A solar panel is a device that responds to light and converts light energy into electricity. There are many kinds of materials that can produce photovoltaic effect, such as monocrystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, selenium and other copper. Their power generation principle is basically the same, now crystal as an example to describe the photovoltaic power generation process. P-type crystalline silicon doped with phosphorus can be obtained N-type silicon, the formation of P-N junction. When the light is irradiated on the surface of the solar cell, a part of the photons are absorbed by the silicon material; the energy of the photon is transferred to the silicon atom, so that the electrons are moved and the free electrons are formed on both sides of the P-N junction to form a potential difference. When the circuit, in the role of the voltage, there will be a current flowing through the external circuit to produce a certain output power. The essence of this process is the process of converting photon energy into electrical energy. Crystal silicon solar cell production process: "silicon" is our planet, one of the most abundant storage of materials. Since nineteenth century scientists have discovered the semiconducting properties of crystalline silicon, it almost changed everything, even human thought.