I'm doing a project on solar energy and was researching up how PV cells work. I wound up at www.howstuffworks.com
and was reading through the info they have available there, i understood some of the material until they began describing the "electric field/diode" part. I understand that it is important that this field exists to give direction to the current but i dont really understand how it is formed.
"Do all the free electrons fill all the free holes? No. If they did, then the whole arrangement wouldn't be very useful. Right at the junction, however, they do mix and form a barrier, making it harder and harder for electrons on the N side to cross to the P side. Eventually, equilibrium is reached, and we have an electric field separating the two sides."
..that just makes...no sence to me...Okay we have the electrons moving from the Nside to the Pside, therefore making the Pside negative and the Nside positive (..er right?) ...and then i guess that makes it more difficult for the remaining electrons on the Nside to move to the Pside because the Pside has less "holes" (..getting more lost
) ...is that what creates the electric field? is that what the electric field is
? Why cant all the electrons fill all the holes? Is it because the cell is designed to have an excess amount of electrons?
...yeah *stares at floor* ....im lost now...after they talk about the diode being able to push electrons from the Pside to the Nside ...i dont understand how that idea came to being because i dont think they explained why.(or maybe im blind)
Anyway, if anyone can help explain this to me or answer my questions it would be greatly appreciated.