solar cells/solar world panels/best solar prices

Single solar cells can not be used directly to power. Power supply must be a number of single battery strings, connected in parallel and tightly packaged into components. Solar  panels (also known as solar modules) are the core of solar power  systems and the most important part of solar power systems.

The sun is  irradiated on the semiconductor p-n junction to form a new hole-electron  pair. Under the action of the p-n junction electric field, the holes  flow from the p region to the n region. The electrons flow from the n  region to the p region, and the current is formed after the circuit is  turned on. This is the photoelectric effect of the working principle of solar cells.

Solar power  generation There are two ways of solar power generation, one is the  light - heat - electricity conversion mode, the other is the optical -  electrical direct conversion.

(1) light - heat  - electric conversion method through the use of solar radiation  generated by thermal energy, usually by the solar collector will absorb  the heat into the refrigerant refrigerant, and then drive the turbine  power generation. The previous process is the light-heat conversion process; the latter process is the thermo-electrical conversion process.

(2) optical - electrical  direct conversion method is the use of photoelectric effect, the solar  radiation can be directly converted into electrical energy, optical -  electrical conversion of the basic device is the solar cell. The  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 the photodiode, the photodiode turns  the solar energy into electricity. Current. When many batteries in series or in parallel can become a relatively large output power of the solar cell array.

At present,  crystalline silicon materials (including polysilicon and monocrystalline  silicon) is the most important photovoltaic material, its market share  of more than 90%, and in the future for a long period of time is still  the mainstream of solar cells. Polysilicon material  production technology has long been in the United States, Japan, Germany  and other three countries 7 companies in the hands of 10 factories, the  formation of technology blockade, the market monopoly situation. The demand for polysilicon is mainly from semiconductors and solar cells. According to the different requirements of purity, divided into electronic and solar level. Among  them, for the electronic grade polysilicon accounted for about 55%,  solar grade polysilicon accounted for 45%, with the rapid development of  photovoltaic industry, solar cell demand for polysilicon growth rate  higher than the development of semiconductor polysilicon, is expected to  2008 solar polysilicon Demand will exceed the electronic grade polysilicon. In  1994 the world's total output of solar cells is only 69MW, and in 2004  was close to 1200MW, in a short period of 10 years increased by 17  times. Experts predict that the solar PV industry will  overtake nuclear power as one of the most important basic energy sources  in the first half of the 21st century.