Sun light shines on the p-n junction of the semiconductor to form a new hole-electron pair. 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, current is formed. This is the working principle of the photoelectric effect solar cell.
Solar power generation There are two methods for solar power generation. One is the light-heat-electric conversion method, and the other is the light-electricity direct conversion method.
(1) The light-heat-electricity conversion method generates electricity by utilizing heat energy generated by solar radiation. Generally, a solar collector converts the absorbed thermal energy into vapor of the working fluid, and then drives the turbine to generate electricity. The former process is a photo-thermal conversion process; the latter process is a thermal-electric conversion process.
(2) Optical-electrical direct conversion is the use of photoelectric effect, the solar radiation can be directly converted into electrical energy, light-electrical conversion of the basic device is a solar cell. A solar cell is a device that converts solar energy directly into electrical energy due to the photovoltaic effect. It is a semiconductor photodiode. When the sun shines on a photodiode, the photodiode turns the light energy of the sun into electricity. Current. When many batteries are connected in series or in parallel, they can become a solar cell array with relatively large output power.