Photovoltaic panels for solar power generation can be used for several years
2021-09-15
The service life is about 20 years.
A solar cell is a device that responds to light and converts light energy into electricity. There are many kinds of materials that can produce photovoltaic effect, such as: monocrystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, indium copper selenide and so on. Their power generation principles are basically the same, and the photovoltaic power generation process is described by taking crystalline silicon as an example. P-type crystalline silicon can be doped with phosphorus to obtain N-type silicon to form a P-N junction.
The main principle of photovoltaic power generation is the photoelectric effect of semiconductors. When a photon irradiates a metal, its energy can be completely absorbed by an electron in the metal. The energy absorbed by the electron is large enough to overcome the internal gravity of the metal to do work, escape from the metal surface and become a photoelectron.
A silicon atom has 4 outer electrons. If pure silicon is doped with an atom with 5 outer electrons, such as a phosphorus atom, it becomes an N-type semiconductor; if pure silicon is doped with an atom with 3 outer electrons, such as Boron atoms, forming a P-type semiconductor. When the P-type and N-type are combined, a potential difference is formed at the contact surface, which becomes a solar cell. When sunlight hits the P-N junction, the current flows from the P-type side to the N-type side, forming a current.
After ingot casting, ingot breaking, slicing and other procedures, polycrystalline silicon is made into silicon wafers to be processed. Doping and diffusing trace amounts of boron, phosphorus, etc. on the silicon wafer forms the
The battery cells are arranged and combined into battery components, which form a large circuit board. Generally, an aluminum frame is wrapped around the module, the front is covered with glass, and the electrode is installed on the reverse. With battery components and other auxiliary equipment, a power generation system can be formed. In order to convert direct current to alternating current, a current converter needs to be installed. After power generation, it can be stored in battery or input to the public grid. In the cost of the power generation system, battery components account for about 50%, and current converters, installation fees, other auxiliary components and other expenses account for the other 50%.
After ingot casting, ingot breaking, slicing and other procedures, polycrystalline silicon is made into silicon wafers to be processed. Doping and diffusing trace amounts of boron, phosphorus, etc. on the silicon wafer forms the
