solar panels classification
(1) single-crystal silicon solar cells
Photoelectric conversion efficiency of silicon solar cells is about 15%, the highest of 24%, which is the highest of all kinds of photoelectric conversion efficiency of solar cells, but a large production costs, so that it can not be universally used. Due to general use of silicon resin, glass and waterproof package, so rugged, life in general up to 15 years up to 25 years.
(2) polycrystalline silicon solar cells
Polycrystalline silicon solar cells with silicon solar cells production process is almost, but the photoelectric conversion efficiency of silicon solar cells will have to reduce a lot of the photoelectric conversion efficiency of about 12 percent (July 1, 2004 Japan Sharp efficiency of 14.8 percent listed The world's highest efficiency silicon solar cells). From the production cost in terms of silicon solar cells are cheaper than some simple materials, to save power consumption, lower overall production costs, and therefore get a lot of development. In addition, polycrystalline silicon solar battery life is also shorter than the silicon solar cells. From the cost, single crystal silicon solar cells is also slightly better.
(3) amorphous silicon solar cells
The new thin-film amorphous silicon solar cells are solar cells appeared in 1976, it monocrystalline and polycrystalline silicon solar cell production method is completely different, the process is greatly simplified, very little silicon material consumption, lower power consumption, its main The advantage is in low light conditions can also generate electricity. But the main problem is the presence of amorphous silicon solar cell conversion efficiency is low, the international advanced level of about 10%, and is not stable enough, with time, the conversion efficiency of decay.
(4) Multi-compound solar cells
Multi-compound solar cells solar cell means not a single element semiconductor material. Wide variety of national studies, yet the majority of industrial production, mainly the following: a) CdS solar cells b) GaAs solar cells c) copper indium selenide solar cells (the new multi-bandgap gradient Cu (In, Ga)Se2 thin-film solar cells)Cu (In, Ga) Se2 is an excellent material to absorb sunlight, with a diverse band gap semiconductor material gradient (between the conduction band and valence band energy difference), you can expand the scope of solar energy absorption spectrum, and to improve the photoelectric conversion efficiency. Based on it can be designed photoelectric conversion efficiency than silicon thin-film solar cells improved thin film solar cells. Photoelectric conversion can reach 18%, and such film solar cells so far found no performance degradation caused by light radiation effect (SWE), its photoelectric conversion efficiency than the commercial thin-film solar panel about 50 to 75%, below the highest level of photoelectric conversion efficiency in the world of thin film solar cells.