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Assertion (A): A p-n junction diode with low junction depth can be used as a solar cell when illuminated by suitable light (wavelength) at the top thin layer above the junction. Reason (R): A p-n junction diode under no condition can be used as a solar cell. It can be used only as a light-emitting diode for optoelectronic applications.

Assertion (A): A p-n junction diode with low junction depth can be used as a solar cell when illuminated by suitable light (wavelength) at the top thin layer above the junction. Reason (R): A p-n junction diode under no condition can be used as a solar cell. It can be used only as a light-emitting diode for optoelectronic applications. Correct Answer (A) is true, but (R) is false

Solar cells (photovoltaic cell) is an electrical device that converts light energy into electrical energy through the photovoltaic effect.

  • It is a p.n junction diode with a construction that is different from the conventional p.n diode.
  • A very thin layer of p-type semiconductor is grown on a relatively thicker n-type semiconductor. We then apply a few finer electrodes on the top of the p-type semiconductor.
  • These electrodes do not prevent light to reach the p-type layer.
  • When light reaches the p-n junction, light photons easily enter the junction through a very thin p-type layer symbol:

 

∴ Assertion A) is true, Reason R) is false

Related Questions

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