Solar power principle

Natural sunlight irradiation in the semiconductor device p-n junction, resulting in a new cavitation - electron pairs, in the p-n junction under the action of the electric field, cavitation from the n area into the p area, electronic components from the p area into the n area, connected to the circuit will result in the total flow of electricity. This is the photoelectric effect solar cells work on the principle. Solar power plant way solar power plant there are two ways, one is the light - heat - electricity conversion method, the other is the light - electricity immediately conversion method.

(1) Light-heat-electricity conversion method based on the application of solar radiation intensity leads to the power generation capacity of electric energy, generally by the solar power plant collector will be digested by the power energy converted into material vapor, and then controller turbine power generation capacity. The former whole process is the whole process of light-heat conversion; the latter whole process is the whole process of heat-electricity conversion.

(2) Light-electricity conversion immediately is the application of photoelectric effect, the intensity of solar radiation can be immediately converted into electrical energy, light-electricity conversion of the basic machinery and equipment is solar cells. Solar cell is a photovoltaic amperometric effect due to the solar energy immediately converted into electrical energy electronic devices, is a semiconductor device photodiode, when the natural light sunlight irradiation to the photodiode at the photodiode, the photodiode will be the natural light energy into electrical energy, resulting in the total flow of electricity. When a number of cells in series or series connection can be changed into a relatively large output power of the solar cell diversion matrix.

Composition and function of solar panels

Polysilicon regulations are important for semiconductor devices and solar cells. According to the different purity requirements, it is categorized into electronic component grade and solar power plant grade. In this, polysilicon used for electronic component grade accounts for about 55%, and solar power station grade polysilicon accounts for 45%.

With the rapid development of the photovoltaic industry, solar cells on the polysilicon demand growth rate higher than the development of semiconductor devices polysilicon tendency, it is expected that by 2008 the demand for solar power station polysilicon will exceed the demand for electronic components grade polysilicon.

In 1995 the world's total value of solar cells was only 69MW, while in 2004 it was close to 1200MW, in just ten years it has increased 17 times. It is predicted that the whole solar power industry chain in the first half of the twenty-first century will exceed the chemical plant to become one of the most important basic energy sources.