High-efficiency thin-film solar cell provided with up-conversion fluorescent material film and film preparation method thereof

The up-conversion fluorescent powder is prepared by adopting a liquid-phase co-precipitation method and a thermal reaction method, and the up-conversion fluorescent material film is deposited by using a suspension coating film method or metal organic chemical vapor deposition. By adjusting the doping amount of Yb, Er, Tm and other rare-earth elements, the up-conversion fluorescent material can absorb near-infrared light with the wavelength between 800 and 2,000nm and emit visible light, and also can absorb ultraviolet light with the wavelength between 200 and 350nm and emit the visible light. The up-conversion fluorescent material film is applied to silicon-based thin-film solar cells, and the spectral absorption range of the silicon-based thin-film solar cells is widened. The silicon-based thin-film solar cells have the maximum photoelectric conversion efficiency in the visible light range, so the photoelectric conversion efficiency and the stability of the silicon-based thin-film solar cells can be improved by applying the up-conversion fluorescent material.