Explanation

Also known as solar cell, it is a device that directly converts solar radiation energy into electrical energy. The solar cell absorbs light energy after being irradiated by human radiation, and forms electrons and holes in the body. The electron holes are effectively separated to the two ends of the cell to form voltage, which is called photovoltage or photovoltaic. If positive and negative electrodes are prepared on both ends of the battery and external loads are connected, the electron holes flow out of the battery to form a current. Most solar cell use photovoltaic effect to generate electricity, except for dye or dyestuffc sensitized cells, whose power generation principle is similar to plant photosynthesis (see dye sensitized solar cell). In practical applications of batteries, in order to improve battery efficiency, sometimes concentrated applications (see concentrated photovoltaic power generation systems) are used. That is, through optical concentrated systems, the solar radiation intensity on the surface of the solar cell is increased to several times or even hundreds of times the conventional human radiation intensity? So as to improve the utilization rate of solar cell materials. So far, people have developed a large number of solar cell with different materials, different structures and different uses. According to the different materials used, it can be divided into crystalline silicon cell, silicon based thin film cell, cadmium telluride thin film cell, copper indium gallium selenium thin film cell, m-v group element based cell, dye or dyestuffc sensitized cell and organic cell. The methods and processes for preparing solar cell materials are very complex. crystal silicon cells mainly use various technologies for preparing semiconductor l) n junctions, while crystal silicon materials are prepared using purification, crystal drawing or ingot casting, slicing and other technologies. Thin film solar cell mainly use various film deposition technologies, including plasma assisted chemical vapor deposition (PECVD), molecular organic chemical vapor deposition (MOCVD), magnetic control injection, thermal evaporation, and various evaporation technologies derived therefrom. solar cell generate direct current. The output current, voltage and power of a single solar cell are relatively small, and the application needs to be met through series parallel connection. solar cell are connected in series and parallel to form components, and many components are connected in series and parallel to form a system. The DC power generated by the system is converted into AC power through the inverter and provided to users.

Classification