Temperature-dependence of carrier concentration

[@sudhirjaiswal6864]

is lecture me jo maza hai wo mai desh ke har ek vyakti ko dena chahta hu

[@randomyt5358]

To pappu banja😂

[@omartusson]

Thank you very much. I'm taking a course in semiconductor physics in which the professor just goes over slides without bothering to explain anything. I couldn't understand anything from him and got confused on many occasions. These videos helped me a lot.

[@suvarchana7990]

are u from mnnit?

[@hemantj675]

Super simple and super easy. Thanks professor

[@madagalarajasekhsar3739]

excellent teaching.anyone can understand

[@louerleseigneur4532]

Awesome Thank you very much sir

[@Syz68]

Vice nice teaching sir

[@vinodshet27]

Thank you professor Very informative and no need to go through textbooks I believe. Very helpful for me.

[@nitishgupta169]

12:49..... Sir what do we mean by n=0 Is it mean that no electrons is left in SC. WHERE DO intrinsic electrons gone ? If n=0 then equation , np = ( intrinsic carriers)^ 2 not valid??

[@anchalkumarchaubey3027]

@@nitishgupta169 but it is for that only when n-type and p-type both co-exist together and sir assume that Nd =0 , it means no extra electron get added in SC material

[@anchalkumarchaubey3027]

@@nitishgupta169 Intrinsic electron always present in SC, this cannot be changed in any circumstance but the condition for n=0 is for when n-type and p-type happen together, it assume .In reality it have some value which is very small in comparison to hole, that's why sir taken n=0. np=ni^2 it always hold in equilibrium conditions, here also hold.

[@deepstudywithamitkumar4124]

Brilliant maza a gya

[@swtghs]

❤❤❤❤maja aagya... iisc is iisc❤❤

[@AMITBAROI-l8k]

many many thanks, Sir🙏

[@divyasingh6503]

Happy teacher's day sir.... Due to u ...Now i can understand semiconductors as well.

[@nitishgupta169]

12:49..... Sir what do we mean by n=0 Is it mean that no electrons is left in SC. WHERE DO intrinsic electrons gone ? If n=0 then equation , np = ( intrinsic carriers)^ 2 not valid??

[@allamnaveen7622]

@@nitishgupta169 At 12:49 n ~ 0 that means n is nearly equal to zero or very less in numbers, the equation np = ni^2 is still valid if u use exact numbers instead of approximate numbers

[@nitishgupta169]

@@allamnaveen7622 thank u for clarifying it . I was thinking that no of electrons is exactly zero.

[@岳不飞]

@@nitishgupta169 the concentration is relatively too small so you can assume there is no free electrons inside approximately

[@nitishgupta169]

@@岳不飞 thanks🙂

[@adhirajmankotia9598]

Good lecture

[@freeandreliablejeeprep820]

thank you very much sir

[@tekkenworld8262]

Wish that you were my semiconductor professor 🥺🥺

[@GoodmanMalaya9291]

❤❤❤🎉

[@Neeraj-is1jt]

I am tired of asking the same question At 16:09 how can electron be present in the forbidden energy gap(Donor energy level)?

[@snehasuren]

Electron does not exist in the gap it is for representative purposes only. Ed here only denotes the ionisation energy and hence placed very close to the conduction band. Any slight increase in temperature is enough to gather enough thermal energy to pull the electron from the donor atom and push it to the conduction band

[@Neeraj-is1jt]

@@snehasuren plz tell me the reference book where u get this answer ,I will be thankful to you

[@nitishgupta169]

12:49..... Sir what do we mean by n=0 Is it mean that no electrons is left in SC. WHERE DO intrinsic electrons gone ? If n=0 then equation , np = ( intrinsic carriers)^ 2 not valid??

[@yawarhayat5628]

​ @Nitish Gupta Actually n won't be ~ 0 rather it will be relatively very negligible in comparison to p. We obtain p first ( here 10^17 cm^-3 ), then we use law of mass action (np = ni^2) for computing n. In this example, n would be of the order of 10^3 cm^-3 which is very negligible in comparison to p.

[@nitishgupta169]

@@yawarhayat5628 thank u , there always comes a hope form unexpected side 🙏

[@sahulameed7145]

11:48 how NA-ND BECOME 10¹⁷ ?

[@HustlerMohit]

Sir you said, In intrinsic region too much electron leads to metallic behaviour. But Sir in semiconductor conductivity decrease as temperature increases?

[@amitkumar-sh2lk]

i think he did not said that it will behave like metal but he said that at high temperature intrinsic carrier concentraion increase so intrinsic current increase .

[@sudhirjaiswal6864]

you are talking about conductor ,semiconductor is opposite nature

[@baluanyam8751]

16:28

[@sudhirjaiswal6864]

this pn=ni2 is almost like water equilibrium constant