What is a photocell?

Photocell is an element that can generate electromotive force under the illumination of light. It is used for photoelectric conversion, photoelectric detection and light energy utilization. People first discovered and applied selenium photocells. Its principle is that selenium generates electrons under the action of light and is collected by the electrode to generate electromotive force. Later, we discovered and applied various semiconductor materials such as silicon photocells and silver sulfide cells. Its principle is that the semiconductor p-n junction generates new electron-hole pairs under the action of light, and the electrons and holes move to both sides of the junction under the action of the electric field of the p-n junction to form an additional potential difference.

Photocells, also called solar cells, directly convert sunlight into electricity. Therefore, the characteristic of photocell is that it can convert a large amount of light energy absorbed by the earth from solar radiation into electrical energy.

Photovoltaic power generation is a technology that uses the photovoltaic effect of semiconductor pn junction to directly convert light energy into electrical energy. The key element of this technology is solar cell. The solar cells can be packaged and protected in series to form a large-area solar cell module, and then combined with power controller and other components to form a photovoltaic power generation device.

Photovoltaic power generation equipment is extremely refined, reliable, stable, long life, and easy to install and maintain. Monocrystalline silicon battery has high conversion efficiency and good stability, but high cost; Amorphous silicon solar cells have high production efficiency and low cost, but the conversion efficiency is low, and the efficiency decay is severe; Cast polysilicon solar cells have stable conversion efficiency and the highest performance-price ratio; Thin film crystalline silicon solar cells can only be in the research and development stage.

Photovoltaic power generation products are mainly used in three aspects: first, to provide power for non-electric field integration, mainly to provide power for the living and production of residents in non-electric areas, as well as microwave relay power supply, communication power supply, etc. In addition, it also includes some mobile power supply and standby power supply; Second, solar daily electronic products, such as various solar chargers, solar street lamps and solar lawn lamps; Third, grid-connected power generation has been widely implemented in developed countries.



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