Why doesn't photo voltaic cells erode ?

Discussion in 'General Electronics Chat' started by Michael George, Mar 26, 2015.

  1. Michael George

    Thread Starter Member

    Feb 8, 2015
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    2
    I've read about photo voltaic cells which converts the solar energy into electrical power. I find out that when they receive photons (light), the electrons of a photo voltaic cell are able to move freely and produce electrical current. I know that any material consists of electrons, protons, and neutrons. So I imagine that .. when electrons leave a photo voltaic cell, It should have less mass and it should start to erode or to be ionized and converted into another material. Am I right ? If no, how photo voltaic cell recover the loss of electrons ? I don't think photons of sun light replace the electrons !! because they just motivate electrons to move freely by giving them some energy. I also, thought the same Idea about piezoelectric material. when we give it a mechanical energy , it produces electrical current. does that mean it will erode ?
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
    5,675
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    Look at it like an electric generator or even an in-line water pump. What goes out is returned. The generator, PV cell, or water pump just provide motive force. There s no net loss of electrons.

    This reference is a little more detailed: http://org.ntnu.no/solarcells/pages/Chap.4.php

    John
     
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  3. upand_at_them

    Active Member

    May 15, 2010
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    Don't think of the PV as a finite source of electrons. Think of it as a facilitator of electrons.
     
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  4. crutschow

    Expert

    Mar 14, 2008
    12,991
    3,226
    A PV cell generates an EMF to move the electrons from the positive to negative side of the cell in a continuous stream through a conductor connecting the two sides.
    There is no net loss or gain of electrons.
     
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  5. Papabravo

    Expert

    Feb 24, 2006
    10,136
    1,786
    It also takes 1837 electrons to equal the mass of one proton.
     
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  6. JDT

    Well-Known Member

    Feb 12, 2009
    658
    85
    But the charge is the same (but opposite).

    A current of 1A is 1 Coulomb (of charge) per second. A coulomb is 6.241509×10^18 electrons.

    Just thought you would like to know that!
     
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