10:28 if someone is wondering about the equation 1/(total_mobility) = 1/(mobility_phonons) + 1/(mobility_ionization) -- [0] , consider the collisions per second in each category.. collisions_per_second_phonons = (charge/effective_mass)*(1/mobility_phonons) --[1] collisions_per_second_ionization = (charge/effective_mass)*(1/mobility_ionization) --[2] total_collisions_per_second = (charge/effective_mass)*(1/mobility_total) --[3] total_collisions_per_second = collisions_per_second_phonons + collisions_per_second_ionization --[4] [1] through [4] will lead to [0] Of course if your math is fresh, then all this is not required, its the probability of any of the two independent events (collisions due to phonons or collisions due to ions) occurring
@Neeraj-is1jt5 ай бұрын
At 10:23 how can he say mobility due to phonon and mobility due to impurity atoms, shouldn't the mobility is due to charge carriers like electrons or holes?
@pvaishnavi86155 ай бұрын
Mobility is caused due to scattering and scattering is because of impurity and phonons
@Neeraj-is1jt5 ай бұрын
@@pvaishnavi8615 ok thanx for the contribution
@louerleseigneur45322 жыл бұрын
Awesome Thank you very much sir
@alanjoy79155 жыл бұрын
Nice lecture
@NidBM3 жыл бұрын
Trueeee
@tarutewari4 жыл бұрын
sir the lectures are commendable but if you could just name them it would of great help thanku
@freeandreliablejeeprep82011 ай бұрын
thank you v and krishna
@madagalarajasekhsar37394 жыл бұрын
excellent .
@freeandreliablejeeprep820 Жыл бұрын
thank you sir
@ahmedatifabrar7698 Жыл бұрын
At 34:05, it's diffusion current density, not diffusion current.
@andydufresne4363 ай бұрын
@16:00 flux = nv_d. Isn't flux a kind of total, at the moment.. a quantity which increase with area considered. E.flux is total field lines in an area or a plane, at the moment.. ( E.field is force per charge at the moment ). n (unit = cm-3) , v (unit = cm.s-1) . So here, flux is something per area per second , which doesn't increase with the area considered.. Can anyone explain, how it is flux in this equation??
@madagalarajasekhsar37394 жыл бұрын
why half of the electrons only move from either sides
@KaviPriyan-qt6vc4 жыл бұрын
same doubt
@vikramaditya49593 жыл бұрын
@@KaviPriyan-qt6vc when there is no field applied then due to thermal energy probabilistically half move left and another half move right as the motion is random
@madagalarajasekhsar37394 жыл бұрын
sir how high doping results in lesser mobility
@gautamjha8294 жыл бұрын
yes,you can relate when concentration increases Speed decreases .
@hari41604 жыл бұрын
High doping will result in more number of impurity ions which causes more scattering which results more collisions ,less distance Hence mobility decreases as tow decreases
@Neeraj-is1jt6 ай бұрын
At 3:40 how mobility is different for different material , as it depends only on effective mass of electron?
@BPHVAIBHAVSHARMA12 күн бұрын
Because effective mass also depends upon the potential it is going through and hence material.
@080vyas93 жыл бұрын
sir at @27.28 how can u say that exactly half goes right and half goes left as the concentration is more on the left side
@animeshgautam61972 жыл бұрын
since its a random motion therefore its probability will be 0.5
@Neeraj-is1jt5 ай бұрын
At 10:23 how can he say mobility due to phonon and mobility due to impurity atoms, shouldn't the mobility is due to charge carriers like electrons or holes?
@andydufresne4363 ай бұрын
μₚₕₒₙₒₙ : Mobility of carriers (electrons or holes) due to the effect of _phonons_. μᵢ.ᵢₘₚ : Mobility of carriers due to the effect of _Ionised_ _impurities_. - each define the mobility due to the respective condition. _Mu_(total) gives the *actual mobility*.
@baluanyam87513 жыл бұрын
00:26
@sanjusingha17143 жыл бұрын
Note 11:55 21:35
@MrVishalbharti4 жыл бұрын
Dear sir, there is an error at 31:48 time. The value of delta x should be 2l not single l. Please check it.
@utkarshpandey65084 жыл бұрын
No, my friend. It will be l. Take the points on curve at height nL and nR. They are l distance apart.
@madagalarajasekhsar37394 жыл бұрын
@@utkarshpandey6508 how it is l bro
@utkarshpandey65084 жыл бұрын
@@madagalarajasekhsar3739 delta x = (x not + l/2) - (x not - l/2) = l/2 + l/2 = l