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is possible LED can replace photo voltaic cell

gobikannan kulandaivelu22
Prodigy 40 points

i have received some small voltage across led array  when it was kept in sun light. is it  possible

  • 0
    Prodigy 5 points
    Hello Gobikannan,

    You have observed a lesser known phenomenon of LED’s.

    When solar light enters an LED, the photons in the light which has wavelength equal to the band gap of LED penetrates deep into the PN junction. On absorbing energy from these photons, the electron hole bond at the PN junction breaks and result in accumulation of electrons in the n side and holes in the p side. So, p side will be more positive than n side. This makes anode positive and cathode negative. Hence, LED acts as a cell.

    The voltage produces is below 1.5V, current is generally low, less than 1mA.
    You can put them in series and parallel to make a higher voltage, higher current solar panel.

    There are several references on the internet.