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B Solar cells - how do they repeat the process?

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  1. Nov 10, 2018 at 7:06 AM #1
    Hey everyone,
    I have to do this presentation about solar cells and how they work. I've been doing a lot of research, and now I know a lot about how they work. However there is just one thing, that I can't understand.

    So in a solar cell there is an N-type and P-Type. The N-type has too many electrons, and the P-type has these holes. When the sun shines on a solar cells, it strikes the electrons in the N-type out, and the electrons fill out holes on the P-type. And electrons that moves are what we know as electricity.

    But when all of the electrons move to the P-type and fills out the holes, how does the solar cell repeat the process when there aren't any more free electrons on the N-type and the holes on the P-type has been filled with the free electrons?
     
  2. jcsd
  3. Nov 10, 2018 at 8:11 AM #2
    A solar cell is way more complex then the model you described. However, in the same framework, I'd say the external circuit (the solar cell charges a battery) takes care of "replenishing" the "sea" of electrons (N side) and holes (P side).
     
  4. Nov 10, 2018 at 9:56 AM #3

    marcusl

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    Electric current flows in a closed loop, so the wire that carries electrons away from one side brings them back to the other.
     
  5. Nov 10, 2018 at 9:41 PM #4

    davenn

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    yes, exactly

    no compete circuit outside the cell, no current flow across the internal structure of the cell
     
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