What's a Diode? Here's why diodes conduct one way but not the other | Doc Physics

STOP! WATCH THIS VIDEO FIRST • How Does a Diode Work?...
You may continue only if you feel comfortable with these concepts:
donor, acceptor, electron, hole, doping, built-in potential, "space charge" or "depletion" region

[@nizzy1999]

A video on transistors please! My book is impossible to comprehend and your teaching style is better than 107% of the rest of the internet

[@nataashakhattar5063]

Do a video on Transistors please sir!🙏 your explanation is the easiest to grasp😍 thank you for all the videos!

[@DocSchuster]

+nataasha khattar I'd love to, but it's so important that I'm procrastinating. It has to be just right, you know?!?

[@devilkanan]

+Doc Schuster I'd love it if you'd done it. You make it so simple and funny as well. I have transistors, rectifiers and all that stuff in high school syllabus and the books make it sound so scary. :(

[@shrinivasiyengar5799]

dude, seriously this is the first time since i've known about diodes (which is like 2 years) that i have actually understood what happens, & believe me i am not making any of this shit up! awesome work!

[@marcusmaldonado9132]

I am a sophomore, studying for my bachelors in science with a concentration on biomedical engineering. These videos have simplified the action of a diode and has helped me out tremendously. THANK YOU!

[@nourhanelmetwally4126]

so you are in college... I am a highschool senior and I take this stuff.... I really do hate physics!!!

[@marcusmaldonado9132]

Yeah, keep up the good work

[@thessavanlimbergen9846]

first i was thinking, this can't be usefull, the way he explains it... but this is actually the first video where i understand the mechanism, THANK YOU!

[@salonisingla1665]

Could you please do a video on transistors? Please?

[@banoshreebose2682]

Can you please add a video on npn and pnp transistors?

[@elenakoustova3240]

Thank You for the videos. I am studying for my electrical licensing exam and they did not teach this my Electronics class. Thank You again! :D

[@nicrule4424]

This... This is how you teach. Great job!

[@udithkumarv734]

Everytime I see this I understand better than before...❤❤❤

[@Captain_Rhodes]

am i right in assuming that the depletion region never goes to zero? it just gets tiny, so there is always a ''net'' Electric field

[@sahana2397]

Can you please make a video on Zener diodes?...thanx!...this one was damn good btw :D

[@preethin313]

You're the best😎A video on amplifiers and rectifiers please!!!

[@amylindsberg4810]

Thankyou sooo much! This was VERY helpful! You rock!

[@simonwintersteller6015]

Thank you soo much!!! - Great help for my physics coursework! :D

[@houstonchapman2521]

Nice video, very clear.

[@mattydill0586]

Thankyou so much for this video. A great way to understand the basics. Makes my study notes understanding (Studying Electrical Fundamentals , Semiconductors for Aviation) Cheers!

[@sunita2568]

Your videos are just amazing ..

[@SergeySingov]

During the reverse biasing, what's stopping the electrons which are right near the boundary to go from P-type region to N-type region? Electrons are negatively charged, and the other side is positively charged, so it seems that the electrons from the P-type region should easily cross the boundary and fly like bullets to the other side. What am I missing?

[@ANUPAM337]

Si atoms holding it and electrons already on n side repelling it.

[@RazaKhan-nl1gg]

How the current is passed through depletion region whether it has no free charge carriers in the conduction band??

[@reshmasudhesh6356]

In the initial case where you connected the battery, the external field was opposing the built in field, right? But then it was the built in field that stopped the depletion layer from increasing, right? Then shouldn't the battery in the first case lead to an increase in the depletion layer?

[@ANUPAM337]

Hey your first two arguments are right but they don't add up to give the third statement.

[@christiamfranco6231]

Thank you a lot for the video. It would be great if you explain a little bit further why in forward bias the depletion region dissapears but if you measure the voltage drop on the diode is 0.7V. Thats a concept that i can not grasp right away. Thank you

[@DocSchuster]

Great question. I'll look into it when I have a chance, but I hope someone else can answer it for you sooner. Any takers?

[@efab..]

Forward bias means delivering positive charges to the p-type and reducing negative charges from the n-type. To give a better view, think this again with electrons, that move in the opposite direction to positive charges. Now forward bias forces electrons out from the p-type layer. Guess which electrons are the easiest to kick out? The ones that make the negatively charged depletion layer in the p-type, the ones that recombinated upon creation of the diode. Reverse bias increases the width of the depletion zone.

[@nabilchoudhury4120]

sorry for all the questions but can someone explain the diode - current to voltage graph? in forward bias, i understand that the potential difference is meant to be much lower than when it is reverse bias. if this is the case, how does the higher voltage allow an 'almost infinite' current, as shown in the graph?

[@nabilchoudhury4120]

nabil choudhury *'almost infinite' conductivity

[@James_Haskin]

These were great! Thank you :D

[@mushfek]

Thanks a lot!

[@saraabdulaziz3764]

thank you you are amazing sir

[@AlyssonBrito_BR]

Amazing!

[@nabilchoudhury4120]

when the depletion zone is wider, more holes move right, and more electrons move left, doesnt this mean that the current can flow as the energy carriers are able to move? confused

[@nabilchoudhury4120]

nabil choudhury please answer someone who know physics

[@ANUPAM337]

Hello this current in reverse direction is called drift current I guess. It is for a very small span of time in the depletion region.

[@HM-dm3qg]

Interrrrrestiinnng!!

[@ritwikchakraborty3319]

It's very simple. If students will try they can understand it themselves

[@HM-dm3qg]

Then why were you here?

[@renny0317]

thank you!!!

[@balbin23]

According to some sources holes don't migrate to N side.

[@roomsystem7253]

I don't understand why the electric field points to the left

[@roomsystem7253]

+Annabel Marks Okay I looked it up and I think I get it. The electric field IS the moving electrons... and they move to the left... Silly me.

[@arnavjulka1674]

thanks a lot