When the surface of the solar cell and the electrode on the back side are connected with each other, a current flows.
For solar cells formed by the combination of two different silicon semiconductors (P-type and N-type), when the sunlight is irradiated, the solar light is absorbed by the solar cell to produce positive ions (positive holes) and negative ions (electrons) The positive ions are assembled into the P-type semiconductor, and the negative ions are assembled to the N-type semiconductor.
The structure of solar cells is diverse. Now, PN-type solar cells composed of P-type semiconductors and N-type semiconductors are used. They are mainly composed of P-type and N-type semiconductors, electrodes, and antireflection films.
The type of solar cells can be divided according to the materials used: silicon solar cells, solar cells and organic semiconductor system of solar cells.
