Solar cell is a lightweight, responsive and able to convert light energy into electrical. Photovoltaic effect can produce all kinds of materials such as silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, indium, selenium, copper. They are essentially the same principles of power generation is now crystal as an example to describe the process of light generation. P-type crystalline silicon doped with phosphorus available via N-type silicon, the formation of PN junction.
When light radiation surface, a portion of photons absorbed by silicon material, the transfer of energy from photons to atoms of silicon, so that the electronic transitions were and become a free electron concentration in the PN junction formed on both sides of the potential difference when the external circuit connected while under the influence of tension,laptop battery rechargeable there will be current flow in the external circuit produces an output given. The essence of this process: the conversion of photon energy in the process of electricity.