How the Solar Cell Work?

How the Solar Cell Work?

5″ monocrystalline Silicon 5 inch 125 Series Solar Cell

6″ Polycrystalline Silicon 6 inch 156 Series Solar Cell

Sunlight in the semiconductor pn junction to form a new hole – electron pairs in the pn junction electric field, the hole flow from the p-n area, the flow of electrons from p-n area, connected to the circuit after the formation of current. This is the photovoltaic solar cell works.

Solar power generation solar power in two ways, one is light – heat – electricity conversion, and the other is light – electric direct conversion.

Light – heat – electricity conversion
(1) – thermal – electrical conversion of solar radiation through the use of the heat energy produced, usually by the solar collectors to convert the heat absorbed by refrigerant vapor then drives turbines to generate electricity. The former is a process – thermal conversion process; after a process of heat – electricity conversion process, as with ordinary thermal power. Drawback is that solar thermal power generation efficiency is low and the cost is high, estimated at least its investment than the average fire 5 to 10 times your power. a 1000MW of solar thermal power plants need to invest in 20 to 25 billion U.S. dollars, the average investment for the 1kW 2000 to 2500 U.S. dollars. Therefore, it is only used in small-scale special occasions, and large-scale use in the economy is very uneconomical, but also not with the ordinary power plant or nuclear power plants to compete.

Light – electricity direct conversion
(2) Optical – Electric Direct conversion method is the use of the photoelectric effect, the direct conversion of solar radiation into electrical energy, light – the basic device is the electrical conversion of solar cells. Solar cell is a kind of photovoltaic effect and because the solar energy directly into electrical energy device, a semiconductor photodiode, when the sun light to the photodiode, the photodiode will be the sun’s light energy into electrical energy, resulting in current. When the number of batteries together in series or parallel can be a relatively large solar power output of the square. Solar cell is a promising new type of power supply, with a permanent, clean and flexible three major advantages. Solar battery life, as long as there is sun, solar battery to be an investment in long-term use; and thermal power, nuclear power compared to solar cells will not cause environmental pollution; solar cells can be both medium and small and large to medium-sized million-kilowatt power station, only a small use of solar battery, which is unmatched by other power