Thank you for such helpful lectures. It would be highly appreciated if you can add a short lecture on degenerate and non degenerate semiconductors into this playlist too.
I'm a medical graduate and don't even know what brought me here! lolz ..but after your magnificent explanation ? ,I feel ready to get my first Nobel prize in Physics! hahahahah wish if you have a twin but in Medical field! .Thanx! . :)
@@amoghshetty4867 The initial system is an excited electron while the final system is a relaxed electron + photon. So you need to take into account the momentum of the photon to have conservation of momentum just like he didn't for energy.
Could you please explain how momentum is conserved in case of direct band-gap recombination when a photon is produced, as photon also carries some momentum
Momentum is conserved when there are no external forces acting in ...so in direct semiconductor no external force is playing a role in the releasing of photon. Hence momentum is conserved.
i think that the photon comes from the potential energy thus not effecting neither kinetic energy nor (therefore) momentum. the indirect one needs a change in potential and kinetic energy (p^2/2m), therefore effecting the momentum. But im not exactly sure either.
Shaona Bose. You night want to appreciate the lovely presentation. Perhaps you were just having a bad day. When something very nice is offered, and your immediate response is to criticize, you show yourself to be a rather limited individual.
I have to congratulate and thank you for this crystal clear explanation.
Excellent..!!!
all are awesome videos...exactly what i wanted..why didnt u come up with them earlier??
thank you so much n continue the good work.
very well explained .
thanks alot.
This is very useful, helpful and well explained. Thank you.
Nicely explain 👍
It is very useful and explained clearly, Thank you.
Thanks alot sir please upload more video that we understand more topics in chemistry
It was very helpful. Thanks for your time
Thank you sir
Thank you for such helpful lectures. It would be highly appreciated if you can add a short lecture on degenerate and non degenerate semiconductors into this playlist too.
Well explained
I'm a medical graduate and don't even know what brought me here! lolz ..but after your magnificent explanation ? ,I feel ready to get my first Nobel prize in Physics! hahahahah wish if you have a twin but in Medical field! .Thanx! . :)
OMG! you are the best for this video! Thank you so much!
Very well explained😊
well explained..keep it up
thank you very much, very helpful and clear explanation.
still best explanation in 2020
nice work !!
thank u sir.. well explained
finally a decently made video
Thank you. i have learned a lot
This video is like neso academy ...
well done
Sir why do we consider hole on the top of valence band
Tq it is help full to me
nice
Thank you for the video, could you explain what crystal momentum is please:)
Thanks! It was really helpful! :D
Thank you
hi great video but i have a question : what is it in the case of two maximums?
Which book to follow Sir?
How can you have conservation of momentum in the direct gap, the photon also have momentum ?!
I think he is talking about the momentum of the electrons.
@@amoghshetty4867 The initial system is an excited electron while the final system is a relaxed electron + photon. So you need to take into account the momentum of the photon to have conservation of momentum just like he didn't for energy.
Could you please explain how momentum is conserved in case of direct band-gap recombination when a photon is produced, as photon also carries some momentum
Momentum is conserved when there are no external forces acting in ...so in direct semiconductor no external force is playing a role in the releasing of photon. Hence momentum is conserved.
i think that the photon comes from the potential energy thus not effecting neither kinetic energy nor (therefore) momentum. the indirect one needs a change in potential and kinetic energy (p^2/2m), therefore effecting the momentum. But im not exactly sure either.
Electron has same momentum before and after the transition. so, momentum conserved.
clear!
thanks
which book to follow?
ben streetman is a nice book
Thank you brother
Is K beyond the scope of this lecture?? Really??
The big yellow thing is distracting. -_- And the addition of energy states for the indirect bandgap semiconductor could have been elaborated.
Shaona Bose. You night want to appreciate the lovely presentation. Perhaps you were just having a bad day. When something very nice is offered, and your immediate response is to criticize, you show yourself to be a rather limited individual.
Thank you