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The most common type of solar panel used these days on homes and businesses are silicon based, these solar panels are made from melted silicon rocks, a little bit of a positive chemical element such as boron is added to the silicon to make sure the resulting silicon block or ingot has a positive potential. Once the silicon has cooled for days and hardened, the ingot has been sliced into thin wafers and the wafer is coated on one side with a negatively charged element such as phosphorus.
The combination of the positive boron infused silicon on one side and negative phosphorus on the other side creates a positive, negative or PN Junction. This is where the magic happens, the photovoltaic effect. Wires are then painted onto the wafer, providing a method to harness the flow of electricity, at this point, the wafer is a solar cell.

Source: http://dowhen.org/how-do-solar-panels-work-b7wneM2.html

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