive charges are located in the p-type and the movable negative charges are located in the n-type. Both types are neutral though due to the existence of the opposing unmovable charges. When the p-type and n-type come in contact with each other, some of the movable opposite charges migrates to the opposite type. As they are traveling, they are repelled by the other migrating movable opposite charges, such that the opposite movable charges migrates at the extreme side of each type. The repulsive field created by the moveable charges contains only the unmovable opposite charges, which are constructs the depletion region. In conclusion, the pn-junction consists of 3 regions, the postive region, the depletion region and the negative region.

The explanation is so clear. Thanks!

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Very helpful 🥦 Thanks a lot! The black background is also appreciated

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Very “physical” and valuable.

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So can we say that depletion region is only formed by the immobile acceptors and donors which I think you call them ions, which are the ion form of the impurity atoms such as B^-1 for Boron and F^+1 for Phosphorus? and... silicon or any impurity so to say ANY ATOM can not actually move or physically diffuse through the silicon, they are stable where they are, only thing moving is holes and electrons created by them? Isn't hole movement is directly caused by electron movement? When we are talking about hole and electron diffusion, actually there are not 2 particles moving to diffuse to each other. There is only one particle which is electron that tries to diffuse to holes, and the thing we called "hole diffusion" occurs by itself, directly related to electrons when they diffuse since electron is going to leave behind a hole. If you could please answer these... you'd make me and my friends very happy and I promise I will click 40 ads or any number you give +40 that is feasible :D I will do it. Thank you so much for the videos, deeply trying to understanding something is so satifying.

Why do you say that there are negatively charged bound ions in the p region, and positively charged bound ions in the n region? My intuition tells me the p region has an excess of holes due to positively charged ions

So the diffusion current creates a net charge that again creates an electric field that stops further diffusion? But wouldn't that make the electric field disappear since all diffused charge carriers will recombine and the charge difference would disappear? Is this something that always goes on, but we model it as a stable situation where all free charges are pushed back? I feel like I am missing something or that I've been overthinking this

youre the man

in the depletion region does the immobile ion causes an electric field or there are electrons and holes which diffused causing an electric field to exist. Moreover its is safer to say as due to no net movement there are no further diffusion but still is we see by diagram, what causes the electron and holes further movement. Is it the immobile ions or what that repel them? And this electric field is created in the space charge region of immobile carrier?

why P-type or N-type is neutral although there are minorities in the two sides?

Great video!

thank you so much!!

Can someone explain why, at 6:06, the electrons on the P-side arent being pushed back into the N side by the electric field. It seems like electrons are only reactive to an electric field on the N-side. Not on the P-side. This doesn't make sense to me.

When forward biasing, will more electrons fill the holes in p-type so that these electrons repel other coming electrons from n-type ?(as electrons fill the holes in p-type and repel more coming electrons from a battery's negative terminal when reverse biasing

I have always been confused by how the electrons and holes start being repelled by the junction at some point. But now it makes sense. Once equilibrium is reached, the outside parts are charged and attract their respective particles, while the junction is neutral and does not.

Omg thanks a lottttttt

How do you define a "electron hole " ?

depletion region junction introduction

It was this simple????

I like it....

DR. KURT LEHOVEC

This shit is really cool - who knew? I mean I'm a 52 year old inquisitive person so probably many people knew but I don't think any in my orbit....uh...hahahaha....ugh....

EEciler ses verin.

طلاب السادس البه ربكم 😂😂

took me a while, but finally clear w the concept! thanks a ton !