Solar Power is a renewable source of energy because its powered by the sun. When sunlight hits the surface of a solar panel it knocks electrons free from atoms, to generate of flow of electricity. Solar panels are made up of photovoltaic cells, the cells are made of two layers of semi-conducting material. To create an electric field the layers are “doped” with other materials, creating a positive and negative layer. Phosphorus is added to the top layer, which adds extra electrons creating a negative layer. They add boron to the bottom layer, which results in less electrons equaling a positive layer. The top layer is known as the N layer, and the bottom is knows as the P layer. The meeting of these two layers is known as the N/P junction. When sunlight hits an electron free, the electrical field pushes that electron out of the N/P junction. Metal plates in the panel collect the electrons and transfer them to wires, where the electrons flow like a typical source of electricity.