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SOLAR CELL

Science student has some problem to understand, how a solar cell works and they also seek science assignments,
so I'm just creating a  small blog on it.
this will help to understand a little bit about solar cell working 






so the first question arises in your mind what is solar and its manufacturing?

It is a device which converts light energy into electrical energy.

 Working:

It works on the same principle as photodiode except for the  fact that no battery connected across it
the solar cell works in 3 steps:

  1. as soon as radiation of suitable frequency is incident on the region of the depletion layer with energy (hv>Eg) gap. electrons and holes are separated in the depletion region 
  2. Due to the electrical field of depletion layer holes move towards the p-type end and electrons move towards the n-type end.
  3. A potential difference is created (p-type end attains higher potential and n-type end attains lower potential) therefore a current flow in the outer circuit which can be obtained across the loop resistance. 

The material used for making solar cells:


  • High light absorbing ability 
  • the energy gap between the conduction band and valence band should be 1e.V -1.8e.V.
  • cost should be minimum and easily available
  • electrical conductive
Note:
Junction area kept large for solar radiation to be incident because it gives more power.

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