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Old 04-07-2006, 02:07 AM
dheeru_x dheeru_x is offline
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Default Solar energy

Sir,
I would like some help with my science project. I would like to know how electricity is generated when light falls on photosensitive substance(camera film). When I tried to concentrate solar energy on the film using a magnifying glass, only 0.01 volts of electricity is passing. How to increase the current flow and voltage using same technique?

Are there any projects that can be done, to avoid accidents viz. road and rail.

dheeru_x
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Old 04-25-2006, 04:23 PM
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theBman theBman is offline
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Default

i dont think light hitting camera film generates electricity.(correct me if im wrong) but i know how solar pannels work. there are two thin layers on a solar pannel. P-doped silicon and N-doped silicon (sorry, i have no idea what these are, it was all my science textbook said about solar pannels). the photons hit the P-doped silicon, and somehow exite the electrons so that they jump from the P- doped to the N-doped. the electrons the go through a wire connected to the N-doped, pass through an electrical device (eg a calculator) back through another wire, and back to the P-doped silicon.
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Old 04-27-2006, 07:37 PM
bereal511 bereal511 is offline
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Default

P-doped means that the silicon matrix has boron or aluminum impurities purposely set inside to create a missing charge in the silicon. Ignoring periods, the dashes and lines below represent crystal matrix bonding between the atoms. Notice the missing bond with boron. The bottom middle silicon atom has no electron to bond with. (This silicon crystal matrix would continue in the same fashion throughout the solar panel)

Si - Si - Si
|.....|....|
Si - B - Si
|..........|
Si - Si - Si

The other part of the solar panel would be the N-doped material. This means that an impurity of phosphorus is added to the silicon matrix in the same fashion as the P-doped silicon matrix, except with phosphorus, there is an overabundance of charges. It would be represented as this:


Si - Si - Si
|.....|....|
Si - P - Si
|.....|\...|
Si - Si - Si

There is nothing the phosphorus can bond to with its last electron, so there is a difference in charges between the P-doped and the N-doped materials. Sunlight causes the excitement of electrons, which flow from the overabundant sites of electrons to the sites lacking electrons, creating a flow of charge.

Last edited by bereal511; 04-27-2006 at 07:40 PM..
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