Solar cells - fabrication & material's used | Semiconductor | Physics | Khan Academy

[@akhilseelam3741]

00:01 Solar panels are constructed using specific semiconductor materials.
01:10 Depletion region and photovoltaic effect explanation
02:19 Balancing wire thickness and absorption area for reduced resistance
03:33 Solar cells use finger-like projections for efficient absorption and electron flow.
04:37 Solar cells require photon energy higher than band gap for electron absorption
05:43 Selecting the best semiconductor material for solar cells
06:54 Different semiconductors absorb photons differently based on their band gaps.
08:06 Efficient solar cell construction materials

[@niranjan7457]

Sir, at 01:52
For photons to reach the depletion region, instead of reducing the N region, can't we just flip the whole block by 90 degrees clockwise, so that the depletion region faces upwards and everything proceeds as usual...

[@KhanAcademyIndiaEnglish]

Excellent question. That, however, would be impractical because, from the side, the depletion would have a very tiny area.

[@jesusda26]

The explanation is AMAZING!! Thank you Sir for the effort and dedication. You helped me a lot!

[@moldomosbah7081]

U are a star !

[@0rdinary_guy]

At 8:42, I think it's worth mentioning that gallium arsenide is toxic. Hence, it's less commonly used.

[@ayushpagey1343]

Thank you sir and team for the efforts...just a request can you keep the donation value flexible so that we can donate in our capacity...

[@samiramammadova4942]

Great explanation thank youuuuu!!!!

[@h7opolo]

4:08 that's what i was looking for, thanks

[@computerlover9290]

Wow Indian education seems amazing

[@EC__MohammadArshad]

khan academy is pakistan based not indian .

[@computerlover9290]

@@EC__MohammadArshad what do you mean?the guy has indian accent.

[@khushisingh2163]

Best video on this topic..

[@sunsetandrain]

Thank you so much.your videos save me before every exam

[@iamevelynkirabo]

Thank you for this 🙏🏽

[@vaishnavivaish1596]

First...🎊🎊.
I did a working model of solar system ....Nd won fst prize in state level...
Congratulate me...sir

[@mohitrewri1660]

congratulations dear .

[@deepgandhi6269]

Hyy... Which metals mostly used in solar cells

[@EC__MohammadArshad]

@@deepgandhi6269 about 90 percent solar cell are made from silicon.

[@abhinandankalia6971]

Very good explanation

[@syedtehmeenaandrabi4338]

Could you please explain the concept of anode and cathode?

[@lewtube6436]

OK, but how do you get a PN junction from gallium arsenide? My guess is this. Half of it is doped with a little extra gallium to make the P type, and the other half a little bit of arsenic for the N. It appears to me that gallium arsenide in itself plays the role of plain silicon, which does not conduct. Am I right?

[@deepgandhi6269]

Sir in N-type semiconductor we use Zno?

[@jatinkadge7297]

Thank you very much for the explanation. Sr. on 5:41 you told about the energy of majority of electrons coming from sun is E = 1.5 ev. Will you please explain it. I tried finding the energy of majority of electrons on net. However, i couldn't find it. Is this value an assumption or fact. Please answer. Thanks in advance.

[@watsoncrick6071]

A graph is there to explain the spectrum of energy in the photons from sunlight, in the ncert class 12 physics book...you can refer that

[@madhusudhany.v44]

Sir ,why electrons love to stay at lower energy level,as you explained electrons absorb 1.5ev but fall to 1.1 ev level in silicon by dissipating heat energy?what feature make electrons to love lower energy level?

[@watsoncrick6071]

lower energy levels corresponds to more stability, therefore electrons likes to be in lower energy levels

[@robertoguerra5375]

Everything, even electrons love to stay at lower energy… or accidentally go to lower energy, but can’t move up to a higher energy.

[@hkvamshi8754]

First view..

[@vivekgupta3692]

First view