Gigawatt (GW) Unit of installed capacity. TW is terawatt, 1 terawatt is equal to 1,000 GW (gigawatt), 1 gigawatt is equal to 1,000 MW (megawatt), 1 megawatt is equal to 1,000 KW (kilowatt), 1 kilowatt is equal to 1,000 W (watt ), 1 watt is equal to 1000 mW (milliwatt), 1 milliwatt is equal to 1000uW (microwatt).
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 and escape. the metal surface and become photoelectrons. Silicon atoms have 4 outer electrons, if atoms with 5 outer electrons, like phosphorus atoms, are doped with pure silicon, it becomes an N-type semiconductor.
If Atoms with three outer electrons, such as boron atoms, are doped with pure silicon, a P-type semiconductor is formed. When the typesWhen P and N are combined, a potential difference is formed at the contact surface, thus becoming a solar cell. When sunlight irradiates the PN junction, the holes move from the N pole region to the P pole region, and the electrons move from the P pole region to the N pole region, forming an electric current.
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When there is light (that there is (e.g. sunlight or other light sources). (Light generated by the body), the battery absorbs the light energy and there is an accumulation of charges with different signs at the two ends of the battery, that is, a "photovoltage" is generated, which is the “photovoltaic effect”.
Under the action of the photovoltaic effect, the two ends of the solar cell generate electromotive force and convert light energy into electrical energy. Solar cellsres are generally silicon cells, which are divided into three types: monocrystalline silicon solar cells, polycrystalline silicon solar cells, and amorphous silicon solar cells.
Thin film photovoltaic cells have the advantages of being thin, light and flexible. They have a wide range of applications and are particularly suitable for use in the integration of photovoltaic buildings. If the efficiency of thin-film solar modules is almost the same as that of crystalline silicon cells, their value for money will be unprecedented. Thin film batteries prepared on flexible substrates have the advantages of being rollable and foldable, not afraid of falling, light weight and good performance in low light, and will have wider application prospects in the future. 'future.
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