Polycrystalline thin film solar cells

Polycrystalline thin film cell cadmium sulfide, cadmium telluride polycrystalline thin film cell efficiency is higher than amorphous silicon thin film solar cells, the cost is lower than monocrystalline silicon cells, and it is easy to large-scale production, but because cadmium is highly toxic, will cause serious pollution to the environment, so it is not the most ideal replacement for crystalline silicon solar cells.

The conversion efficiency of gallium arsenide (GaAs) II-V compound battery can reach 28%, and the GaAs compound material has a very ideal optical band gap and high absorption efficiency, strong anti-irradiation ability, and is not sensitive to heat, which is suitable for manufacturing efficient single-junction batteries. However, the price of GaAs materials is not cheap, which largely limits the popularity of GaAs batteries.

Copper indium selenium thin film cell (CIS) is suitable for photoelectric conversion, there is no photodegradation problem, and the conversion efficiency is the same as that of polysilicon. It has the advantages of low price, good performance and simple process, and will become an important direction for the development of solar cells in the future. The only problem is the source of the material, because indium and selenium are relatively rare elements, so the development of such batteries is bound to be limited.