Lifespan is approximately 20 years.
A solar cell is a device that reacts to light and converts light energy into electricity. There are many types of materials that can produce photovoltaic effects, such as: monocrystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, copper selenium indium, etc. Their principles of energy production are basically the same. Today, crystalline silicon is used as an example to describe the photovoltaic power production process. Crystalline P-type silicon is doped with phosphorus to obtain N-type silicon, forming a P-N junction.
The main principle of photovoltaic power generation is the photoelectric effect of semiconductors. When a photon irradiates a metal, all of its energy can be absorbed by an electron in the metal. The energy absorbed by the electron is large enough toovercome the internal gravity of the metal to perform work, escape from the metal surface and become. photoelectrons.
Silicon atoms have 4 outer electrons. If atoms with 5 outer electrons, such as phosphorus atoms, are doped with pure silicon, they become an N-type semiconductor; if 3 atoms are doped with pure silicon, the atoms; with external electrons, such as boron atoms, form a P-type semiconductor. When P and N types are combined, a potential difference is formed at the contact surface, becoming a solar cell. When sunlight hits the P-N junction, current flows from the P-type side to the N-type side, forming an electric current.
After the polycrystalline silicon is cast, broken and sliced, it is transformed into silicon wafers to be processed. Traces of boron, phosphorus, etc. are doped and diffused onto the silicon wafer to form.
TheBattery slices are arranged and combined into battery components to form a large circuit board. Typically, the component is surrounded by an aluminum frame, the front side is covered with glass, and the back side is installed with electrodes. With battery components and other auxiliary equipment, a power generation system can be formed. In order to convert direct current to alternating current, a power converter must be installed. After producing electricity, it can be stored in batteries or injected into the public network. Battery components account for approximately 50% of the cost of a power generation system, and power converters, installation fees, other ancillary components and other expenses account for the remaining 50%.
After the polycrystalline silicon is cast, broken and sliced, it is transformed into silicon wafers to be processed. Doping anddiffusion of traces of boron, phosphorus, etc. on the silicon wafer form the shape
What are photovoltaic panels used for?
Does photovoltaic radiation affect people?
Almost no.
Photovoltaic panels (solar panels) are devices that use solar energy to convert it into electrical energy. Its working principle is to use solar cells to convert sunlight into direct current, and then convert direct current to alternating current through an inverter for power supply. Photovoltaic panels differ from other household appliances in that they do not themselves produce electromagnetic radiation. Therefore, installing photovoltaic panels on the roof does not pose any radiation risk to the human body.
However, in photovoltaic energy production systems, invertersers and other electrical equipment can produce some degree of electromagnetic radiation. These radiations are generally very weak and will not cause any harm to the human body if installed and used in accordance with current regulations and standards.
It is recommended when installing a photovoltaic power generation system to choose equipment that meets national and industry standards and install it in accordance with regulations to ensure human safety .
In addition, when using photovoltaic power generation systems, it is necessary to regularly inspect and maintain the equipment to ensure its proper operation, thereby reducing the risk of radiation.
In general, if the photovoltaic power generation system is installed and operated correctly, the risk of humans being exposed to electromagnetic radiation is low.
He ist used to produce electricity.
1. Photovoltaic panels extract silicon from raw material sand, then use the silicon raw materials to make silicon wafers one by one throughout the production process, and then connect the silicon wafers in series to make solar cells. . In the photovoltaic panel cell, in the original silicon raw material, atoms (phosphorus atoms) will be injected to form an N-shaped semiconductor, and then atoms (boron atoms) will be injected to form an P-shaped semiconductor. When P and N semiconductors combine, they touch the surface, forming a potential difference, which we call a PN junction. When sunlight hits the PN junction, holes move from the P pole region to the N pole region, and electrons move from the N pole region to the P pole region, foring an electric current.
1. Sunlight forms new hole-electron pairs on the p-n junction of the semiconductor. Under the action of the electric field of the p-n junction, the holes flow from the p region to the n region and the electrons flow from the n region to the p region. Once the circuit is turned on, a current is formed. This is how photovoltaic solar cells work. Solar power generation There are two methods of solar power generation, one is photothermoelectric conversion method and the other is direct photoelectric conversion method.
2. The photothermoelectric conversion method uses solar radiation to produce electricity. Typically, a solar collector converts absorbed heat into steam of a working fluid, which then drives a steam turbine to produce electricity. The first is a photothermal conversion process; the second proThis is a thermoelectric conversion process. The direct photoelectric conversion method uses the photoelectric effect to directly convert solar radiation energy into electrical energy. The basic device for photoelectric conversion is the solar cell. A solar cell is a device that uses the photovoltaic effect to directly convert solar energy into electrical energy. It is a semiconductor photodiode. When the sun shines on the photodiode, it converts the sun's energy into electrical energy and generates electric current. When many cells are connected in series or parallel, a square solar cell array with relatively large output power can be formed.
3. The photoelectric conversion efficiency of monocrystalline silicon solar panels is about 15% and can reach up to 24%. This one presents the pho conversion efficiencythe highest toelectricity of all types of solar panels, but is too expensive to produce for widespread use. to use. Since monocrystalline silicon is usually encapsulated in tempered glass and waterproof resin, it is durable and has a lifespan of up to 15 years or up to 25 years.