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Principle of photovoltaic power generation

Photovoltaic power generation is a technology that directly converts light energy into electrical energy by utilizing the photovoltaic effect of the semiconductor interface. It is mainly composed of three parts: solar panel (component), controller and inverter. The main components are composed of electronic components. The solar cells are packaged and protected in series to form a large-area solar cell module, Steel Square Tube Manufacturers and then combined with a power controller and the like to form a photovoltaic power generation device.

Principle of photovoltaic power generation

Principle of photovoltaic power generation´╝Ü

The main principle of photovoltaic power generation is the photoelectric effect of semiconductors. When a photon is irradiated onto a metal, its energy can be completely absorbed by some electron in the metal. The energy absorbed by the electron is large enough to overcome the internal gravity of the metal and escape from the metal surface to become photoelectron. A silicon atom has four outer electrons. If five atoms of outer electrons such as phosphorus atoms are doped into pure silicon, they become N-type semiconductors; if pure silicon is doped with three outer electrons, such as A boron atom forms a P-type semiconductor. When the P-type and the N-type are combined, the contact surface forms a potential difference and becomes a solar cell. When the sunlight hits the P-N junction, the holes move from the P-pole region to the N-pole region, and the electrons move from the N-pole region to the P-pole region to form a current.

The photoelectric effect is a phenomenon in which light causes a potential difference between a different semiconductor or a semiconductor and a metal to be bonded to different parts. It is first the process of converting photons (light waves) into electrons and converting light energy into electrical energy; secondly, it is the process of forming voltage.

After the polycrystalline silicon is ingot, broken ingot, sliced, etc., it is made into a silicon wafer to be processed. A P-N junction is formed by doping and diffusing a trace amount of boron, phosphorus, or the like on the silicon wafer. Then, by screen printing, the fine silver paste is printed on the silicon wafer to form a grid line, which is sintered and simultaneously formed into a back electrode, and an anti-reflection coating is applied on the surface of the gate line, and the battery sheet is Made to date. The cell array is assembled into a battery pack to form a large circuit board. Generally, an aluminum frame is wrapped around the assembly, the front side is covered with glass, and the opposite side is mounted with electrodes. With battery components and other ancillary equipment, you can form a power generation system. In order to convert direct current to alternating current, a current converter is required. After power generation, it can be stored in battery or input to the public power grid. In the cost of power generation systems, battery components account for about 50%, current converters, installation costs, other auxiliary components, and other expenses account for another 50%.

From the perspective of the world and from a certain country, conventional energy sources are very limited. Solar energy is an inexhaustible source of renewable energy for human beings. It has sufficient cleanliness, absolute safety, relative extensiveness, long life and maintenance-free, resource sufficiency and potential economics. Other advantages have an important position in the long-term energy strategy.

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