Now researchers are trying to make solar cells using Fe-based materials such as iron silicide (B-FeSi, band gap 08V) and pyrite (FeS, band gap 0.95ev). So far, no practical reports on the use of iron-silicon compounds for solar cells have been reported. The current research hotspots are still concentrated on pyrite. In May 2009, Swiss automakers developed the Quanta, which was eye-catching for its pyrite solar cells. The material of the pyrite solar cell, pyrite is a gold ore. The reason for the appearance of gold is mainly due to its absorption coefficient of 6x10cm, absorbed by strong light, and its absorption and migration is 1~2.5eV. This strong absorption, the top of the valence band and the bottom of the conduction band come from the 3d electron orbit of the iron with a narrow bandwidth, resulting in a high density state. For this reason, the film thickness can be about 20mm. It is sandwiched between p-type and n-type of wide-bandgap semiconductors. By this special structure, a special effect, photoelectric effect, is formed, thus forming a solar cell-dye-sensitized battery. There is an unclear report that the conversion efficiency of the concentrating pyrite solar cell can reach 50%, but the cost is also very high.