Diffusion Current for Electrons and Holes

[@JordanEdmundsEECS]

There is an error at the end of the video, Dn should not include the "q" term, and so Jn = q*Dn*dn/dx

[@manuelvivaan3658]

Sorry to be off topic but does anybody know of a trick to log back into an Instagram account..? I stupidly forgot the password. I would love any assistance you can offer me.

[@khalidjamari8386]

@Manuel Vivaan Instablaster :)

[@manuelvivaan3658]

@Khalid Jamari I really appreciate your reply. I found the site through google and im trying it out now. I see it takes a while so I will reply here later when my account password hopefully is recovered.

[@manuelvivaan3658]

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[@khalidjamari8386]

@Manuel Vivaan you are welcome xD

[@sender1496]

I'm impressed by the level of pedagogy you're using. Intuitive explanations, drawings, and the concept of this "sledgehammer" that prevents you from losing the grasp of the bigger picture... I love this

[@JordanEdmundsEECS]

Thank you :)

[@xltian4368]

Thanks for the video. But I am still confused by the Dn. Dn is delta X * V_th, and then what should be delta X? So far, delat X looks more like a variable to me and I don't see how Dn can become a coefficient. Hope to get your reply. Thanks in advance. It's a wonderful job to create this series of videos.

[@lailachokri2852]

in our cours my teacher used dx instead of Delta x in the diagram and we've been told that dx means a very little distance( as dt means a very short time, dv for elementary volume or a very little volume..) and this delta x Equivalent to dx ( i think) so it stands for a very little distance and not a variable. i hope that makes sense and doesn't makes you more confused :D

[@xltian4368]

@@lailachokri2852 thank you so much. yes, your explain makes good sense.

[@bryamayvar6590]

Hi, do 50% of the electrons always pass like this? or did we just arbitrarily pick that? Also, thank you so much for this series!

[@JordanEdmundsEECS]

In general if you just plop a bunch of electrons at a single point in space, they will (statistically) diffuse uniformly outward. In 1D, that means 50% will move to the right and 50% will move to the left. It's basically quantizing the diffusion process into discrete steps.

[@mowafaqsharat3170]

Thanks A lot Jordan edmunds ,we are gratitude to your "very clear" presentation ,Mowafaq Sharat /Amman-Jordan

[@govindsinghdawoli]

What a teacher you are just amazing.......,

[@JordanEdmundsEECS]

:) And by spreading positive feedback, YOU are amazing.

[@christinalyka2828]

i can't understand. When we use the taylor series shouldn't dn/dx be the derivative of n(x) at x=0; How do we use the formula for every x we want?

[@jacobvandijk6525]

Until I saw this video I thought I understood the concept of a diode. But now I know I didn't !!! ;-) Thanks, Jordan.

[@cdmoraleda]

Thanks a lot for this videos, they help so much in understanding everything about semiconductors, i'll have to add you to the thanks section in my final project jaja Just one question, wich software you use to do the drawing?

[@JordanEdmundsEECS]

Sketchbook

[@suhailbhat1996]

If Jn diffusion and Jp diffusion have opposite direction. Why are they shown flowing in same direction when dealing with PN junction diode at equilibrium.

[@vikasverma4263]

Great explaination

[@jasonmiller6424]

what are the units of Dn?

[@JordanEdmundsEECS]

length^2/time (typically cm^2/s)

[@praneethrajula1809]

How did +delta X and -delta X came into calculation. 😭😭 Please explain

[@aarondahl1181]

+ delta x is the initial position on the x axis plus x (an amount of space on the x axis). delta x = x_0 + x. Negative delta x = x_0 - x.

[@Upgradezz]

Shukriya