太阳能电池百科名片（Solar battery Encyclopedia）.docVIP

太阳能电池百科名片（Solar battery Encyclopedia） Solar battery, encyclopedia, business card,.Txt Solar battery Encyclopedia A solar cell is a device that converts light energy into electrical energy by photoelectric or photochemical effects. The thin-film solar cells, which operate with photovoltaic effects, are still in the embryonic stage, while wet - type solar cells operating with photochemical effects are still in the embryonic stage. The principle of solar cells The solar radiation on the semiconductor p-n junction forms a new hole electron pair. Under the action of the p-n junction electric field, the hole flows from the N region to the p region, and the electrons flow from the p region to the N region, and the current is formed after the circuit is connected. Thats how the photovoltaic effect works. There are two ways of solar power generation, one is the light heat electricity conversion mode, and the other is the direct conversion method of light electricity. (1) the light heat electricity conversion mode uses the heat energy produced by solar radiation to generate electricity, which is usually converted from the heat energy absorbed into the working medium by the solar collector, and then driven by the steam turbine to generate electricity. A process before it is light - heat transfer process; after a process of heat - electricity conversion process, as with an ordinary power. Solar thermal power generation is very low efficiency and high cost, estimated at least its investment than the average power station cost 5 ~ 10 times a 1000MW of the sun. Thermal power stations need to invest 20 to 2 billion 500 million U.S. dollars, the average 1kW of investment from 2000 to $2500. Therefore, at present it can only be applied to special occasions on a small scale, while large-scale utilization is uneconomical in economy and can not compete with ordinary thermal power stations or nuclear power plants. (2) the direct conversion mode of light to electricity is the use of photo