I'm sorry for such a repetitive comment, but I need to say: thank you for your videos. They are fantastic and explained so well. I'm using them to help me in my college class. My professor is amazing but getting two different, well stated explanations is vital for my learning process.
@sujoypaul18744 жыл бұрын
I am whole heartedly thankful to you for these simple videos,so ordinary students can understand complex topics
@zworm993 жыл бұрын
I just have to say this whole semiconductor physics series is fantastic! I´m a physics engineer student from Sweden currently taking a course in solar cells and unfortunately our textbook is lackluster to say the least and our teacher not too pedagogical (not to mention hard to reach due to the current pandemic). Your videos really helps with the intuitive understanding of the subject and they make me even more excited to become a great physicist! Thank you!
@barneycasting8331 Жыл бұрын
I was in an interview panel where we interviewed Jordan Edmunds for a position, now I am watching his videos to teach my students! 😂😂😂
@katieruland68512 жыл бұрын
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.
@djoumana549 Жыл бұрын
I study this on my 2nd year of university in algeria and in english .. I didn't have any better videos than yours Thank u for ur videos ❤️
@crazy1azy Жыл бұрын
بالتوفيق same here 🙏
@stef-e6y3 жыл бұрын
I have my renewable energy exam soon, this really helped me out with PV systems!!! Thank you
@lichifang6322 жыл бұрын
I was completely confused by my lecturer until I watched your video. Thank you so much!!!
@kavidiss79594 жыл бұрын
Honestly the best explanation. I was dying to find one😭 thank u soooo much.
@shuvamoy_uchiha_itachi3 жыл бұрын
After 7 years understanding it in a wholesome manner. Thanks for the beautiful explanation ❤️
@robertcanberkozturk77253 жыл бұрын
im ded
@HygienicFoodswithHumairaАй бұрын
Thank you so much! It's the bestest and such a precious explanation for me! Your channel is such a Gem.
@somawesome5 жыл бұрын
I wish I found these videos earlier.
@rockspoon65284 жыл бұрын
I wish I'd LOOKED for these videos earlier.
@robertcanberkozturk77253 жыл бұрын
nope
@SnoopGotTheScoop2 жыл бұрын
@@rockspoon6528 BRUH SAME
@SnoopGotTheScoop2 жыл бұрын
midterm in 2 days 🥲
@lwazidick4018 Жыл бұрын
I'm writing semester in an hour.
@Tritonmac2516 жыл бұрын
Thanks for the great and really helpful explanation!
@JordanEdmundsEECS6 жыл бұрын
Thanks :D
@MinuteMayne2 жыл бұрын
I think it's essential to explain why the holes and electrons move in the first place: diffusion by chemical potential gradients.
@kiro92914 жыл бұрын
my god you made pn junctions a cake walk! thank you
@suleyman_ct3 жыл бұрын
Proper accent deserve a hug.
@tomfa65075 жыл бұрын
I wish my professors from the past could explain things like you do, you should become a college professor if you aren't already!!
@Mido-gi1gw4 жыл бұрын
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.
@JordanEdmundsEECS4 жыл бұрын
Almost. Precisely how I think of it up until the “as they are traveling” part. They aren’t repelled by the other mobile charges (because there’s lots of ions there too balancing them out, so no electric field). They instead diffuse into the opposite region and *recombine*, which is how the ions in the depletion region get “revealed” for lack of a better world. It is these ions that are responsible for the electric field and prevent further diffusion. Far away from the depletion region, the semiconductor is still neutral (it has both its electrons and positive ions, or holes and negative ions). The mobile charges don’t make it very far before they recombine.
@sharvani61334 жыл бұрын
The explanation is so clear. Thanks!
@jiayiliu91283 жыл бұрын
These thoroughly explained videos helped me a lot! Thanks
@emanueltraiger60924 жыл бұрын
Some Feynmanish quality of explanation right here
@JordanEdmundsEECS4 жыл бұрын
This made me smile
@Upgradezz4 жыл бұрын
Huge honor that.
@robertcanberkozturk77253 жыл бұрын
this comment right here officer
@blakepeters22492 жыл бұрын
Thank you so much for this well explained summary
@loscienzo4 жыл бұрын
Very helpful 🥦 Thanks a lot! The black background is also appreciated
@JordanEdmundsEECS4 жыл бұрын
Thanks! You get an award for first comment with a broccoli 🥦 emoji.
@ashrafhussein30282 жыл бұрын
thanks for this help. am now free from loss of marks. thanks much. I appreciate
@JordanEdmundsEECS2 жыл бұрын
Hahaha glad to hear!
@gekinmepan7 ай бұрын
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.
@gekinmepan7 ай бұрын
Electrons moving towards the junction in the P-type region leave behind holes which counteract their negative charge. Similarly, holes moving towards the junction in the N-type region leave behind electrons.
@zaeemAtif5 жыл бұрын
LOVE, LOVE and LOVE....!!!
@rosskappa54104 жыл бұрын
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.
@JordanEdmundsEECS4 жыл бұрын
Eeeeeexactly. You are correct on all points. You can think of holes as a "mathematical trick" that make our physics a lot easier to work with. Best of luck in your quest to understand this very rich subject :) If you want to go deeper I'd recommend taking a class on thermal physics and/or quantum mechanics.
@rosskappa54104 жыл бұрын
Wow thank you so much for the answer. The weird thing is I didn't come across with this explanation of holes. Can't say I've studied the books deeply but i'm dissappointed that it wasn't even mentioned in my class. And for the promise I've made, i did it. Thank you for the videos.
@Odiskis14 жыл бұрын
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
@JordanEdmundsEECS4 жыл бұрын
Yup, you’re precisely correct, except for one subtle point - recombination does not change the net charge in a particular region, as it removes both a positive and a negative charge with no charge - so the E-field will remain after recombination. Other than that you’re exactly correct.
@Odiskis14 жыл бұрын
@@JordanEdmundsEECS Thanks for a fast reply! You "destroy" both hole and electron at the same so the net charge stays the same. That makes sense! Thanks again
@AnsImran3 ай бұрын
Which sources did you use?
@zharaalipanahi80842 жыл бұрын
I understood diodes very well , thanks 🙏🙏🙏🙏🙏🙏🙏🙏🙏❤️
@mattcorrigan66394 жыл бұрын
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
@lenafd3 жыл бұрын
because electrons immigrate to the p region to fill in the holes
@mp3lwgm3 жыл бұрын
Very “physical” and valuable.
@assmazurba98102 жыл бұрын
thank you so much!!
@nnamdiene24003 жыл бұрын
Great video!
@joshuafernandes36245 жыл бұрын
youre the man
@AnshulSharma19973 жыл бұрын
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?
@lies42123 жыл бұрын
why P-type or N-type is neutral although there are minorities in the two sides?
@oraange4 жыл бұрын
How do you define a "electron hole " ?
@JordanEdmundsEECS4 жыл бұрын
Imagine a bunch of people sitting in chairs, and at first every chair is filled (or every electron occupies a state in the valence band). Then, one person gets up and leaves (an electron goes to the conduction band). There's now an empty chair (an empty state in the valence band), and the people next to that empty chair are free to move in it, or if you think about it backwards, the empty chair (the hole) is free to move.
@kimtaehyung4353Ай бұрын
My study ASMR 😂
@xAmiSarahx4 жыл бұрын
I like it....
@distrologic29252 жыл бұрын
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.
@mikeearls1264 жыл бұрын
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....