Continuity Equation Semiconductor Derivation Part 1

[@ranu021]

Others were trying to explain through definition but you were explaining it like a kindergartener could understand thankyou very much for making it easier

[@406giridharchikka4]

best video in internet world to understand the eqation of continuity

[@granthoffman8682]

This stuff is killing me in school. So interesting, but very difficult. Your videos are a godsend. Thank you sir.

[@TerranIV]

Wow, thanks for this very thorough and eminently understandable explanation of such a vitally important concept in semiconductors! I haven't been able to wrap my mind around this all semester but I think I finally get what's going on here. Thanks so much!!!

[@JordanEdmundsEECS]

You are welcome! Glad you are finally able to wrap your head around it, it's probably the most challenging topic in intro semiconductors. I had to learn it several different ways before I finally started to understand what was going on.

[@xonisak]

when dividing ∆V throughout the equation, dp/dt side is not zero, shouldn't there be a 1/∆V on the dp/dt side? @ 6:52

[@moritzhuck7575]

P (total number) goes to p (Number Density or total Number per Volume)

[@ManiAvila]

Thanks, I was having the same doubt when dividing by ∆V

[@atd9945]

very easy to follow. thank you

[@theillusionzone]

4:54 "Since this is the total amount of charge added...." Err no Jordan; since you multiplied the current density by area dimensionally it must be the 'total amount of current added'.

[@BRUSCKORB]

incredible video

[@Arun-bk1fq]

Sir, continuity equation relates only minority carriers or it is also applicable to majority carriers?

[@JordanEdmundsEECS]

Great question, it makes some approximations which are only valid for minority carriers.

[@suruchiverma48]

One question sir. At 3.55, on the left hand side it is dp while on the right hand side it is ∆V. Why not ∆p or dV?

[@jordanedmunds4460]

Excellent question. I'm approximating the derivative using a finite ∆V, implicitly assuming that the time derivative is a function of the small volume element. dV would be more in keeping with calculus notation, and would work just as well.

[@zharaalipanahi8084]

Thanks 🙏

[@lorebarta1698]

Wow thanks

[@girivardhangiri4324]

Drift current mrans

[@girivardhangiri4324]

Means

[@abdelmoulabakal3047]

@@girivardhangiri4324 maybe the answer is late but the drift current is the current caused by the electric field

[@ly3282]

why bother subtracting recombination rate and adding generation rate?cuz G=R, they get cancelled

[@JordanEdmundsEECS]

Initially we assume that G=R, but strictly speaking this is only true under steady-state. Transiently, it isn’t true. Additionally, G and R might actually be functions! (Of space or time), and so to solve the continuity equation you need to include their full functional form.

[@yomamafatoshi]

Solar cells as an counterexample where G is larger than R (hopefully haha)

[@magnetar_spc]

which program do you use for the notes?

[@JordanEdmundsEECS]

These days I use photoshop, but I used to use sketchbook.