How many layers do solar panels have?



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    The average solar panel consists of four different layers.  On top of the panel there is a clear protective coating, which is made out of silicon.  The middle two layers are also produced from silicon, however they are specially treated in order to serve as an “electrically charged junction” between the top and bottom layers.  Lastly, the bottom layer consists of a “tough polymer backing.”  In addition to these four basic layers, the panels are sometimes framed to make them more durable.  Oftentimes the silicon may be substituted for lighter, more flexible materials.

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