Thin-film solar cells

At present, crystalline silicon solar cells have been widely used solar cells occupy the main market. However, crystal now widely used crystalline silicon solar cells, solar cells occupy the main market. However, crystalline silicon solar cells inherent weaknesses: silicon materials, band gap Eg = 1.12eV, solar photovoltaic conversion efficiency is relatively low grounds; silicon material is an indirect band material, in the visible range, the light absorption coefficient of silicon is far much lower than the other Solar photovoltaic material, such as the same 95% of the sunlight absorption, GaAs solar cells need only 5 to 10 microns thick, while the silicon solar cells requires more than 150 microns thickness; so, in the preparation of crystalline silicon solar cells, the silicon thickness of 150 ~ 200 microns or more can effectively absorb the solar energy; crystalline silicon material to go through several purification, the relatively high cost; silicon solar cell size is relatively small, if the composition of photovoltaic systems, use dozens of the same silicon solar the battery connected, resulting in a higher cost of the system. Therefore, the thin-film solar cells has aroused people's interest and a certain degree of industrial applications.



Other Energy Compared to the cost of solar power is relatively high, because the solar energy collected only about 20% can be converted to electricity. This is a comprehensive application of solar energy has become hindered a major challenge. Therefore, how to use anti-reflective coating to reduce solar modules to protect the surface of the amount of light reflected from the glass, this issue has been cause for concern. The technology can increase the amount of sunlight transmission and thus improve power conversion efficiency.