How is solar power generated?
Each solar panel is made up of lots of individual solar cells. Each of these cells (often manufactured using polysilicon) is made up of various layers – a bit like a solar sandwich – with different conductive coatings applied to them.
Typically the top layer of silicon is doped with phosphorus to give it a negative charge, whilst the bottom layer contains boron to give it a positive charge. These opposite charges, in turn, create an electric field at the junction between the two (positive and negative) silicon layers.
The solar magic happens within each cell. Here, where photons (or particles of light, to you and me) collide with atoms in the cell, this causes electrons to break free. Once an electron is released, it’s carried out of the silicon junction by the electric field, described above.
From here, the electrons flow from the cell and through an external circuit (via an inverter, which turns the electricity from DC to AC) where they’re then able to get to work powering your home appliances.
Once all their hard appliance-powering work is done, it’s time for the electrons to return back to the solar cells before repeating the whole process again, and again, and again… Pretty smart, hey?
Still struggling to get your head around solar power? We think the animation below helps explain the process really well.
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