Solar cells - What are they reallyPresentation Transcript
Solar Cells – What are they really..?- Subbu R Subramanian
The Photo Electric EffectWhen light waves of appropriate wave length hit an atom, theelectrons of the atom get excited. The excited electrons jump out of theorbit, making the atom an ion. This movement of Electrons causesElectric Current.Albert Einstein found this phenomenon in 1905. He was awardedNobel Price for Physics for this finding.
•Different element’s atoms get excited with different wavelengths of light . (different colour lights )Ex : Sodium with yellow band light, Potassium with greenband etc
Various Wave Length Bands of the Spectrum
The “Catchments Area” for the Solar Cells.
Compounds can make use of the Energyin Multiple wave bands
UV side of the spectrum gives better power than IR
The Anatomy of a Solar Cell
The Path the Technology traveled in the pastDecades and its Current Efficiency Status
...a lot needs to be done in perfecting PV cells……...and the road ahead…