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Solar Cells – What are they really..?
- Subbu R Subramanian
The Photo Electric Effect
When light waves of appropriate wave length hit an atom, the
electrons of the atom get excited. The excited electrons jump out of the
orbit, making the atom an ion. This movement of Electrons causes
Electric Current.
Albert Einstein found this phenomenon in 1905. He was awarded
Nobel Price for Physics for this finding.
•Different element’s atoms get excited with different wave
lengths of light . (different colour lights )
Ex : Sodium with yellow band light, Potassium with green
band etc
Various Wave Length Bands of the Spectrum
The “Catchments Area” for the Solar Cells.
Compounds can make use of the Energy
in 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 past
Decades and its Current Efficiency Status
...a lot needs to be done in perfecting PV cells……
...and the road ahead…

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Solar cells - What are they really

  • 1. Solar Cells – What are they really..? - Subbu R Subramanian
  • 2. The Photo Electric Effect When light waves of appropriate wave length hit an atom, the electrons of the atom get excited. The excited electrons jump out of the orbit, making the atom an ion. This movement of Electrons causes Electric Current. Albert Einstein found this phenomenon in 1905. He was awarded Nobel Price for Physics for this finding.
  • 3. •Different element’s atoms get excited with different wave lengths of light . (different colour lights ) Ex : Sodium with yellow band light, Potassium with green band etc
  • 4. Various Wave Length Bands of the Spectrum
  • 5. The “Catchments Area” for the Solar Cells.
  • 6. Compounds can make use of the Energy in Multiple wave bands
  • 7. UV side of the spectrum gives better power than IR
  • 8. The Anatomy of a Solar Cell
  • 9. The Path the Technology traveled in the past Decades and its Current Efficiency Status
  • 10. ...a lot needs to be done in perfecting PV cells…… ...and the road ahead…