메인으로

Photovoltaic power generation is a technology for transforming photovoltaic power directly into electric energy A mode of power generation using solar batteries that generate electricity from sunlight through photoelectric effects The photovoltaic power generation system consists of a module that includes solar cells, storage batteries, and power transformer.

Photoelectric cells designed to transform solar energy into electric energy. When light is emitted on the contact surface between a metal and a semiconductor or the PN junction part of a semiconductor, photo-electromotive force is generated as a result of photoelectric effects.

Cells that use the contact between a metal and a semiconductor include the selen photoelectric cell and copper sulfite photoelectric cell. Cells that use the semiconductor PN junction includes the silicon photoelectric cell that is used as a solar cell.

The solar cell is a semiconductor represented by silicon and has been developed based on the advancement of semiconductor technology and semiconductor characteristics.

The solar cell has a structure that combines two semiconductor types with different electric properties: N (negative)-type semiconductor and P (positive)-type semiconductor. The border between the two semiconductors is called “PN junction”.
As the solar cell comes into contact with solar light, the light is absorbed into the solar cell, and particles with protons and electrons are generated inside the semiconductor because of the energy contained in the absorbed solar light. While these move freely inside the solar cell, electrons (-) are gathered toward the N-type semiconductor, and protons (+) are gathered toward the P-type semiconductor, resulting in electric potential. For this reason, electricity flows as load such as bulb and motor is connected to the pole at the front or rear side. This is the principle of photovoltaic power generation based on the PN junction of solar cells.