Sunlight illuminates the semiconductor p-n junction to form new hole-electron pairs. Under the action of the p-n junction electric field, holes flow from the p-region to the n-region, and electrons flow from the n-region to the p-region. After the circuit is turned on, a current is formed. This is how photoelectric effect solar cells work.
Solar power generation There are two ways of solar power generation, one is the light-heat-electric conversion method, and the other is the light-electric direct conversion method. solar panel
(1) The light-heat-electric conversion method generates electricity by using the thermal energy generated by solar radiation. Generally, the solar collector converts the absorbed thermal energy into the steam of the working medium, and then drives the steam turbine to generate electricity. The former process is a light-thermal conversion process; the latter process is a thermal-electrical conversion process.
(2) The light-to-electricity direct conversion method uses the photoelectric effect to directly convert solar radiation energy into electrical energy. The basic device for light-to-electricity conversion is the solar cell. A solar cell is a device that directly converts sunlight energy into electrical energy due to the photovoltaic effect. It is a semiconductor photodiode. When the sun shines on the photodiode, the photodiode will convert the sun's light energy into electrical energy and generate electricity. current. When many cells are connected in series or in parallel, it can become a solar cell array with relatively large output power.
Thin-film solar cells have relatively high equipment costs, but low consumption and battery costs, but the photoelectric conversion efficiency is more than half that of crystalline silicon cells, but the low-light effect is very good, and it can also generate electricity under ordinary lights, such as calculators on the solar cell.
(3) Cells: The main function is to generate electricity. The mainstream in the power generation market is crystalline silicon solar cells and thin-film solar cells, both of which have their own advantages and disadvantages.
(4) Backplane: function, sealing, insulating, waterproof. Generally, TPT, TPE and other materials must be resistant to aging. Most component manufacturers have a 25-year warranty. Tempered glass and aluminum alloys are generally no problem. The key is whether the backplane and silicone can meet the requirements.
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