In minute 9:25, you say that when we shine the laser, the concentration of minority charges (holes in this case) goes from p0 to p0+GL*Tp, where Tp is the lifetime of the holes. I don't understand why this is the case. Why does it involve Tp? Shouldn't it be GL*T where T is the time the laser is on?
If the laser is on for T, the number of generated carriers would be GL*T, but the number of added carriers won't be equal to that since so many carriers recombine too. That's why Tp (which is the carrier lifetime) is used.
Sir can u please tell the major difference between recombination , Direct recombination and steady state injection . it's creating a lot of confusion .
Injection: is adding more carriers => can be done by light incidence or forward bias (in case of diode) Recombination: conduction band electron combines with hole in valence band => resulting in a valence electron => electron concentration (in C.B) and hole concentration (in V.B) reduces. Direct Recombination: They recombine directly - without the help of intermediate states.
thank you sir got a bit clarity , but is it true that in case of recombination and direct recombination we do not apply any voltage across the the semi conductor and the electrons in C.B itself try lo lose its energy and fall in the V.B to recombine with holes .
i barely understood anything. u bring in new variables without explaining. might as well skip pointless derivations and just cut the video short and more relevant
+yashfernandojain I hope you are watching these videos in series. This video is part of a playlist, and the videos are meant to cover derivations with necessary assumptions explained. It's your wish to skip the derivation. Thank you for commenting. Thanks, Techgurukula.
very hardcore and math-intensive, it took me at least half of a hr to figure out everything. Love it!
good lecture sir, please change the icon to reach more people.
In minute 9:25, you say that when we shine the laser, the concentration of minority charges (holes in this case) goes
from p0 to p0+GL*Tp, where Tp is the lifetime of the holes.
I don't understand why this is the case. Why does it involve Tp? Shouldn't it be GL*T where T is the time the laser is on?
If the laser is on for T, the number of generated carriers would be GL*T, but the number of added carriers won't be equal to that since so many carriers recombine too. That's why Tp (which is the carrier lifetime) is used.
very informative...
Thank you great presentation.
excellent
I even forgot my name after watching this video
is law of mass action valid for steady state e.g voltage applied across a semiconductor?
Sir ,Please explain tou at 7:50. from where it came...
β and n_no are both constants, so we define them as tau, and its unit just equals time's unit.
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Thanks
Sir can u please tell the major difference between recombination , Direct recombination and steady state injection . it's creating a lot of confusion .
Injection: is adding more carriers => can be done by light incidence or forward bias (in case of diode)
Recombination: conduction band electron combines with hole in valence band => resulting in a valence electron => electron concentration (in C.B) and hole concentration (in V.B) reduces.
Direct Recombination: They recombine directly - without the help of intermediate states.
thank you sir got a bit clarity , but is it true that in case of recombination and direct recombination we do not apply any voltage across the the semi conductor and the electrons in C.B itself try lo lose its energy and fall in the V.B to recombine with holes .
Hi Rahul,
I would suggest you to watch the videos in series - follow this playlist:
th-cam.com/video/HRt0_TlxAl4/w-d-xo.html
Thanks,
Techgurukula.
U is the recombination rate of excess carrier which is equal to the generation of excess carrier GL.
Muhammad Ibn Wahid Thanks
please explain:----- dp/dt = d(pn-pn0)/dt
Konsi book se yh topic pdhe
Streetman and baneerjee...by the way he is teaching excellent and in depth
+techgurukula Thanks for the video!!!
i barely understood anything. u bring in new variables without explaining. might as well skip pointless derivations and just cut the video short and more relevant
+yashfernandojain
I hope you are watching these videos in series.
This video is part of a playlist, and the videos are meant to cover derivations with necessary assumptions explained. It's your wish to skip the derivation.
Thank you for commenting.
Thanks,
Techgurukula.